Use motor to spin up bicycle wheel
and hand
it to a volunteer on the rotating stool. Changing the
orientation
of the wheel axle will cause the person to rotate so that the
total angular momentum
of the system remains constant.
Or start out with the wheel and the
person at rest
on the stool with zero angular momentum. Spin up the
wheel by hand while
on the stool, then grab the spinning wheel to bring the system
to rest.
