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Assertion: Friction is a self-adjusting ...

Assertion: Friction is a self-adjusting force.
Reason: Friction does not depend upon mass of the body

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The correct Answer is:
D
Only static friction is a self-adjusting force. This is because force of static friction is equal and opposite to applied force (so long as actual motion does not start). Friction force `=mumg` , i.e., friction ddepends on mass.
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