What is work done by a nonconservative force in a round trip? Support your answer with a proof.

Asked by Jaziya | 25th Nov, 2010, 12:00: AM

Expert Answer:

Dear student,
A block of mass m is lifted up through a height h. The work done by the gravitational force is -mgh since gravitational force is in the opposite direction of displacement. If the block is allowed to fall through the same height h the work done by the gravitational force is +mgh since the displacement is in the same direction of gravitational force. The total work done by the gravitational force for the round trip is zero.
 
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Answered by  | 26th Nov, 2010, 10:41: AM

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