Reciprocating motion
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Reciprocating motion is a back and forth (or an up-and-down) motion which repeats over and over again. For example, the explosion inside the cylinder of an internal combustion engine pushes the piston down and the connecting rod pushes the crankshaft round, which in turn drives the wheels of the car. A Crank (mechanism) can be used in two ways, to turn circular motion into reciprocating motion or turn reciprocating motion into circular motion.
