What is the work done by the force of gravity | vedclass

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(C) When a satellite moves around the Earth in a circular orbit,the gravitational force acts towards the center of the Earth (centripetal force).The d

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Zero

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(C) When a satellite moves around the Earth in a circular orbit,the gravitational force acts towards the center of the Earth (centripetal force).The displacement of the satellite at any instant is along the tangent to the circular path.Since the radius (direction of force) is always perpendicular to the tangent (direction of displacement),the angle $	heta$ between the force and displacement is $90^{\circ}$.The formula for work done is $W = F \cdot s \cdot \cos(	heta)$.Substituting $	heta = 90^{\circ}$,we get $W = F \cdot s \cdot \cos(90^{\circ}) = F \cdot s \cdot 0 = 0$.Therefore,the work done by the force of gravity on a satellite moving around the Earth is zero.

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

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