Assertion: Work done by the force of friction in moving a body around a closed loop is zero.
Reason: Work done does not depend upon the nature of force.

Options

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

Answer

D

Explanation

Work done during the motion of a body over a closed path depends upon whether the force doing work is conservative or non-conservative in nature. For conservative forces like gravitational force work done is zero. For non-conservative forces like frictional force some work is done