Question

The work done by the force of gravity on a satellite moving around the earth is zero.

• A. True
• B. False
• C. Ambiguous
• D. Data insufficient

Answer 1

The correct option is A True

When a satellite moves around the Earth in a circular path, then the force of gravity acts on it directed towards the centre. 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. Therefore, net work done $=F.S.cos{90}^0=0$. That is, the work done by the force of gravity on a satellite moving around the Earth is zero.