- Read about the test students are planning. Yuki tests ramp heights to see how far a toy car rolls. To make it a fair test, what should she keep the same?
Answer: Keep the same car, same ramp material, same starting position, and same floor; measure from the same spot each time and ONLY change the ramp height.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. In this scenario, students want to test how ramp height affects car rolling distance. To make it fair, they should keep these variables the same: same car, same ramp material, same starting position, same floor surface, and same measurement spot. The ONLY thing they should change is the ramp height. Choice A is correct because it identifies proper controls: keeping the same car, same ramp material, same starting position, and same floor while measuring from the same spot each time and ONLY changing the ramp height. This makes the test fair because if all other factors stay the same, any difference in distance must come from the ramp height being tested. Choice B represents keeps test variable same. Students who choose this may confuse what should change with what should stay same or think the car is what's being tested rather than ramp height. To help students: Create T-chart labeled "What Changes (Test Variable)" and "What Stays Same (Control Variables)." There should be only ONE item under "what changes" and multiple items (3-5) under "what stays same." Ask: "If ramp height AND car type both change, can we tell which one caused the result?" Practice identifying: "We're testing ramp height, so ramp height changes. Everything else must stay the same." Use formula: ONLY change ramp height; keep car, ramp material, starting position, floor, and measurement all the same.
- Read about the test students are planning. Sofia will test 3 paper airplane designs to see which flies farthest. Which test plan is fair?
Answer: Use the same thrower, throw from 6 feet with the same force in the gym, measure to the nose, and only change the plane design.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. In this scenario, Sofia wants to test which paper airplane design flies farthest. To make it fair, she should keep these variables the same: same thrower, throw from 6 feet height, same throwing force, test in the gym (no wind), and measure to the nose. The ONLY thing she should change is the airplane design. Choice C is correct because it identifies proper controls: using the same thrower, height, force, location, and measurement method. This makes the test fair because if all other factors stay the same, any difference in distance must come from the airplane design being tested. Choice A represents changes multiple variables. Students who choose this may think higher throws help show which plane is best, not understanding that changing throw height makes it impossible to know if distance came from height or design. To help students: Create T-chart labeled "What Changes (Test Variable)" and "What Stays Same (Control Variables)." There should be only ONE item under "what changes" and multiple items (3-5) under "what stays same." Ask: "If airplane design AND throw height both change, can we tell which one caused the result?" Practice identifying: "We're testing airplane design, so design changes. Everything else must stay the same." Use formula: ONLY change airplane design; keep thrower, height, force, location, and measurement all the same.
- Read about the experiment. Sofia has 6 bean plants and wants to test sunlight vs shade. What is the one thing she should change in a fair test?
Answer: Change only where the plants sit (sunny window or shady corner) and keep pots, soil, water each day, and start day the same.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. In this scenario, students want to test if plants grow better in sunlight vs shade. To make it fair, they should keep these variables the same: pot size, soil type, water amount each day, and starting day. The ONLY thing they should change is the location (sunny window or shady corner). Choice B is correct because it identifies the proper test variable: only changing where plants sit while keeping pots, soil, water, and start day constant. This makes the test fair because any difference in plant growth must come from the light conditions being tested. Choice C represents changing multiple variables by varying both water amount and location. Students who choose this may confuse helping plants grow with testing one specific factor, not understanding that changing multiple variables makes results unclear. To help students: Create T-chart labeled "What Changes (Test Variable)" and "What Stays Same (Control Variables)." There should be only ONE item under "what changes" (light location) and multiple items (3-5) under "what stays same" (pots, soil, water, start day). Ask: "If location AND water both change, can we tell which one caused the growth difference?" Practice identifying: "We're testing sunlight vs shade, so location changes. Everything else must stay the same." Use formula: ONLY change plant location; keep pots, soil, water, and timing all the same.
- Read about the test students are planning. Carlos will roll the same toy car down a ramp. Which describes a fair test of ramp height and distance?
Answer: Use the same car, same cardboard ramp, same starting spot, and same floor; only change the ramp height and measure from the ramp end each time.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. In this scenario, Carlos wants to test how ramp height affects rolling distance. To make it fair, he should keep these variables the same: same car, same cardboard ramp material, same starting spot, same floor surface, and measure from the ramp end. The ONLY thing he should change is the ramp height. Choice A is correct because it identifies proper controls: using the same car, ramp material, starting spot, floor, and measurement point. This makes the test fair because if all other factors stay the same, any difference in rolling distance must come from the ramp height being tested. Choice B represents changes multiple variables. Students who choose this may think different cars make the test more interesting, not understanding that changing both height and car makes it impossible to know which factor caused the distance differences. To help students: Create T-chart labeled "What Changes (Test Variable)" and "What Stays Same (Control Variables)." There should be only ONE item under "what changes" and multiple items (3-5) under "what stays same." Ask: "If ramp height AND car type both change, can we tell which one caused the result?" Practice identifying: "We're testing ramp height, so height changes. Everything else must stay the same." Use formula: ONLY change ramp height; keep car, ramp material, start spot, floor, and measurement point all the same.
- Read about the test students are planning. Yuki will compare 3 paper airplane designs to see which flies farthest. She will throw them 3 times each from 6 feet in the gym. To make this a fair test, what should Yuki keep the same?
Answer: Keep the gym, throwing height of 6 feet, throwing force, and how you measure (to the nose) the same; only change the plane design and throw each 3 times.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. For example, if you test airplane designs but also change throwing height and location, you won't know if distance differences came from the design or the other changes. Fair tests help you understand what really causes the results. In this scenario, students want to test which paper airplane design flies farthest. To make it fair, they should keep these variables the same: location in gym, throwing height of 6 feet, throwing force, measurement to the nose, and throw each 3 times. The ONLY thing they should change is the airplane design. Choice B is correct because it identifies proper controls: 'Keep the gym, throwing height of 6 feet, throwing force, and how you measure (to the nose) the same; only change the plane design and throw each 3 times.' This makes the test fair because if all other factors stay the same, any difference in results must come from the design being tested. Choice A represents keeps test variable same. Students who choose this may confuse what should change with what should stay same. To help students: Create T-chart labeled 'What Changes (Test Variable)' and 'What Stays Same (Control Variables).' There should be only ONE item under 'what changes' and multiple items (3-5) under 'what stays same.' Ask: 'If [variable X] AND [variable Y] both change, can we tell which one caused the result?' Practice identifying: 'We're testing [X], so [X] changes. Everything else must stay the same.' Use formula: ONLY change [test variable]; keep [list controls] all the same.
- Read about the experiment. Marcus tests if plants grow better in sunlight or shade for 2 weeks. Which describes a fair test plan?
Answer: Keep type of plant, pot size, soil amount, and water each day the same; ONLY change light location and measure plant height after 2 weeks.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. In this scenario, students want to test if plants grow better in sunlight or shade. To make it fair, they should keep these variables the same: type of plant, pot size, soil amount, and water given each day. The ONLY thing they should change is the light location (sunny vs shady). Choice C is correct because it identifies proper controls: same plant type, pot size, soil, and water, while only changing light location. This makes the test fair because if all other factors stay the same, any difference in plant height after 2 weeks must come from the light conditions being tested. Choice A represents changes multiple variables by watering sunny plants more often. Students who choose this may think sunny plants need more water to be fair, not understanding that changing both light and water makes it impossible to know which factor caused growth differences. To help students: Create T-chart labeled "What Changes (Test Variable)" and "What Stays Same (Control Variables)." There should be only ONE item under "what changes" (light location) and multiple items (3-5) under "what stays same" (plant type, pots, soil, water). Ask: "If light AND water both change, can we tell which one caused better growth?" Practice identifying: "We're testing sunlight vs shade, so light location changes. Everything else must stay the same." Use formula: ONLY change light location; keep plant type, pots, soil, and water all the same.
- Look at the experiment. Carlos has 6 bean plants to test if plants grow better in sunlight or shade for 2 weeks. He will use the same pots, same soil, and water each plant the same each day. Why is it important to keep the water amount the same?
Answer: So only the light place (sun or shade) can cause changes in growth, not extra water.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. For example, if you test airplane designs but also change throwing height and location, you won't know if distance differences came from the design or the other changes. Fair tests help you understand what really causes the results. In this scenario, students want to test if plants grow better in sunlight or shade. To make it fair, they should keep these variables the same: pots, soil, water amount each day, and measurement after 2 weeks. The ONLY thing they should change is the light place (sun or shade). Choice B is correct because it explains the importance of controlling water: 'So only the light place (sun or shade) can cause changes in growth, not extra water.' This makes the test fair because keeping water constant means only light affects growth, making results reliable. Choice C represents a misunderstanding of fair testing. Students who choose this may think fair test just means being nice to everyone rather than controlling variables. To help students: Create T-chart labeled 'What Changes (Test Variable)' and 'What Stays Same (Control Variables).' There should be only ONE item under 'what changes' and multiple items (3-5) under 'what stays same.' Ask: 'If [variable X] AND [variable Y] both change, can we tell which one caused the result?' Practice identifying: 'We're testing [X], so [X] changes. Everything else must stay the same.' Use formula: ONLY change [test variable]; keep [list controls] all the same.
- Read about the test students are planning. Yuki is testing ramp heights to see how far the same toy car rolls. To make this a fair test, what should she keep the same?
Answer: Keep the car, starting spot on the ramp, ramp material, and floor surface the same; ONLY change the ramp height and measure from the ramp end.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. In this scenario, students want to test how ramp height affects rolling distance. To make it fair, they should keep these variables the same: the toy car, starting spot on the ramp, ramp material, floor surface, and measurement starting point. The ONLY thing they should change is the ramp height. Choice A is correct because it identifies proper controls: keep the car, starting spot, ramp material, and floor surface the same, while only changing ramp height and measuring consistently from the ramp end. This makes the test fair because any difference in rolling distance must come from the ramp height being tested. Choice C represents changes multiple variables - students who choose this may not understand that changing both height AND floor surface makes it impossible to know which factor caused distance differences. To help students: Create T-chart labeled "What Changes (Test Variable)" and "What Stays Same (Control Variables)." There should be only ONE item under "what changes" and multiple items (3-5) under "what stays same." Ask: "If height AND floor surface both change, can we tell which one caused the result?" Practice identifying: "We're testing ramp height, so height changes. Everything else must stay the same." Use formula: ONLY change ramp height; keep car, starting spot, ramp, and floor all the same.
- Read about the test students are planning. Sofia has 6 bean plants and wants to test sunlight versus shade for 2 weeks. What is the one thing she should change in this test?
Answer: Change where the plants are placed (sunny window or shady corner) and keep pot size, soil amount, water each day, and start day the same.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. In this scenario, students want to test if sunlight versus shade affects plant growth. To make it fair, they should keep these variables the same: plant type (all beans), pot size, soil amount, water amount each day, and start day. The ONLY thing they should change is the location (sunny window or shady corner). Choice C is correct because it identifies the proper test variable: changing where plants are placed while keeping pot size, soil amount, water, and start day constant. This makes the test fair because any difference in growth must come from the light conditions being tested. Choice B represents changes multiple variables - students who choose this may not understand that changing both plant type AND location makes it impossible to know if differences come from the plant species or the light. To help students: Create T-chart labeled "What Changes (Test Variable)" and "What Stays Same (Control Variables)." There should be only ONE item under "what changes" and multiple items (3-5) under "what stays same." Ask: "If plant type AND location both change, can we tell which one caused the result?" Practice identifying: "We're testing sunlight, so location changes. Everything else must stay the same." Use formula: ONLY change plant location; keep plant type, pot size, soil, water, and timing all the same.
- Read about the test students are planning. Maya will drop parachutes from 6 feet to see if bigger ones fall slower. To make a fair test, what should she change?
Answer: Change only the parachute size (8, 12, 16 inches); keep plastic material, square shape, 10-inch strings, same clay ball weight, and drop height 6 feet the same.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. In this scenario, Maya wants to test if bigger parachutes fall slower. To make it fair, she should keep these variables the same: plastic material, square shape, 10-inch strings, same clay ball weight, and drop height of 6 feet. The ONLY thing she should change is the parachute size (8, 12, 16 inches). Choice A is correct because it identifies proper controls: changing only parachute size while keeping all other factors constant. This makes the test fair because if all other factors stay the same, any difference in falling speed must come from the parachute size being tested. Choice B represents changing multiple variables. Students who choose this may not understand that changing both parachute size AND string length makes it impossible to know whether size or string length caused the results. To help students: Create T-chart labeled "What Changes (Test Variable)" and "What Stays Same (Control Variables)." There should be only ONE item under "what changes" and multiple items (3-5) under "what stays same." Ask: "If parachute size AND string length both change, can we tell which one caused the result?" Practice identifying: "We're testing parachute size, so size changes. Everything else must stay the same." Use formula: ONLY change parachute size; keep material, shape, strings, weight, and drop height all the same.
- Read about the test students are planning. Keisha wraps cups of ice with newspaper, bubble wrap, or foil to see which keeps ice frozen longest. To make this a fair test, what should she keep the same?
Answer: Keep the cups the same size, use 4 ice cubes in each, wrap with two layers, and keep all cups in the same room; ONLY change the wrapping material.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. In this scenario, students want to test which wrapping material keeps ice frozen longest. To make it fair, they should keep these variables the same: cup size, number of ice cubes (4), number of wrap layers (2), and room location/temperature. The ONLY thing they should change is the wrapping material (newspaper, bubble wrap, or foil). Choice B is correct because it identifies proper controls: keeping cups the same size, using 4 ice cubes in each, wrapping with two layers, and keeping all cups in the same room while ONLY changing the wrapping material. This makes the test fair because if all other factors stay the same, any difference in melting time must come from the wrapping material being tested. Choice C represents keeps test variable same. Students who choose this may confuse what should change with what should stay same or think fair test means keeping everything identical. To help students: Create T-chart labeled "What Changes (Test Variable)" and "What Stays Same (Control Variables)." There should be only ONE item under "what changes" and multiple items (3-5) under "what stays same." Ask: "If wrapping material AND cup size both change, can we tell which one caused the result?" Practice identifying: "We're testing wrapping material, so wrapping material changes. Everything else must stay the same." Use formula: ONLY change wrapping material; keep cup size, ice amount, layers, and room all the same.
- Read about the test students are planning. Emma will test if parachute size changes how fast it falls. To make this a fair test, what should she keep the same?
Answer: Keep shape square, plastic material, 10-inch strings, same clay ball weight, and drop from 6 feet each time; only change the parachute size.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. In this scenario, Emma wants to test if parachute size changes falling speed. To make it fair, she should keep these variables the same: square shape, plastic material, 10-inch strings, same clay ball weight, and drop from 6 feet. The ONLY thing she should change is the parachute size. Choice C is correct because it identifies all proper controls: keeping shape, material, strings, weight, and drop height constant. This makes the test fair because if all other factors stay the same, any difference in falling speed must come from the parachute size being tested. Choice A represents changes multiple variables. Students who choose this may think bigger parachutes need higher drops, not understanding that changing both size and height makes it impossible to know which factor affected the falling speed. To help students: Create T-chart labeled "What Changes (Test Variable)" and "What Stays Same (Control Variables)." There should be only ONE item under "what changes" and multiple items (3-5) under "what stays same." Ask: "If parachute size AND drop height both change, can we tell which one caused the result?" Practice identifying: "We're testing parachute size, so size changes. Everything else must stay the same." Use formula: ONLY change parachute size; keep shape, material, strings, weight, and drop height all the same.
- Look at the experiment. Sofia is testing if sunlight or shade helps bean plants grow taller in 2 weeks. She uses the same pots, soil, and water each day. To make the test fair, what else should she keep the same?
Answer: Start all plants on the same day and use the same kind of bean plant, while only changing the plant location (sunny window or shady corner).
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. For example, if you test plant growth in sun versus shade but also change plant types and start days, you won't know if height differences came from light or the other changes. Fair tests help you understand what really causes the results. In this scenario, students want to test if sunlight or shade helps bean plants grow taller. To make it fair, they should keep these variables the same: plant type, pots, soil, water amount, start day. The ONLY thing they should change is the location (sunny or shady). Choice A is correct because it identifies proper controls: Start all plants on the same day and use the same kind of bean plant, while only changing the plant location (sunny window or shady corner). This makes the test fair because if all other factors stay the same, any difference in results must come from the location being tested. Choice B represents changes multiple variables. Students who choose this may not understand that changing multiple things makes it impossible to know what caused the results. To help students: Create T-chart labeled "What Changes (Test Variable)" and "What Stays Same (Control Variables)." There should be only ONE item under "what changes" and multiple items (3-5) under "what stays same." Ask: "If [variable X] AND [variable Y] both change, can we tell which one caused the result?" Practice identifying: "We're testing [X], so [X] changes. Everything else must stay the same." Use formula: ONLY change [test variable]; keep [list controls] all the same.
- Read about the test students are planning. Jamal made 3 paper airplane designs and wants to see which flies farthest in the gym. To make it a fair test, what should he keep the same?
Answer: Throw all planes from 6 feet high, with the same force, in the gym with no wind, and measure to the nose of the plane; ONLY change the plane design.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. In this scenario, students want to test which paper airplane design flies farthest. To make it fair, they should keep these variables the same: throwing height (6 feet), throwing force, location (gym with no wind), and measurement method (to the nose). The ONLY thing they should change is the airplane design. Choice A is correct because it identifies proper controls: same height, same force, same location, same measurement point, and only changes the plane design. This makes the test fair because if all other factors stay the same, any difference in flight distance must come from the design being tested. Choice B represents keeping test variable same - students who choose this may confuse what should change (design) with what should stay same (height). To help students: Create T-chart labeled "What Changes (Test Variable)" and "What Stays Same (Control Variables)." There should be only ONE item under "what changes" and multiple items (3-5) under "what stays same." Ask: "If height AND design both change, can we tell which one caused the result?" Practice identifying: "We're testing airplane design, so design changes. Everything else must stay the same." Use formula: ONLY change airplane design; keep height, force, location, and measurement all the same.
- Read about the test students are planning. Maya will wrap cups of ice to see what keeps ice frozen longest: newspaper, bubble wrap, or aluminum foil. Each cup will have 4 ice cubes, 2 layers of material, and stay in the same room. What is the one thing Maya should change?
Answer: Change the wrapping material only; keep cup size, 4 ice cubes, 2 layers, and the same room, and check which cup has ice left after the same time.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. For example, if you test airplane designs but also change throwing height and location, you won't know if distance differences came from the design or the other changes. Fair tests help you understand what really causes the results. In this scenario, students want to test which wrapping material keeps ice frozen longest. To make it fair, they should keep these variables the same: cup size, 4 ice cubes, 2 layers, same room, and check after the same time. The ONLY thing they should change is the wrapping material. Choice B is correct because it identifies changing only the material while keeping controls constant: 'Change the wrapping material only; keep cup size, 4 ice cubes, 2 layers, and the same room, and check which cup has ice left after the same time.' This makes the test fair because if all other factors stay the same, any difference in results must come from the material being tested. Choice C represents changes multiple variables. Students who choose this may confuse what should change with what should stay same. To help students: Create T-chart labeled 'What Changes (Test Variable)' and 'What Stays Same (Control Variables).' There should be only ONE item under 'what changes' and multiple items (3-5) under 'what stays same.' Ask: 'If [variable X] AND [variable Y] both change, can we tell which one caused the result?' Practice identifying: 'We're testing [X], so [X] changes. Everything else must stay the same.' Use formula: ONLY change [test variable]; keep [list controls] all the same.
- Read about the test students are planning. Marcus is testing 3 paper airplane designs to see which flies farthest. Why is it important to throw from the same 6-foot height each time?
Answer: So he can tell if the design caused the distance, not a higher or lower throw.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. In this scenario, Marcus is testing paper airplane designs to see which flies farthest, so he needs to control all variables except design. To make it fair, throwing height must stay constant at 6 feet for all trials. The ONLY thing that should change is the airplane design. Choice B is correct because it explains why height control matters: so he can tell if the design caused the distance, not a higher or lower throw. This makes the test fair because if throwing height varied, a plane thrown from 8 feet might fly farther than one from 4 feet regardless of design quality, making results unreliable. Choice D represents doesn't control important variables - students who choose this may think changing multiple things gives more data rather than understanding it makes results meaningless. To help students: Create T-chart labeled "What Changes (Test Variable)" and "What Stays Same (Control Variables)." There should be only ONE item under "what changes" and multiple items (3-5) under "what stays same." Ask: "If design AND height both change, can we tell which one caused the result?" Practice identifying: "We're testing airplane design, so design changes. Everything else must stay the same." Use formula: ONLY change airplane design; keep height, force, location, and measurement all the same.
- Read about the test students are planning. Emma wants to see which paper airplane design flies farthest. What is the one thing she should change?
Answer: Change the airplane design, and keep throw height 6 feet, same force, indoor gym, and measure to the nose each time.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. In this scenario, students want to test which paper airplane design flies farthest. To make it fair, they should keep these variables the same: throw height (6 feet), throwing force, location (indoor gym), and measurement method (to the nose). The ONLY thing they should change is the airplane design. Choice C is correct because it identifies the proper test variable: changing only the airplane design while keeping height, force, location, and measurement constant. This makes the test fair because any difference in flight distance must come from the design being tested. Choice D represents keeping test variable same by not changing anything. Students who choose this may confuse a fair test with repeating the exact same thing, not understanding that you need to change the one thing you're testing while keeping everything else constant. To help students: Create T-chart labeled "What Changes (Test Variable)" and "What Stays Same (Control Variables)." There should be only ONE item under "what changes" (airplane design) and multiple items (3-5) under "what stays same" (height, force, location, measurement). Ask: "If nothing changes, can we compare different designs?" Practice identifying: "We're testing airplane design, so design changes. Everything else must stay the same." Use formula: ONLY change airplane design; keep height, force, location, and measurement all the same.
- Read about the test students are planning. Chen is testing if higher ramps make a toy car roll farther using 2, 4, 6, 8, and 10 inches. Which variable should he change to test his question?
Answer: Change the ramp height each time and keep the same car, same ramp, same starting spot, and same floor surface for every trial.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. In this scenario, students want to test if higher ramps make a toy car roll farther. To make it fair, they should keep these variables the same: same car, same ramp material, same starting spot on the ramp, and same floor surface. The ONLY thing they should change is the ramp height (2, 4, 6, 8, and 10 inches). Choice B is correct because it identifies proper test variable and controls: change the ramp height each time while keeping the car, ramp, starting spot, and floor surface constant. This makes the test fair because any difference in rolling distance must come from the ramp height being tested. Choice D represents keeps test variable same - students who choose this may confuse what should change (ramp height) with what should stay same (other factors), thinking "fair" means everything stays identical. To help students: Create T-chart labeled "What Changes (Test Variable)" and "What Stays Same (Control Variables)." There should be only ONE item under "what changes" and multiple items (3-5) under "what stays same." Ask: "If ramp height AND car type both change, can we tell which one caused the result?" Practice identifying: "We're testing ramp height, so height changes. Everything else must stay the same." Use formula: ONLY change ramp height; keep car, ramp material, starting spot, and floor all the same.
- Read about the test students are planning. Maya wants to find which material keeps ice frozen longest: newspaper, bubble wrap, or foil. What should students do to make sure their test is fair?
Answer: Use the same size cups, 4 ice cubes each, 2 layers of wrapping, and keep all cups in the same room; ONLY change the wrapping material.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. In this scenario, students want to test which material keeps ice frozen longest. To make it fair, they should keep these variables the same: cup size, number of ice cubes (4), number of wrapping layers (2), and room location/temperature. The ONLY thing they should change is the wrapping material (newspaper, bubble wrap, or foil). Choice C is correct because it identifies proper controls: same size cups, 4 ice cubes each, 2 layers of wrapping, same room, and only changes the wrapping material. This makes the test fair because any difference in melting time must come from the insulation material being tested. Choice A represents changes multiple variables - students who choose this may not understand that changing cup sizes AND locations makes it impossible to know if differences come from the material or these other factors. To help students: Create T-chart labeled "What Changes (Test Variable)" and "What Stays Same (Control Variables)." There should be only ONE item under "what changes" and multiple items (3-5) under "what stays same." Ask: "If material AND cup size both change, can we tell which one caused the result?" Practice identifying: "We're testing insulation material, so material changes. Everything else must stay the same." Use formula: ONLY change wrapping material; keep cup size, ice amount, layers, and location all the same.
- Read about the test students are planning. Emma is testing 3 parachute sizes by dropping them from 6 feet. Which test plan is fair for comparing parachute sizes?
Answer: Use square plastic parachutes, 10-inch strings, the same clay weight, and drop from 6 feet; ONLY change size (8, 12, 16 inches) and time each drop.
This question tests planning fair tests with controlled variables (NGSS 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved). A fair test means changing only ONE thing (the test variable) while keeping everything else the same (control variables). If you change multiple things at once, you can't tell which change caused the results. In this scenario, students want to test how parachute size affects falling speed. To make it fair, they should keep these variables the same: parachute shape (square), material (plastic), string length (10 inches), weight (same clay), and drop height (6 feet). The ONLY thing they should change is the parachute size (8, 12, 16 inches). Choice B is correct because it identifies proper controls: square plastic parachutes, 10-inch strings, same clay weight, 6-foot drop height, and only changes size while timing each drop. This makes the test fair because any difference in falling time must come from the parachute size being tested. Choice A represents changes multiple variables - students who choose this may not understand that dropping from different heights makes it impossible to know if time differences come from size or drop height. To help students: Create T-chart labeled "What Changes (Test Variable)" and "What Stays Same (Control Variables)." There should be only ONE item under "what changes" and multiple items (3-5) under "what stays same." Ask: "If size AND drop height both change, can we tell which one caused the result?" Practice identifying: "We're testing parachute size, so size changes. Everything else must stay the same." Use formula: ONLY change parachute size; keep shape, material, strings, weight, and height all the same.
