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Assertion: Friction opposes relative mot...

Assertion: Friction opposes relative motion and thereby dissipates power in the form of heat.
Reason: Friction is always an undesirable force.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true and reason is the not correct explanation of assertion.

C

If assertion is true but reason is false

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
C
We consider friction as an undesirable force sometimes, not always. In many situation, like in a machine with different moving parts, friction does have a negative role. It opposes relative motion and thereby dissipates power in the form of heat etc.
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