Flywheels

thumb|250px|right|A gyroscope thumb|right|A gyroscope in operation, showing the freedom of rotation in all three axes. The rotor will maintain its spin axis direction regardless of the orientation of the outer frame.

thumb|Richard Trevithick|Trevithick's 1802 steam locomotive, which used a flywheel to evenly distribute the power of its single cylinder

automotive brake energy system

mechanical system having rotational kinetic energy

flywheel that consists of two lighter flywheels connected by a damping mechanism