Question

Is it possible that a body be in accelerated motion under the action of a force yet no work is being done by the force . Explain with an example?

Answer 1

(a) Yes, it is possible in the case of a body moving in a circular path with a speed v. The body has a centripetal acceleration directed along the radius of the circular path. The displacement is, however, tangential to the radius i.e., 0 (theta) = 90°. Thus, work done

W = FS cos 90° = 0.