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A rocket engine is not like a conventional engine.  A conventional engine ignites fuel which then pushes on some pistons, and it turns a crank.  Therefore, it uses rotational energy to turn the wheels of the vehicle.  Electric motors also use rotational energy to turn fans, and spin disks.  A rocket engine does not use rotational energy to run.  They are reaction engines.  The principle of it is that the fuel contained within the body of the rocket goes through a chemical reaction as it comes out of the end of the rocket.  This reaction then causes thrust and propels the rocket forward.  This is an example of one of Sir Isaac Newton's fundamental laws.  "For every action, there is an equal and opposite reaction" (How Rocket Engines Work.)                                  ...