Question

what is the work done by the force gravity on satellite moving around the earth. justify?

Answer 1

no work done .... as gravity does not act on the satellite. .. no effect of gravity on satellite take place

Answer 2

Answer: The work done by the force gravity on satellite moving around the earth is zero.

Explanation:

The expression for the work done is as follows;

$W=Fscos\theta$

Here, F is the force, s is the displacement and $\theta$ is the angle between the force and displacement.

When the satellite moving around the earth then angle between the force and the displacement is 90 degree as the force of gravity of the earth on the satellite and the displacement are perpendicular to each other.

Put $\theta$=90 degree in the expression of the work done.

$W=Fscos90\degree$

$W=0$

Therefore, the work done by the force gravity on satellite moving around the earth is zero.