Question

A body is moving in a circular path of radius 'r'. The work done by tangential force 'F' in one revolution is (A) F.21 (B) F.2r (C) F.r (D) Zero​

Answer 1

Answer:

The answer is D) zero

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Answer 2

D) work done by tangential force 'F' will be 0.

We are given that F force is acting tangentially on the body which is moving in a circular path.

Considering any point on the circumference of the body, F will be forced on it and in one revolution it will cover the displacement covered will be 2πR

But the direction of the tangential force and the displacement covered will be in the same direction

W = F.S= FScosθ

here in this case θ=0

Therefore, work done by tangential force 'F' in one revolution is D) 0.