Question

Explain how work is done when we displace a body against force of friction ?
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Answer 1

Answer:

Friction is the force that is resisting the motion of an object so it will always point in the opposite direction of that of movement. For example, when an object is sliding on a table it does work against friction . The force of friction will eventually stop it .

Explanation:

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Answer 2

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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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ANSWER

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.