FRICTION
- Briefly explain how friction lowers the efficient of a machine.
- Explain why a rotating wonder wheel becomes hot after a sudden stop.
- In which instances do you think friction is not useful? Give four reasons.
- From our experience, it is more difficult to push or pull an object to get it moving than it is to keep it moving. Explain why?
- Explain four methods of reducing friction.
- Explain why the coefficient of static friction is larger than the coefficient of kinetic friction?
- Why does as streamlined car use fuel more efficiently than another similar car experiences larger air resistance forces?
- Briefly explain three causes of friction.
- A trolley moving at a uniform speed on a horizontal bench slows down when a lump of plasticine dropped vertically sticks to it. As physicist explain to your friend why trolley slows down.
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