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CBSE Class 11-science Answered

What is work done by a nonconservative force in a round trip? Support your answer with a proof.
Asked by Jaziya | 25 Nov, 2010, 12:00: AM
answered-by-expert 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.
 
Hope this helps.
Thanking you
Team
Topperlearning.com
Answered by | 26 Nov, 2010, 10:41: AM

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