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  4. Assertion: Work done in moving a body over a closed loop is zero for every force in nature. Reason: Work done does not depend on nature of force.

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Q. Assertion : Work done in moving a body over a closed loop is zero for every force in nature.
Reason : Work done does not depend on nature of force.

AIIMSAIIMS 2017Work, Energy and Power

Solution:

Work done in the motion of a body over a closed loop is zero only when the body is moving under the action of conservative forces (like gravitational or electrostatic forces). It is not zero when the forces are non-conservative e.g. frictional forces etc.