Question

What is the work done by the force of gravity on a satellite moving around the Earth? Justify your answer.

Answer 1

When a satellite moves around the Earth in a circular path, then the force of gravity acts on it directed towards the center. The motion of the satellite is in the horizontal plane. Therefore, the force of gravity of Earth on the satellite and the direction of motion of satellite are perpendicular to each other.

Answer 2

┏─━─━─━─━∞◆∞━─━─━─━─┓ ✭✮ӇЄƦЄ ƖƧ ƳƠƲƦ ƛƝƧƜЄƦ✮✭ ┗─━─━─━─━∞◆∞━─━─━─━─┛

The satellite moves around the earth in a circular path.

The gravitational force of the Earth is the centripetal force.

Then at every point of the circular orbit, centripetal force act on the satellite at right angles to the direction of motion of the satellite, θ = 90º.

We Know, W = F s cos θ
           = F s cos 90º
           = F s (0)
           = 0 ...✔

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Thanks...✊