question_answer

Is it possible that a body be in accelerated motion under a force acting on the body, yet no work is being done by the force. Give example.

Answer:

                Yes, it is possible. For example, under centripetal force, a body moves uniformly in a circle with centripetal acceleration. But no work is done, as \[\text{W}=\text{Fs}\,\text{cos }\!\!\theta\!\!\text{ }=\text{Fs}\,\text{cos 9}0{}^\circ =\text{Zero}\].