calculate the moment of interia of a body of mass 100g revolving about axis in a circular path the center of mass of body is 25cm from axis of rotation
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Work done W=FScosθ
where θ is the angle between F and S.
If θ=90
o
⟹W=0
Thus the work done by a force will be zero if the object moves in a direction perpendicular to the direction of applied force.
Displacement of the body revolving in a circular path is along the tangent whereas centripetal force acts radially inwards i.e they are perpendicular to each other.
Hence, work done in this case by the centripetal force is zero.
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