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friction
Friction opposes relative motion.
Class 4 · English Version · General science
Forces, friction and movement
Explore forces, friction and movement with an example and your own answers.
Original Kidemy foundation practice · Read the example, write your answers, then check. This starter is shared across class versions; it is not a complete board-specific lesson or course.
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Learn the idea
Friction is a force resisting relative movement between surfaces. It can slow an object, and it also helps feet grip the ground.
Worked example
A toy car may roll a shorter distance on rough carpet than on a smooth board if other conditions are alike.
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- Try each task yourself, then compare the answer and its reason.
Your written practice
Show your working on paper and enter your answer here. If it does not match, compare the model and try again.
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rough rubber
Rough rubber usually provides greater friction.
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Changing the car could also change the distance travelled.
Check that the answer identifies a possible extra cause of a changed result.
Take it further
Apply the idea in a new situation and explain your method. Open writing needs a guardian or teacher to review it.
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friction
Friction acts against relative sliding or its tendency.
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change of shape
Pulling can alter the shape.
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Use the same car, starting position and release method, and repeat the measurements.
Identify other influences before attributing differences to the surface.
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