A body that moves with a constant speed in a circle
A)experiences no acceleration.
B)undergoes no change in velocity.
C)has no resultant force acting on it.
D)has no work done on it.
E)is described by all of these.

Question

Quizplus · Accepted Answer

When a body moves in a circle at constant speed, it is undergoing uniform circular motion. Although the speed is constant, the direction of the velocity changes continuously, meaning there is a change in velocity and thus an acceleration towards the center (centripetal acceleration). This acceleration implies a net force acting towards the center (centripetal force). However, since this force acts perpendicular to the direction of motion, no work is done as work is defined as the force component in the direction of motion times the distance moved, and in this case, the angle between force and displacement is 90 degrees, making the work done zero.

A Body That Moves with a Constant Speed in a Circle