Starter quiz
- Which is the best description of a friction force?
- The downwards force due to gravity.
- The force of one surface gripping or rubbing on another surface. ✓
- The force from the air that slows down moving objects.
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- Which picture shows a friction force?
- Which factor can affect the size of the friction force acting when an object slides over a surface?
- The colour of the surface.
- How rough the surface is. ✓
- How transparent the surface is.
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- Give the correct direction: Friction forces always act ______ on a moving object.
- 'backwards' ✓
- Which sentences describe the correct effects that friction forces can have on objects?
- Friction forces slow down moving objects. ✓
- Friction forces can repel objects away .
- Friction forces can heat up objects. ✓
- Friction forces pull objects back down towards planet Earth.
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- An object is sliding along a surface. Which of the following can reduce the friction force?
- If the surface was smoother. ✓
- If the surface was rougher.
- If the surface was sanded down. ✓
- If a slippery liquid or grease was added between the object and the surface. ✓
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