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A rotating disc, Fly Wheel is used for storing device for kinetic energy. Fly wheels resist any changes which occur in their rotational speed which in turns keep steady the rotation of the shaft at the time of exerting of fluctuating torque on it by its power source such as a piston-based (reciprocating) engine, or when the load placed on it is intermittent (such as a piston pump). These can be used for producing very high power pulses, required for doing some experiments where drawing the power from the public network would produce unacceptable spikes. Presently, fly wheels have become the subject of extensive research as power storage devices, to be used in vehicles.

In recent times, a momentum wheel is used as the fly wheel type in satellite pointing operations, where it is used for pointing the satellite's instruments in the right direction without the thruster rockets. Fly wheels are also used in the punching machines and riveting machines for storing energy from the motor.