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Work And Energy — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceWork And Energy1 Mark
Question
When is work done by a force zero?
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Answer

If the displacement is perpendicular to the direction offorce or if it is zero then work done is equal to zero. So work done by the sun on earth is zero since centripetal force is perpendicular to the motion of the earth.

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