Question

In case of circular motion of a body, if tangential force also acts on the body in addition to centripetal force, then work done:

• A. by tangential force is zero by work done by centripetal force is not zero.
• B. by centripetal force is zero but work done by tangential force is not zero
• C. by both the forces is positive
• D. by both the forces is zero

Answer 1

Answer: (B)

Since there is no displacement along radius vector hence work done is zero by centripetal force, but for tangential force there is displacement $=2\pi R,$ so work done is not zero.