First slide

Static friction

Question

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

Easy

A

If both assertion and reason are true and reason is a true explanation of assertion.
B

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

If assertion is true but reason is false.
D

If both assertion and reason are false.

Solution

Only static friction is a self-adjusting force. This is because force of static friction is equal and opposite to the force applied parallel to the plane of tangency between two objects in contact ( so long as actual motion does not start). .
Also maximum frictional force $f_{m a x} = μ N; T h i s N m a y n o t b e e q u a l t o m g .$

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