The oscillation decays exponentially, as seen in Figs. 7(a) and 7(b), and is a function of the tangential restitution, not the moment of inertia. The frequency of oscillation is affected only weakly by the tangential restitution and is approximately equal to the oscillation of the fully elastic ball.
As________decreases,these is a point where ________ The motion at this point can, following the analogy with the damped oscillator, be considered critically damped and the critical restitution. coefficient is related to the moment of inertia by