Question

Write down an example where the force acting on a body does no work?

Answer 1

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Class 11

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>>Introduction to Work

>>It is possible that a force is acting on

Question



It is possible that a force is acting on a body but still the work done is zero? Explain given the example.

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Solution



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Yes, if force is acting on a body work done can be zero. When an object is at rest and no external force except gravity is acting on it in this case the work that would be zero as the force acting on it is perpendicular.

For example,

 When an object is at rest and no external force except gravity is acting on it in this case the work that would be zero as the force acting on it is perpendicular. Therefore the displacement is zero and if displacement is zero work done would be zero.

We know that,

The work done

W=fs

Suppose that displacement is zero then,

  W=f×0

 W=0

The work done is zero. 

 

Answer 2

pushing a wall. force applied by body on wall is so less than the required force to move wall