Question

If work done on a body is zero examples are

Answer 1

One of a good example is-

You are pushing a bus.

In this case the work done is 0 since the displacement is 0.

Another example is a car is moving at constant velocity.Since the acceleration is 0 the force is also 0 and since the force is 0 work done will certainly be 0.

Hope it helps.

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Answer 2

Ex : when displacement is o , like if we push a wall and it does not move

Angle between force and point of application is 0 like coolie carrying luggage on his head , when static friction acts then overall work done by it is 0 ,work done by conservative forces like gavity ,spring force In a round trip is 0