Question

What is the work done by centripetal force in moving a body through half cycle on circular path of radius $35cm$?

Answer 1

Since along the whole path of motion along the circle, the force is perpendicular to the direction of motion. The force is towards the center at each point while the body moves perpendicularly to it by moving on the circle.

$\therefore Work,W=\int \overrightarrow{F}.d\overrightarrow{s}=\int F\cos 90ds=0$