Question

A body of mass 2kg is moving in a circular path of radius 2m. How much work is done on the body?

Answer 1

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"Zero" is answer.

➡ The body will return to the same position where it started.
So, work done will be 0.

Answer 2

The work done on the body is 0.

Explanation:

Given that,

Mass of the body, m = 2 kg

radius of the circular path, r = 2 m

We need to find the work done by the body. We know that when an object moves in a circular path, the work done is given by :

$W=Fd\ \cos\theta$

$\theta$ is the angle between force and displacement

On a circular path, the angle between velocity and the displacement is 90 degrees. So, the work done is :

$W=Fd\ \cos(90)\\\\W=0$

So, the work done on the body is 0. Hence, this is the required solution.

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Work done

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