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Question

# Consider a planet moving in an elliptical orbit around the Sun. The work done on the planet by the gravitational force of the Sun.

A
Is zero in any small part of the orbit
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B
Is zero in some parts of the orbit
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C
Is zero in complete revolution
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D
Is zero in no part of the motion
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Solution

## The correct options are B Is zero in some parts of the orbit C Is zero in complete revolutionIn some parts of the orbit, force is perpendicular to the direction of motion. Hence, no work done when rotating in circular orbits. Also total amount of work in complete revolution is zero. Because when moving away the component of gravitational force is opposite to the direction of motion So, negative work is done. In some part positive work is done. As both are symmetrical. Total work done is zero.

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