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Question

Which of the following is/are true about the friction?
  1. Friction opposes motion.
  2. Friction increases by making surfaces rough.
  3. Friction generates heat.
  4. Friction supports motion.


Solution

The correct options are
A Friction opposes motion.
B Friction increases by making surfaces rough.
C Friction generates heat.
Friction opposes motion and that is why, a moving ball finally comes to rest on ground.
Friction increases by increasing the roughness of the surfaces in contact.
Friction produces heat. That is why, we feel warm when we rub our hands against each other.

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