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

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
We consider friction as an undesirable force sometimes but not always. For example, we can walk easily on the ground because the ground offers friction. 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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