Elementary School Science Quiz: Building Shape Models

20 questions · exam conditions

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Building Shape ModelsQuestion 1 of 20

Problem: Books slid off when Maya carried them to the rug. At the building station, Maya and Chen built a tray model from a shallow box. Materials: shallow box, cardboard strips, tape. Shape features: they added raised edges on all four sides. They tested it by putting books on the tray and walking. The books stayed on the tray and did not slide off. The edges acted like walls to keep items in. The model showed the shape helps the tray work. How did the edges help when they tested it?

The edges let the books slide off faster.

The raised edges kept the books from falling off.

The tape made the tray heavier than before.

The tray worked because they used a box.

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Elementary School Science Quiz

Elementary School Science Quiz: Building Shape Models

Practice Building Shape Models in Elementary School Science with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Building Shape Models, giving you a quick way to practice the rules, question types, and explanations that matter most for Elementary School Science.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

The edges let the books slide off faster.
The raised edges kept the books from falling off. (correct answer)
The tape made the tray heavier than before.
The tray worked because they used a box.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, books slid off when Maya carried them to the rug, so Maya and Chen built a tray with raised edges to keep them in place. They built the model using a shallow box, cardboard strips, and tape and shaped it to have raised edges on all four sides. When they tested it, they put books on the tray and walked, and the books stayed on without sliding off. Choice B is correct because it accurately identifies the shape feature of raised edges and correctly connects to the observed function of keeping books from falling off, including evidence from the demonstration where the edges acted like walls during walking. For example, the raised edges formed barriers and when books were carried on the tray around the classroom the edges prevented them from sliding off. Choice A represents wrong function attributed. This error typically occurs when students notice materials but not shape, describe process instead of function, focus on non-functional aspects, describe shape generally without connecting to how it works, don't connect model testing results to shape's role, think decorative and functional features are equally important, confuse what different shapes do. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 2

Problem: Books slid off when Chen carried them to the rug. Materials: a shallow cereal box, cardboard strips, tape. Chen and Sofia built a model tray by taping cardboard strips around the edges. Shape features: raised edges on all four sides. They tested it by putting three books on the tray and walking slowly. The books stayed on the tray and did not slide off. The model showed the edges help it work.
How did the raised edges help when they tested it?

The raised edges kept the books from sliding off. (correct answer)
The cardboard made the books lighter to carry.
The tape made the tray look shiny and new.
The tray worked because they cut the box first.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, books slid off when Chen carried them to the rug, so Chen and Sofia built a tray by taping cardboard strips around the edges of a shallow cereal box; they built the model using a shallow cereal box, cardboard strips, and tape and shaped it to have raised edges on all four sides. When they tested it, they put three books on the tray and walked slowly, and the books stayed on the tray and did not slide off. Choice A is correct because it accurately identifies the shape feature of raised edges, correctly connects to the observed function of keeping books from sliding off, and includes evidence from the demonstration where books stayed on during walking. For example, the raised edges formed barriers and when the tray was carried the edges prevented the books from sliding off. Choice B represents an error focusing on material instead of shape function, such as thinking cardboard makes books lighter rather than edges containing them. This error typically occurs when students notice materials but not shape, describe process instead of function, or don't connect model testing results to shape's role. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 3

Problem: Water spilled when Carlos poured into a small bottle. At the building station, Carlos and Keisha built a funnel model from paper. Materials: paper, tape, bottle, cup of water. Shape features: the funnel was a cone with a wide top and narrow bottom. They tested it by holding the narrow bottom over the bottle. Then they poured water into the wide top. The water went into the bottle with less spilling. The model showed the shape guides water where it should go. Which shape feature makes the model work to solve the problem?

The wide top and narrow bottom guide water into the bottle. (correct answer)
The paper works because it is white.
The funnel works because they poured slowly.
The tape works because it holds the paper together.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, water spilled when Carlos poured into a small bottle, so Carlos and Keisha built a funnel with a wide top narrowing to a point to guide the water. They built the model using paper, tape, a bottle, and a cup of water and shaped it to have a cone with wide top and narrow bottom. When they tested it, they poured water into the wide top over the bottle and it went in with less spilling. Choice A is correct because it accurately identifies the shape feature of wide top and narrow bottom and correctly connects to the observed function of guiding water into the bottle, including evidence from the demonstration where water flowed without much spill. For example, the wide top narrowing to point directed the water and when poured, it entered the bottle as shown in testing. Choice B represents aesthetic reasoning. This error typically occurs when students notice materials but not shape, describe process instead of function, focus on non-functional aspects, describe shape generally without connecting to how it works, don't connect model testing results to shape's role, think decorative and functional features are equally important, confuse what different shapes do. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 4

Problem: Markers kept rolling off the table. During engineering time, Jamal and Sofia built a holder model from cardboard and tape. Materials: cardboard, tape, scissors, markers. Shape features: they cut three round openings in a flat cardboard strip. They put each marker into a round opening to test it. When they tilted the holder a little, the markers stayed in place. The openings held the round markers so they did not roll away. The model showed the shape helps the holder work. Which part of the model's shape is important for solving the problem?

The round openings hold markers so they do not roll away. (correct answer)
The tape is sticky so the markers cannot move.
They cut the cardboard carefully to make it fast.
The holder is colorful so it looks nice on the table.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, markers kept rolling off the table, so Jamal and Sofia built a holder with round openings to keep them in place. They built the model using cardboard, tape, scissors, and markers and shaped it to have three round openings in a flat cardboard strip. When they tested it, they put each marker into a round opening and tilted the holder a little, but the markers stayed in place. Choice A is correct because it accurately identifies the shape feature of round openings and correctly connects to the observed function of holding markers so they do not roll away, including evidence from the demonstration where the openings held the round markers during tilting. For example, the round openings matched the markers' shape and when tilted the holder, the markers did not roll away as shown in testing. Choice B represents a material focus instead of shape function. This error typically occurs when students notice materials but not shape, describe process instead of function, focus on non-functional aspects, describe shape generally without connecting to how it works, don't connect model testing results to shape's role, think decorative and functional features are equally important, confuse what different shapes do. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 5

The wide top and narrow bottom guide water into the bottle. (correct answer)
The paper works because it is white.
The funnel works because they poured slowly.
The tape works because it holds the paper together.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, water spilled when Carlos poured into a small bottle, so Carlos and Keisha built a funnel with a wide top narrowing to a point to guide the water. They built the model using paper, tape, a bottle, and a cup of water and shaped it to have a cone with wide top and narrow bottom. When they tested it, they poured water into the wide top over the bottle and it went in with less spilling. Choice A is correct because it accurately identifies the shape feature of wide top and narrow bottom and correctly connects to the observed function of guiding water into the bottle, including evidence from the demonstration where water flowed without much spill. For example, the wide top narrowing to point directed the water and when poured, it entered the bottle as shown in testing. Choice B represents aesthetic reasoning. This error typically occurs when students notice materials but not shape, describe process instead of function, focus on non-functional aspects, describe shape generally without connecting to how it works, don't connect model testing results to shape's role, think decorative and functional features are equally important, confuse what different shapes do. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 6

Problem: Amir could not reach the top shelf for tissues. Materials: sturdy boxes, blocks, a flat piece of cardboard, tape. Amir and Maya built a model platform by stacking boxes and putting a flat cardboard top on it. Shape features: a flat top surface and a wide base. They tested it by standing on the flat top and reaching again. Amir could reach higher than before. The model showed the flat top helps.
What shape feature helps the model work?

The flat top surface lets Amir stand to reach higher. (correct answer)
The tape color helps Amir find the platform quickly.
The boxes are light, so the shelf is easier to reach.
Drawing a plan first is what makes it reach higher.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, Amir could not reach the top shelf for tissues, so Amir and Maya built a platform by stacking sturdy boxes and blocks with a flat cardboard top; they built the model using sturdy boxes, blocks, a flat piece of cardboard, and tape and shaped it to have a flat top surface and a wide base. When they tested it, they stood on the flat top and reached again, and Amir could reach higher than before. Choice A is correct because it accurately identifies the shape feature of the flat top surface, correctly connects to the observed function of letting Amir stand to reach higher, and includes evidence from the demonstration where standing on it allowed reaching the shelf. For example, the flat top provided a stable surface and when stood on it helped reach items that were too high before. Choice B represents a decorative focus instead of shape function, such as thinking tape color helps find it rather than the flat top supporting standing. This error typically occurs when students focus on non-functional aspects, think decorative and functional features are equally important, or ignore evidence from testing. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 7

Problem: Carlos could not reach the class calendar. Materials: blocks, a sturdy box, a flat book cover, tape. Carlos and Emma built a model platform by stacking blocks and adding a flat top. Shape features: a flat top surface to stand on. They tested it by standing on the flat top and pointing to the calendar. Carlos could reach it without jumping. The model showed the flat top helps reach.
What did building the model show about the solution?

A flat top surface lets you stand and reach higher. (correct answer)
Tape is the best material for reaching high things.
Drawing the calendar bigger makes it easier to reach.
Blocks work because they are colorful and fun.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, Carlos could not reach the class calendar, so Carlos and Emma built a platform by stacking blocks and adding a flat book cover top; they built the model using blocks, a sturdy box, a flat book cover, and tape and shaped it to have a flat top surface to stand on. When they tested it, they stood on the flat top and pointed to the calendar, and Carlos could reach it without jumping. Choice A is correct because it accurately identifies the shape feature of flat top surface, correctly connects to the observed function of letting you stand and reach higher, and includes evidence from the demonstration where standing on it allowed reaching the calendar. For example, the flat top provided support and during testing helped reach without jumping. Choice B represents an error focusing on material instead of shape function, such as thinking tape is best for reaching rather than the flat top supporting. This error typically occurs when students notice materials but not shape, describe process instead of function, or don't connect model testing results to shape's role. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 8

Problem: Pencils and erasers got mixed up in one bin. In the classroom makerspace, Emma and Amir built a divider box model from a shoebox. Materials: shoebox, cardboard strips, tape. Shape features: they taped dividers inside to make three sections. They tested it by putting pencils in one section and erasers in another. Then they shook the box gently. The items stayed in their own sections and did not mix. The model showed the shape helps the box work. What does the model show about how shape helps it work?

The dividers make sections that keep items separated. (correct answer)
The box works because cardboard is strong.
The box works because they used scissors.
The sections are best because they look neat.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, pencils and erasers got mixed up in one bin, so Emma and Amir built a box with cardboard dividers to keep them separated. They built the model using a shoebox, cardboard strips, and tape and shaped it to have dividers creating three sections. When they tested it, they placed pencils in one section and erasers in another, shook the box gently, and the items stayed separated. Choice A is correct because it accurately identifies the shape feature of dividers and correctly connects to the observed function of making sections that keep items separated, including evidence from the demonstration where items did not mix during shaking. For example, the dividers created separate compartments and when supplies were placed in different sections they stayed separated during the test. Choice B represents material focus instead of shape function. This error typically occurs when students notice materials but not shape, describe process instead of function, focus on non-functional aspects, describe shape generally without connecting to how it works, don't connect model testing results to shape's role, think decorative and functional features are equally important, confuse what different shapes do. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 9

Problem: Yuki could not reach the paper towels on a high shelf. During engineering time, Yuki and Marcus built a platform model using blocks and a flat cardboard top. Materials: blocks, small boxes, cardboard, tape. Shape features: the top was flat and raised about 6 inches. They tested it by placing the platform near the shelf and standing on the flat top. Yuki could reach the paper towels now. The flat raised surface helped her stand safely. The model showed the shape helps the platform work. How does the shape of the model solve the problem?

The flat raised top lets Yuki stand higher to reach. (correct answer)
The tape solves it because tape is sticky.
The platform solves it because it is a new idea.
The blocks solve it because they are different colors.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, Yuki could not reach the paper towels on a high shelf, so Yuki and Marcus built a platform with a flat raised top to stand higher. They built the model using blocks, small boxes, cardboard, and tape and shaped it to have a flat top raised about 6 inches. When they tested it, they stood on the flat top near the shelf and Yuki could reach the paper towels. Choice A is correct because it accurately identifies the shape feature of the flat raised top and correctly connects to the observed function of letting Yuki stand higher to reach, including evidence from the demonstration where the surface provided stable support. For example, the flat top surface provided a stable platform and when student stood on it they could reach items that were too high before. Choice B represents material focus instead of shape function. This error typically occurs when students notice materials but not shape, describe process instead of function, focus on non-functional aspects, describe shape generally without connecting to how it works, don't connect model testing results to shape's role, think decorative and functional features are equally important, confuse what different shapes do. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 10

Problem: Crayons and glue sticks got mixed in one bin. During makerspace time, Chen and Emma built a divider box model from a cereal box. Materials: cereal box, cardboard strips, tape. Shape features: they made four compartments with dividers. They tested it by putting crayons in one compartment and glue sticks in another. Then they picked up the box and moved it. The items stayed in their own compartments. The model showed the dividers help it work. Why did they build the dividers?

To make separate sections so items do not mix. (correct answer)
To use more tape and make it shiny.
To make the box heavier than the old bin.
To make the box look like a present.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, crayons and glue sticks got mixed in one bin, so Chen and Emma built a box with dividers to make separate sections. They built the model using a cereal box, cardboard strips, and tape and shaped it to have four compartments with dividers. When they tested it, they put crayons in one compartment and glue sticks in another, moved the box, and items stayed separated. Choice A is correct because it accurately identifies the shape feature of dividers and correctly connects to the observed function of making separate sections so items do not mix, including evidence from the demonstration where items stayed in compartments during movement. For example, the dividers created separate compartments and when supplies were placed in different sections they stayed separated during the test. Choice B represents material focus instead of shape function. This error typically occurs when students notice materials but not shape, describe process instead of function, focus on non-functional aspects, describe shape generally without connecting to how it works, don't connect model testing results to shape's role, think decorative and functional features are equally important, confuse what different shapes do. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 11

Problem: Round balls rolled away during clean-up. In engineering time, Marcus and Jamal built a barrier model from blocks. Materials: blocks, tape, small balls. Shape features: they made a U-shaped wall with three sides. They tested it by putting balls inside the U-shape. Then they tilted the table a little. The balls stayed behind the walls and did not roll away. The model showed the walls stop rolling. What shape feature helps the model work?

The U-shaped walls block the balls so they stay put. (correct answer)
The balls stay because the blocks are heavy.
The model works because they built it quietly.
The model works because the balls are colorful.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, round balls rolled away during clean-up, so Marcus and Jamal built a barrier with U-shaped walls to block them. They built the model using blocks, tape, and small balls and shaped it to have a U-shaped wall with three sides. When they tested it, they put balls inside the U-shape, tilted the table, and the balls stayed behind the walls. Choice A is correct because it accurately identifies the shape feature of U-shaped walls and correctly connects to the observed function of blocking balls so they stay put, including evidence from the demonstration where walls stopped rolling during tilting. For example, the U-shaped walls formed barriers and when balls were placed inside and table tilted the balls didn't roll out. Choice B represents material focus instead of shape function. This error typically occurs when students notice materials but not shape, describe process instead of function, focus on non-functional aspects, describe shape generally without connecting to how it works, don't connect model testing results to shape's role, think decorative and functional features are equally important, confuse what different shapes do. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 12

Problem: Small toys were hard to store on one table. In a design project, Sofia and Amir built a shelf model from small boxes. Materials: small boxes, cardboard, tape. Shape features: they made two horizontal levels like shelves. They tested it by putting toys on the top level and bottom level. More toys fit in the same space than before. The flat levels made extra places to store items. The model showed the shape helps the shelf work. What shape feature helps the model work?

The horizontal shelves make more spaces to store toys. (correct answer)
The shelf works because the boxes are small.
The shelf works because they taped it fast.
The shelf works because it is next to the wall.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, small toys were hard to store on one table, so Sofia and Amir built a shelf with horizontal levels to create more storage spaces. They built the model using small boxes, cardboard, and tape and shaped it to have two horizontal levels like shelves. When they tested it, they put toys on the top and bottom levels, and more toys fit in the same space. Choice A is correct because it accurately identifies the shape feature of horizontal shelves and correctly connects to the observed function of making more spaces to store toys, including evidence from the demonstration where extra places held more items. For example, the horizontal shelves created additional flat surfaces and when toys were placed on levels they fit more than before in testing. Choice B represents material focus instead of shape function. This error typically occurs when students notice materials but not shape, describe process instead of function, focus on non-functional aspects, describe shape generally without connecting to how it works, don't connect model testing results to shape's role, think decorative and functional features are equally important, confuse what different shapes do. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 13

Problem: Crayons kept getting mixed up in one box. Materials: a shoebox, cardboard strips, tape. Emma and Jamal built a model divider box by taping cardboard strips inside the shoebox. Shape features: the dividers made four sections. They tested it by putting crayons in different sections and shaking the box gently. The crayons stayed in their own sections and did not mix. The model showed the shape helps organize.
How does the shape of the model solve the problem?

The box is big, so it can hold more crayons.
The dividers make sections that keep crayons separated. (correct answer)
The tape is sticky, so the crayons stay clean.
The lid closes tight, so the colors look brighter.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, crayons kept getting mixed up in one box, so Emma and Jamal built a divider box by taping cardboard strips inside a shoebox; they built the model using a shoebox, cardboard strips, and tape and shaped it to have dividers creating four sections. When they tested it, they put crayons in different sections and shook the box gently, and the crayons stayed in their own sections and did not mix. Choice B is correct because it accurately identifies the shape feature of dividers, correctly connects to the observed function of making sections that keep crayons separated, and includes evidence from the demonstration where crayons stayed separated during shaking. For example, the dividers created separate compartments and when the box was shaken the items stayed in their sections. Choice C represents an error focusing on material instead of shape function, such as thinking tape's stickiness keeps crayons clean rather than dividers separating them. This error typically occurs when students notice materials but not shape, describe process instead of function, or don't connect model testing results to shape's role. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 14

Problem: Ping-pong balls rolled away during cleanup. Materials: a cardboard strip, tape, a small box lid. Jamal and Amir built a model barrier by taping the cardboard strip into a U-shape wall on the lid. Shape features: three walls make a corral. They tested it by rolling a ball toward the wall. The ball hit the wall and stayed inside the U-shape. The model showed walls stop rolling.
How does the shape of the model solve the problem?

The walls block the balls so they don't roll away. (correct answer)
The lid is smooth, so the balls roll faster.
The tape smell tells students where the balls are.
The wall works because they built it quietly.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, ping-pong balls rolled away during cleanup, so Jamal and Amir built a barrier by taping a cardboard strip into a U-shape wall on a small box lid; they built the model using a cardboard strip, tape, and a small box lid and shaped it to have three walls making a corral. When they tested it, they rolled a ball toward the wall, and the ball hit the wall and stayed inside the U-shape. Choice A is correct because it accurately identifies the shape feature of walls, correctly connects to the observed function of blocking balls so they don't roll away, and includes evidence from the demonstration where the ball stayed inside after hitting the wall. For example, the walls formed barriers and when rolled the ball didn't escape. Choice B represents a wrong function attributed, such as thinking the lid makes balls roll faster rather than walls blocking them. This error typically occurs when students confuse what different shapes do, don't connect model testing results to shape's role, or attribute wrong functions. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 15

Problem: Markers kept rolling off the table. Materials: cardboard, tape, paper towel tubes. Marcus and Yuki built a model holder from a flat cardboard base and taped on three short walls. They also taped on two tube rings to make round openings. Shape features: walls and round openings. They tested it by putting markers in the openings and tilting the base a little. The markers stayed in place and did not roll away. The model showed the shape can stop rolling.
Which part of the model's shape is important for solving the problem?

The round openings hold the markers so they don't roll away. (correct answer)
The tape makes the model strong so the markers won't roll.
The bright paper makes the holder look nice on the table.
Cutting the cardboard carefully is what stops the rolling.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, markers kept rolling off the table, so Marcus and Yuki built a holder with a flat cardboard base, three short walls, and two tube rings for round openings; they built the model using cardboard, tape, and paper towel tubes and shaped it to have walls and round openings. When they tested it, they put markers in the openings and tilted the base a little, and the markers stayed in place and did not roll away. Choice A is correct because it accurately identifies the shape feature of round openings, correctly connects to the observed function of holding markers so they don't roll away, and includes evidence from the demonstration where markers stayed in place during tilting. For example, the round openings held the markers securely and when the base was tilted they didn't roll out. Choice B represents an error focusing on material instead of shape function, such as thinking tape's strength stops rolling rather than the openings' shape. This error typically occurs when students notice materials but not shape, describe process instead of function, or don't connect model testing results to shape's role. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 16

Problem: Water spilled when pouring into a small bottle. Materials: paper, tape, a plastic bottle, a cup of water. Yuki and Emma built a model funnel by rolling paper into a cone. Shape features: wide top and narrow bottom. They tested it by holding the narrow bottom over the bottle and pouring water into the wide top. The water went into the bottle with less spilling. The model showed the shape guides water.
Why did they build the wide top and narrow bottom?

It guides the water into the small bottle opening. (correct answer)
It makes the funnel heavier so it won't move.
It makes the paper look like a party hat.
It uses more tape so the water tastes better.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, water spilled when pouring into a small bottle, so Yuki and Emma built a funnel by rolling paper into a cone; they built the model using paper and tape and shaped it to have a wide top narrowing to a point at the bottom. When they tested it, they held the narrow bottom over the bottle and poured water into the wide top, and the water went into the bottle with less spilling. Choice A is correct because it accurately identifies the shape feature of wide top and narrow bottom, correctly connects to the observed function of guiding water into the small bottle opening, and includes evidence from the demonstration where water flowed in without much spilling. For example, the cone shape directed the water and during pouring it entered the bottle successfully. Choice C represents a decorative focus instead of shape function, such as thinking the paper looks like a party hat rather than the cone guiding water. This error typically occurs when students focus on non-functional aspects, think decorative and functional features are equally important, or ignore evidence from testing. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 17

Problem: The class had no space to store small bins. Materials: small boxes, cardboard, tape. Sofia and Marcus built a model shelf by stacking boxes to make two levels. Shape features: flat horizontal surfaces at different heights. They tested it by placing bins on the top level and the bottom level. They could store more bins than on one table. The model showed the levels help storage.
What does the model show about how shape helps it work?

The two flat levels make more spaces to store bins. (correct answer)
The tape makes the bins smaller so they fit.
The boxes are new, so the shelf works better.
Painting the shelf makes it hold more bins.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, the class had no space to store small bins, so Sofia and Marcus built a shelf by stacking small boxes to make two levels; they built the model using small boxes, cardboard, and tape and shaped it to have flat horizontal surfaces at different heights. When they tested it, they placed bins on the top level and the bottom level, and they could store more bins than on one table. Choice A is correct because it accurately identifies the shape feature of two flat levels, correctly connects to the observed function of making more spaces to store bins, and includes evidence from the demonstration where more bins fit on the levels. For example, the stacked levels provided additional surfaces and during testing allowed storing extra bins. Choice D represents a decorative focus instead of shape function, such as thinking painting makes it hold more rather than levels creating space. This error typically occurs when students focus on non-functional aspects, think decorative and functional features are equally important, or ignore evidence from testing. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 18

Problem: Small toys got mixed together in the art center. Materials: a small box, cardboard strips, tape, scissors. Maya and Chen built a model divider box with three cardboard dividers. Shape features: four compartments in one box. They tested it by putting buttons, erasers, and small cubes in different compartments. They shook the box gently, and the items stayed separated. The model showed compartments help.
Which shape feature makes the model work to solve the problem?

The compartments keep different items from mixing together. (correct answer)
The scissors make straight cuts so the box is pretty.
The cardboard is brown, so it matches the table.
The tape roll is big, so the box holds more.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, small toys got mixed together in the art center, so Maya and Chen built a divider box with three cardboard dividers in a small box; they built the model using a small box, cardboard strips, tape, and scissors and shaped it to have four compartments in one box. When they tested it, they put buttons, erasers, and small cubes in different compartments and shook the box gently, and the items stayed separated. Choice A is correct because it accurately identifies the shape feature of compartments, correctly connects to the observed function of keeping different items from mixing together, and includes evidence from the demonstration where items stayed separated during shaking. For example, the compartments created separate sections and when shaken the toys didn't mix. Choice B represents an error focusing on building process instead of shape function, such as thinking scissors' cuts make it pretty rather than compartments separating. This error typically occurs when students describe process instead of function, focus on non-functional aspects, or don't connect model testing results to shape's role. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 19

Problem: Paper clips slid off when Keisha carried them. At the building station, Keisha and Yuki built a tray model from cardboard. Materials: cardboard, tape, small cup of paper clips. Shape features: they folded up the sides to make raised edges. They tested it by putting paper clips on the tray and walking to the teacher. The clips stayed inside the edges and did not fall. The model showed the edges contain small items. Which part of the model's shape is important for solving the problem?

The raised edges keep the paper clips from sliding off. (correct answer)
The tray works because cardboard is cheap.
The tray works because they used scissors to cut.
The tray works because it is a rectangle shape.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, paper clips slid off when Keisha carried them, so Keisha and Yuki built a tray with raised edges to keep them from sliding. They built the model using cardboard, tape, and a small cup of paper clips and shaped it to have folded up sides making raised edges. When they tested it, they put paper clips on the tray, walked to the teacher, and the clips stayed inside without falling. Choice A is correct because it accurately identifies the shape feature of raised edges and correctly connects to the observed function of keeping paper clips from sliding off, including evidence from the demonstration where edges contained items during walking. For example, the raised edges formed barriers and when items were placed on the tray and carried around the classroom the edges prevented them from sliding off. Choice B represents material focus instead of shape function. This error typically occurs when students notice materials but not shape, describe process instead of function, focus on non-functional aspects, describe shape generally without connecting to how it works, don't connect model testing results to shape's role, think decorative and functional features are equally important, confuse what different shapes do. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.

Question 20

Problem: Amir could not reach the class calendar high up. During a design project, Amir and Maya built a platform model using two sturdy boxes. Materials: two boxes, cardboard, tape. Shape features: they made a flat top surface to stand on. They tested it by standing on the flat top and reaching up. Amir could touch the calendar now. The model showed the flat top helps the platform work. What did building the model show about the solution?

A flat raised surface lets you stand higher to reach. (correct answer)
Using tape always makes reaching easier.
Boxes work best when they are the same color.
Standing near the wall makes you reach higher.

Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, Amir could not reach the class calendar high up, so Amir and Maya built a platform with a flat raised surface to stand higher. They built the model using two sturdy boxes, cardboard, and tape and shaped it to have a flat top surface to stand on. When they tested it, they stood on the flat top and Amir could touch the calendar. Choice A is correct because it accurately identifies the shape feature of flat raised surface and correctly connects to the observed function of letting you stand higher to reach, including evidence from the demonstration where the surface allowed reaching higher items. For example, the flat raised surface provided a stable platform and when student stood on it they could reach items that were too high before. Choice B represents material focus instead of shape function. This error typically occurs when students notice materials but not shape, describe process instead of function, focus on non-functional aspects, describe shape generally without connecting to how it works, don't connect model testing results to shape's role, think decorative and functional features are equally important, confuse what different shapes do. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.