Chapter - 4 Work and Energy

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Q
Work and Energy

Question:

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

Answer:

When the direction of force is perpendicular to displacement, the work done is zero. If a satellite moves around the Earth the direction of force of gravity on the satellite is perpendicular to its displacement. Therefore, the work done on the satellite by the Earth is zero.


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