A particle moves halfway around a circle of radius R. It is acted on by a radial force of magnitude F. The work done by the radial force is

W = 0 J

Explanation:

given,

radius of the circle = R

Radial force acting = F

Work done by the radial force = ?

Motion of a particle is in tangential direction where as force acting is radially inward.

The angle between the force and displace is 90°

now,

Work done = F. s cos θ

W = F s cos 90°

we know, cos 90° = 0

hence, W = 0 J

The work done by the radial force is equal to zero.