lesson
Surfaces can change movement
1 · Learn
A push or pull is a force. When objects rub against a surface, friction can oppose their movement.
A toy car may roll different distances on a smooth board and a rough cloth. To compare the surfaces, keep the car and starting method similar. Releasing from the same ramp height helps more than giving a different push each time.
2 · Worked example
I release a toy car without an extra push. I repeat the test on two surfaces and record each distance instead of choosing only my favourite result.
3 · Your turn
Why is using a different car on each surface an unclear comparison?
Check your answer
Differences between the cars could affect movement as well as the surfaces.
4 · Apply your learning
An adult sets up a low stable ramp and safe clear run area. Repeat trials and discuss differences in the records.
Adult guidance and safety
Use a low ramp, no heavy objects or stairs. Do not claim every smoother surface always gives exactly the same result.
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