262if angular velocity remains constant then only force is centripetal force , whose moment is zero
if angular vel. is changing then moment = F*r (F= m*atangential)
if a body is rotating in a circular orbit then what is the moment of net force acting on the body about the axis of rotation?
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3 Answers
262
36look at this question -
q) A mass of 2kg is rotating in a circular path of radius 0.8 m with an angular velocity of 44 rad/s. If the radius of path becomes 1.0 m, find the new angular velocity.
in the soln the book says
The angular momentum L of mass is conserved.
But how?
71It is because the torque that you are applying passes through the axis of rotation and hence Conservation of Angular Momentum holds here.