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Work Done by Centripetal Force

The work done by centripetal force is always zero as it is perpendicular to velocity and hence instantaneous displacement (Fig. 2).
 
37469.png
Fig. 2
 
Work done = Increment in the kinetic energy of revolving body
= 0
 
Also, W = 37054.png = F ⋅ S cosθ = F ⋅ S cos 90° = 0




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