Suppose we have a rigid body that rotates around a point P other than its center of mass, with point P being a point of the rigid body. This implies that there are external forces to the rigid body. If the external forces cease to exist(like we have an axis passing through P and we suddenly remove the axis) the center of mass will move in a straight line. Will the CoM become the new center of rotation of the rigid body? if yes what happens to the angular momentum, will it remain the same though we ll have a new center of rotation?