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Question

A body is acted upon by a force. State two conditions under which the work done could be zero.


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Solution

Work done is zero:

We know, Workdone(W)=Force(F)×Displacement(s)×Cos,whereistheanglebetweenthedirectionofforceanddisplacement.

So, for the following two conditions, work done by the force on the body is equal to zero.

  1. Displacement is zero: If a body is acted upon by a force but the net displacement is zero, then the work done will also be zero.
  2. The angle between the direction of force and displacement is 90°: Whenever the applied force on the body is perpendicular to the direction of the displacement of the body, then the work done by the force on the body is zero.

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