Limits on Materials, Time, and Cost
Help Questions
3rd Grade Science › Limits on Materials, Time, and Cost
Look at the water filter project description. Design a filter to remove dirt from dirty water. Students can use only coffee filters, sand, gravel, and plastic bottles, and must finish during a 40-minute science period. They must use items the teacher already has and cannot go shopping. According to the description, what limits how students can solve this problem?
Only coffee filters, sand, gravel, and plastic bottles, finish in 40 minutes, and spend $0.
The problem is that the water has dirt mixed into it.
Use soap and a metal strainer, and take 2 days to finish.
Make the cleanest water possible and test it three times.
Explanation
This question tests identifying constraints in engineering design (NGSS 3-5-ETS1-1: Define a simple design problem reflecting a need or want that includes specified criteria for success and constraints on materials, time, or cost). Constraints are limits or restrictions on a design solution - they define what you CANNOT do, use, or exceed. The three main types of constraints are: materials (what you can build with), time (how long you have), and cost (how much money you can spend). In this scenario, the constraints are: only coffee filters, sand, gravel, and plastic bottles allowed; 40-minute science period time limit; $0 cost (must use items teacher already has, cannot go shopping). These are limits because they restrict what materials students can use, how much time they have, and prevent any spending. Choice A is correct because it accurately lists all the constraints from the passage: specific materials only, time limit of 40 minutes, and zero cost. Choice B represents confusing criteria with constraints - it describes what the filter must achieve (cleanest water, test three times) rather than the limits on resources. To help students: Create a three-column chart labeled Materials (what can you use?), Time (how long do you have?), and Cost (how much can you spend?). Practice identifying constraints by asking "What are you NOT allowed to use? How much time do you have? Can you spend money?" Emphasize that constraints use limiting words like "only," "must not," "cannot," or "no more than."
Read about the classroom library display challenge. You must display this week's featured books. You can use only cardboard boxes, construction paper, tape, and scissors, and it must cost $0. You must set it up in under 15 minutes, and you cannot use any other materials. Which describes the limits on this design project?
The problem is that books need to be easy to see in class.
Use any supplies you find at home, and take 30 minutes to set up.
Make the display hold 10 books and look exciting for students.
Only cardboard boxes, construction paper, tape, and scissors, set up in under 15 minutes, and spend $0.
Explanation
This question tests identifying constraints in engineering design (NGSS 3-5-ETS1-1: Define a simple design problem reflecting a need or want that includes specified criteria for success and constraints on materials, time, or cost). Constraints are limits or restrictions on a design solution - they define what you CANNOT do, use, or exceed. The three main types of constraints are: materials (what you can build with), time (how long you have), and cost (how much money you can spend). In this scenario, the constraints are: only cardboard boxes, construction paper, tape, and scissors allowed; must set up in under 15 minutes; $0 cost; and no other materials permitted. These are limits because they restrict what materials students can use, how much time they have to set up, and prevent any spending. Choice C is correct because it accurately lists all the constraints from the passage: specific materials only, time limit under 15 minutes, and zero cost. Choice A represents confusing criteria with constraints - it describes what the display must achieve (hold 10 books, look exciting) rather than the limits on resources. To help students: Create a three-column chart labeled Materials (what can you use?), Time (how long do you have?), and Cost (how much can you spend?). Practice identifying constraints by asking "What are you NOT allowed to use? How much time do you have? Can you spend money?" Emphasize that constraints use limiting words like "only," "must not," "cannot," or "no more than."
Read about the classroom library display. You must display this week's featured books before school starts. You can use only cardboard boxes, construction paper, tape, and scissors, and it must cost $0. The display must be set up in under 15 minutes. What are the constraints for this design?
Set up in under 15 minutes, use only boxes, paper, tape, and scissors, and spend no money.
Show the books so students want to read them all week.
Take as much time as you need to make it perfect.
Use glitter, glue, and string to decorate the display.
Explanation
This question tests identifying constraints in engineering design (NGSS 3-5-ETS1-1: Define a simple design problem reflecting a need or want that includes specified criteria for success and constraints on materials, time, or cost). Constraints are limits or restrictions on a design solution - they define what you CANNOT do, use, or exceed. The three main types of constraints are: materials (what you can build with), time (how long you have), and cost (how much money you can spend). In this scenario, the constraints are: use only cardboard boxes, construction paper, tape, and scissors (materials constraint), set up in under 15 minutes (time constraint), and must cost $0 (cost constraint). These are limits because they restrict what materials are available, how quickly the display must be assembled, and prohibit spending money. Choice B is correct because it accurately lists the constraints from the passage: 'Set up in under 15 minutes, use only boxes, paper, tape, and scissors, and spend no money.' These are all restrictions using limiting words like 'only,' 'under,' and 'no money.' Choice D represents the opposite of constraints - it suggests taking unlimited time and buying new materials. Students who choose this may not understand that constraints limit what you can do rather than expand options. To help students: Create a three-column chart labeled Materials (what can you use?), Time (how long do you have?), and Cost (how much can you spend?). Practice identifying constraints by asking 'What are you NOT allowed to use? How much time do you have? Can you spend money?' Emphasize that constraints use limiting words like 'only,' 'must not,' 'cannot,' or 'no more than.'
Look at the project description: Make a classroom library display using only cardboard boxes, construction paper, tape, and scissors. It must cost $0 and be ready in under 15 minutes. What restrictions must students follow when designing their solution?
Use only classroom materials, but you can take as long as you need.
Make the display tall enough to hold every book in the library.
Use cardboard and paper, and try to make it look nice.
Use only cardboard boxes, construction paper, tape, and scissors, set up in under 15 minutes, and spend $0.
Explanation
This question tests identifying constraints in engineering design (NGSS 3-5-ETS1-1: Define a simple design problem reflecting a need or want that includes specified criteria for success and constraints on materials, time, or cost). Constraints are limits or restrictions on a design solution - they define what you CANNOT do, use, or exceed. The three main types of constraints are: materials (what you can build with), time (how long you have), and cost (how much money you can spend). In this scenario, the constraints are: use only cardboard boxes, construction paper, tape, and scissors, must cost $0, and must be ready in under 15 minutes. These are limits because they restrict what materials are available, how much time they have to build, and whether they can spend money. Choice B is correct because it accurately lists all the constraints from the passage: specific materials allowed, time limit of 15 minutes, and zero cost. Choice A is incomplete - it mentions classroom materials but doesn't specify which ones and incorrectly states "take as long as you need" when there's actually a 15-minute time constraint. To help students: Create a three-column chart labeled Materials (what can you use?), Time (how long do you have?), and Cost (how much can you spend?). Practice identifying constraints by asking "What are you NOT allowed to use? How much time do you have? Can you spend money?" Emphasize that constraints use limiting words like "only," "must not," "cannot," or "no more than."
Read about the classroom library display. You can use only cardboard boxes, construction paper, tape, and scissors. It must be ready in under 15 minutes and cost $0, with no extra supplies allowed. Which statement lists the constraints on materials, time, or cost?
Make the display hold many books and be easy to read.
Only classroom supplies, set up quickly, and try to keep it cheap.
Only cardboard boxes, construction paper, tape, and scissors, under 15 minutes, and $0 cost.
Use paint, staples, and wood, and set up in under 30 minutes.
Explanation
This question tests identifying constraints in engineering design (NGSS 3-5-ETS1-1: Define a simple design problem reflecting a need or want that includes specified criteria for success and constraints on materials, time, or cost). Constraints are limits or restrictions on a design solution - they define what you CANNOT do, use, or exceed. The three main types of constraints are: materials (what you can build with), time (how long you have), and cost (how much money you can spend). In this scenario, the constraints are: only cardboard boxes, construction paper, tape, and scissors allowed; under 15 minutes to set up; $0 cost; and no extra supplies permitted. These are limits because they restrict what materials students can use, how much time they have, and prevent any spending. Choice B is correct because it accurately lists all the constraints from the passage: specific materials only, time limit under 15 minutes, and zero cost. Choice A represents being too vague - it says "only classroom supplies" and "try to keep it cheap" rather than listing the specific materials and exact cost constraint. To help students: Create a three-column chart labeled Materials (what can you use?), Time (how long do you have?), and Cost (how much can you spend?). Practice identifying constraints by asking "What are you NOT allowed to use? How much time do you have? Can you spend money?" Emphasize that constraints use limiting words like "only," "must not," "cannot," or "no more than."
Read about the paper bridge challenge. Limits: only 10 sheets of paper and tape; no glue; finish in 20 minutes; teacher provides materials. What rules must students follow about materials, time, or money?
Use 10 sheets of paper, but you can take 60 minutes to build.
Use tape, glue, and cardboard to make the bridge extra strong.
Build the longest bridge possible across the whole classroom.
Use only paper and tape from the teacher, and finish building in 20 minutes.
Explanation
This question tests identifying constraints in engineering design (NGSS 3-5-ETS1-1: Define a simple design problem reflecting a need or want that includes specified criteria for success and constraints on materials, time, or cost). Constraints are limits or restrictions on a design solution - they define what you CANNOT do, use, or exceed. The three main types of constraints are: materials (what you can build with), time (how long you have), and cost (how much money you can spend). For example, "must use only cardboard, finish in 20 minutes, and spend $0" lists all three constraint types. Constraints are different from success criteria - criteria say what the solution must ACHIEVE while constraints say what limits you must WORK WITHIN. In this scenario, the constraints are only 10 sheets of paper and tape; no glue; finish in 20 minutes; teacher provides materials: these are limits because they restrict what materials are available, how much time they have to build, and whether they can buy materials. Choice A is correct because it accurately lists the constraints from the passage: use only paper and tape from the teacher, and finish building in 20 minutes. These are all restrictions or limits (using words like "only," "finish in") rather than goals or criteria. Choice B represents confusing criteria with constraints. Students who choose this may think what the solution must DO is the same as what limits exist. To help students: Create a three-column chart labeled Materials (what can you use?), Time (how long do you have?), and Cost (how much can you spend?). Practice identifying constraints by asking "What are you NOT allowed to use? How much time do you have? Can you spend money?" Emphasize that constraints use limiting words like "only," "must not," "cannot," or "no more than."
Look at the plant marker project: make 20 garden markers. Students may use only popsicle sticks, markers, and clear tape from the art closet, must finish in 45 minutes, and cannot buy anything new. What rules must students follow about materials, time, or money?
Label vegetables for the garden club so people know what is growing.
Use paint and wooden boards if you want, and take all week to finish.
Use only popsicle sticks, markers, and clear tape, make them during 45 minutes, and spend $0 with no shopping.
Make the markers bright and easy to read from far away.
Explanation
This question tests identifying constraints in engineering design (NGSS 3-5-ETS1-1: Define a simple design problem reflecting a need or want that includes specified criteria for success and constraints on materials, time, or cost). Constraints are limits or restrictions on a design solution - they define what you CANNOT do, use, or exceed. The three main types of constraints are: materials (what you can build with), time (how long you have), and cost (how much money you can spend). In this scenario, the constraints are using only popsicle sticks, markers, and clear tape from the art closet, finishing in 45 minutes, and not buying anything new: these are limits because they restrict what materials are available, how much time students have to build, and prohibit spending money. Choice A is correct because it accurately lists the constraints from the passage: using only specific materials, making them in 45 minutes, and spending $0 with no shopping. Choice B represents confusing criteria with constraints. Students who choose this may think what the solution must achieve is the same as what limits exist. To help students: Create a three-column chart labeled Materials (what can you use?), Time (how long do you have?), and Cost (how much can you spend?). Practice identifying constraints by asking "What are you NOT allowed to use? How much time do you have? Can you spend money?" Emphasize that constraints use limiting words like "only," "must not," "cannot," or "no more than."
Read about the egg drop design challenge. Students must protect an egg dropped from 6 feet. They can use only cardboard, plastic bottles, and newspaper from the recycling bin, and it must cost $0. They have 30 minutes, and the design must fit in a shoebox. Which describes what students CANNOT use or do?
They cannot make the egg land safely in the container.
They cannot buy new supplies or use materials not in the recycling bin.
They cannot try more than one design idea.
They cannot drop the egg from 6 feet.
Explanation
This question tests identifying constraints in engineering design (NGSS 3-5-ETS1-1: Define a simple design problem reflecting a need or want that includes specified criteria for success and constraints on materials, time, or cost). Constraints are limits or restrictions on a design solution - they define what you CANNOT do, use, or exceed. The three main types of constraints are: materials (what you can build with), time (how long you have), and cost (how much money you can spend). In this scenario, the constraints include: only recycling bin materials allowed (cardboard, plastic bottles, newspaper), $0 cost, 30-minute time limit, and must fit in a shoebox. These are limits because they restrict what materials students can use and prevent them from buying new supplies. Choice A is correct because it accurately identifies what students CANNOT do: they cannot buy new supplies or use materials not in the recycling bin, which directly addresses the material and cost constraints. Choice C represents misunderstanding the problem - dropping from 6 feet is the test condition, not something students cannot do. To help students: Create a three-column chart labeled Materials (what can you use?), Time (how long do you have?), and Cost (how much can you spend?). Practice identifying constraints by asking "What are you NOT allowed to use? How much time do you have? Can you spend money?" Emphasize that constraints use limiting words like "only," "must not," "cannot," or "no more than."
Look at the classroom library display task: show featured books before school starts. You may use only cardboard boxes, construction paper, tape, and scissors, and must set up in under 15 minutes with $0. What restrictions must students follow when designing their solution?
Pick the best books and tell students why they are great.
Use any materials, but make it tall enough for everyone to see.
Use only cardboard boxes, construction paper, tape, and scissors, set up in under 15 minutes, and spend $0.
Set up in under 10 minutes, and you may use glue and staples.
Explanation
This question tests identifying constraints in engineering design (NGSS 3-5-ETS1-1: Define a simple design problem reflecting a need or want that includes specified criteria for success and constraints on materials, time, or cost). Constraints are limits or restrictions on a design solution - they define what you CANNOT do, use, or exceed. The three main types of constraints are: materials (what you can build with), time (how long you have), and cost (how much money you can spend). In this scenario, the constraints are using only cardboard boxes, construction paper, tape, and scissors, setting up in under 15 minutes, and costing $0: these are limits because they restrict what materials are available, how much time students have to set up, and prohibit spending money. Choice B is correct because it accurately lists the constraints from the passage: using only specific materials, setting up in under 15 minutes, and spending $0. Choice C represents confusing criteria with constraints. Students who choose this may think what the solution must achieve is the same as what limits exist. To help students: Create a three-column chart labeled Materials (what can you use?), Time (how long do you have?), and Cost (how much can you spend?). Practice identifying constraints by asking "What are you NOT allowed to use? How much time do you have? Can you spend money?" Emphasize that constraints use limiting words like "only," "must not," "cannot," or "no more than."
Read about the design challenge: Make a classroom library display for this week’s featured books. You can use only cardboard boxes, construction paper, tape, and scissors, it must cost $0, and it must be set up in under 15 minutes. What are the constraints for this design?
Use glue, staples, and wood so the display lasts all year.
Show as many books as possible and make the tallest display.
The display should look colorful and make students want to read.
Use only cardboard boxes, construction paper, tape, and scissors, set up in under 15 minutes, and spend $0.
Explanation
This question tests identifying constraints in engineering design (NGSS 3-5-ETS1-1: Define a simple design problem reflecting a need or want that includes specified criteria for success and constraints on materials, time, or cost). Constraints are limits or restrictions on a design solution - they define what you CANNOT do, use, or exceed. The three main types of constraints are: materials (what you can build with), time (how long you have), and cost (how much money you can spend). In this scenario, the constraints are: use only cardboard boxes, construction paper, tape, and scissors, must cost $0, and must be set up in under 15 minutes. These are limits because they restrict what materials are available, how much time they have to build, and whether they can spend money. Choice B is correct because it accurately lists all the constraints from the passage: specific materials allowed, time limit of 15 minutes, and zero cost. Choice A represents confusing criteria with constraints - making it colorful and appealing are goals for what the display should achieve rather than limitations on resources. To help students: Create a three-column chart labeled Materials (what can you use?), Time (how long do you have?), and Cost (how much can you spend?). Practice identifying constraints by asking "What are you NOT allowed to use? How much time do you have? Can you spend money?" Emphasize that constraints use limiting words like "only," "must not," "cannot," or "no more than."