Hi, I've read about the balancing of rotating masses. In the context every author(even J.E.Shigley in his book Theory of machines & mechanisms) mentions that a rigid body while rotating, it experiences a "Centrifugal Force" . Now we know that centrifugal force is a pseudo force when we analyze the motion of the body when our co-ordinate system is attached to the body. In other case when we analyze the motion of the body when our co-ordinate system is attached to earth (inertial reference frame) there wouldn't be any centrifugal force which would then be unbalanced. So, whether the body is balanced or not depends on our selection of reference frame. I don't think that a centrifugal force is the cause of unbalance though the magnitude of unbalanced force equals/resembles that of a centrifugal force. So,which is the force then responsible for imbalance? Detailed analysis would be appreciated. Thanks in Advance.