Question

give one example of zero work done

Answer 1

There are many examples where the work done can be zero. This is one of them:-
1.When the force acting on the object is the perpendicular to the direction of displacement.
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Answer 2

Work done is zero when displacement is zero. This happens when a man pushes a wall. There is no displacement of the wall. Thus, there is no work done. Similarly when a car is moving on a road, there will be a frictional force applied by the road on the. There will be work done by the frictional force on the car. What is the work done on the road by the car? From Newtons third law we can say that to every action, there is an equal and opposite reaction. Thus the force applied by the road on the car will be equal and opposite to the force applied by the car on the road. Since, there is no displacement of the road, there  will be no work done on the road.

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