1) a free rigid body is not obliged to have a fixed axis of rotation;Summary:: Conceptual question on rotation.
Why do unconstrained objects always rotate about the lines passing through their CMs when tangential forces are applied to them? I understand that if an object does not rotate about its CM, th
2) instantaneous axis of rotation is not obliged to pass through the center of mass.
All these things can change from one inertial frame to another one.