During uniform circular motion, what is the amount of work done?

In uniform circular motion, an object moves in a circular path at a constant speed. While the object is indeed in motion, work is defined in terms of the force exerted on an object and the displacement of that object in the direction of the force. The crucial aspect of uniform circular motion is that, despite the continuous change in direction of the object's velocity, the speed remains constant.

The force that acts on an object in uniform circular motion is centripetal force, directed towards the center of the circular path. This force does not cause any change in the object's kinetic energy since there is no displacement in the direction of this force—meaning that the force is always perpendicular to the direction of the object's instantaneous velocity. Since work is calculated as the dot product of force and displacement, and in this case, the direction of force is perpendicular to the direction of movement, the net work done on the object is zero.

Therefore, in the context of uniform circular motion, the correct choice indicates that no work is done, reinforcing the understanding that while the object is in motion, the nature of the forces involved does not contribute to any energy transfer in the form of work.