  We examine the dynamics of cylinders that are grooved to form N teeth for
rolling motion down an inclined plane. The grooved cylinders are experimentally
found to reach a terminal velocity. This result can be explained by the
inclusion of inelastic processes which occur whenever a tooth hits the surface.
The fraction of the angular velocity that is lost during an inelastic collision
is phenomenologically found to be proportional to
(2*sin^2*pi/N)-(alpha*sin^3*pi/N), and the method of least squares is used to
find the constant alpha=0.98. The adjusted theoretical results for the time of
rolling as well as for terminal velocity are found to be in good agreement with
the experimental results.
