Moon revolves around the earth due to gravitational force $(F)$ of earth on moon. The work done by the gravitational force is $(r=radius\ of\ circular\ orbit\ of\ moon)$:

1. $F.2\pi r$
2. $F.\pi r$
3. zero
4. negative work

The moon revolves around the earth due to the gravitational force $(F)$ of the earth on the moon. The work done by the gravitational force is zero because the direction of the displacement $(motion)$ is perpendicular to the direction of the gravitational force of the earth. And we know work done $W=Fd\cos\theta$, here $\theta=90^{\circ}$, and $\cos90^{\circ}=0$.. so $W=0$.

Therefore, option c). is correct. 

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Updated on: 10-Oct-2022

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