Purpose:Illustrate weird rotational effects and to demonstrate transformation of gravitational potential energy into rotational energy.
Description:Begin by striking the plastic rings so that they wobble while rotating about the stick, then quickly bring the stick to a vertical position. The rings continue to wobble down the stick, increasing their angular and wobbling speed as they convert gravitational potential energy into rotational energy. When they reach the bottom, invert the stick to continue the process. Under the right conditions, the two rings may separate, then strike each other in a type of elastic collision.