Engine (such as pneumatic motors), springs (clockwork motors) and elastic bands. Historic military siege engines included large catapults, trebuchets, and (to some extent) battering rams were powered by potential energy. A pneumatic motor is a machine that converts potential energy in the form of compressed air into mechanical work. Pneumatic motors generally convert the compressed air to mechanical work though either linear or rotary motion. Linear motion can come from either a diaphragm or piston actuator, while rotary motion is supplied by either a vane type air motor or piston air motor. Pneumatic motors have found widespread success in the hand-held
Mabuchi Motor is the number of rotations per minute of the motor shaft when voltage is applied between the terminals with no load to the motor. No-load current is the current discharged when voltage is applied between the terminals with no load to the motor. Stall torque is when the motor rotation stalls upon increasing the load to the rotating motor, while stall current is when the motor rotation stalls upon increasing the load to the rotating motor. The physics formula E = M (electrical energy input equals mechanical energy output) demonstrates the conservation of energy principle at work in a Mabuchi