Brake
The kinetic energy lost by the moving part is usually converted into heat by friction. There are also regenerative braking systems that store some of the energy in a flywheel or capacitor, or convert it to electricity to store in a battery or send to some other machine. The first braking systems were used on horse-drawn vehicles. The horse accelerated the cart to relatively high speeds and could not cope with its stopping by itself. The first mechanisms braked the wheel itself by means of a manual lever or a system of levers.