The analysis of the horizontal channel also suggests another
demonstration that is worth discussing briefly. If a superball
is thrown in the middle of a long horizontal channel,
it should be possible to see the ball move up and down the
channel once or twice before the ball loses so much energy
that it is unable to bounce against the upper surface. For this
demonstration to work well, it is necessary for the ball to
start with a high velocity so that it can undergo a number of
bounces and for the surfaces to be close to one another