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The Earth moving round the Sun …

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The Earth moving round the Sun in a circular orbit is acted upon by a force, and hence work must be done on the Earth by this force. Do you agree with this statement?
  • 1 answers

Preeti Dabral 1 year, 8 months ago

The statement is wrong. The earth moves around the sun because of the gravitational force of the sun on the earth. This force acts along the radius of the orbit of the earth towards its center. At every point during the motion, the the direction of velocity (or direction of displacement) is always perpendicular to the force. 
Thus, {tex}\theta {/tex} = 90o and
Work done, W = FS cos {tex}\theta {/tex}  =  FS cos90° = 0.
Hence, sun does no work on earth.

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