Hello. Suppose I have a coordinate system with the origin at the center of mass at rest of some rigid object and I wish to calculate the total change in angular momentum of the object with respect to it's center of mass. If I apply a torque to the object, that also happens to be an unbalanced force, the object will move in the direction of the force and as a result the center of mass will no longer be on the origin. So now the torques will be calculated with respect the original origin and not the c.o.m. . I can't see a way to reconcile this because following the center of mass for my reference system would result in a non inertial frame. Is the only way to do this calculation is to use this frame and then switch to the center of mass frame after the calculation is over to determine it's final angular momentum?