What is friction?
Friction is a force that opposes the relative motion between two surfaces that are in contact.
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Describe two advantages of friction.
1. Friction allows motion to start and stop.
2. Friction prevents slipping.
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How does friction waste energy?
Friction converts useful energy into heat energy which is wasted.
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How does friction limit top speed in vehicles?
At high speeds, air resistance is a form of friction which takes a lot of energy to overcome, limiting top speeds.
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What are the disadvantages of friction?
1. Friction wastes energy.
2. Friction limits top speed.
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