Let's picture an empty sperical shell in inter galactic space or beyond. Inside this shell, a ball is rolling on the inner surface. Because of friction and the centrifugal force the ball exerts on the shell, the shell is acted on in two perpendicular direction. A radial and an angular direction.
I can't get a true grip on what happens. Will the ball eventually stop rolling, and the final situation be the sphere and ball rotating in concert around their center of mass?