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friction
Friction opposes relative motion.
Class 4 · English Medium · Cambridge · 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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Your written practice
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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.
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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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