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
A)zero
B)FR
C)F$\pi$R
D)2FR
E)2$\pi$R

Question

Quizplus · Accepted Answer

The work done by a radial force is zero because the force is always perpendicular to the direction of motion, and work is calculated as the dot product of force and displacement, which is zero for perpendicular vectors.

A Particle Moves Halfway Around a Circle of Radius R π\piπ

A Particle Moves Halfway Around a Circle of Radius R $\pi$