What is the work done by a satellite moving around the earth ?Justify your answer.
The work done over the complete orbit would be zero not because the angle between F and s is 90, it never is. This is because the displacement would be zero as the satellite returns back to its starting position
when a satellite moves around the Earth along a circular path,then the force of gravity acts on it towards the centre.
the force of gravity of the earth and the direction of movement of the satellite are perpendicular to each other.
therefore W=FORCE(DISPLACEMENT)(Cos 900).
therefore work done=0J.