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propulsion
Propulsion is a means of creating force leading to movement. The term is derived from two Latin words: ''pro'', meaning'' before'' or ''forward''; and ''pellere'', meaning ''to drive''.〔(Beginner's Guide to Propulsion NASA )〕
A propulsion system consists of a source of mechanical power, and a ''propulsor'' (means of converting this power into propulsive force).
A technological system uses an engine or motor as the power source, and wheels and axles, propellers, or a propulsive nozzle to generate the force. Components such as clutches or gearboxes may be needed to connect the motor to axles, wheels, or propellors.
Biological propulsion systems use an animal's muscles as the power source, and limbs such as wings, fins or legs as the propulsors.
== Vehicular propulsion ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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