Principles of Science: Centripetal Acceleration, Conservation of Angular Momentum

Stand up straight on the spinner, hold on firmly, and push off with one foot. Hold on to the pedestal, move your legs in and out, and observe how the speed changes. The spinning of the Orbiter eventually slows and comes to a stop because the energy is slowly transformed into heat through friction.

When an object is spinning around an axis, angular momentum is conserved. This means as mass is moved closer to the axis of rotation, the rate of rotation, or speed, must increase so that the angular momentum stays the same.
A high diver knows how to control his/her rate of rotation by tucking more tightly. Atoms, planets and galaxies conserve angular momentum, too.