Q35. State with reasons whether work is done or not in the following cases.
a) A man holding 40 kg over his hand.
b) Work done by the force of gravity on a satellite moving around earth.
c) A body moving in circular orbit.
Il Give reason:
a) Driver speed up his vehicle when he moves up a hill.
b) Flying bird has Potential and Kinetic energy.
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Velocity, Acceleration and Force Vectors
The motion of an orbiting satellite can be described by the same motion characteristics as any object in circular motion. ... This centripetal force is supplied by gravity - the force that universally acts at a distance between any two objects that have mass.
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