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recoil
Recoil, in common everyay language, is considered the backward kick or force produced by a gun when it is fired. In more precise scientific terms, this force is equal to the time derivative of the backward momentum resulting when a gun is fired.
Trivia about recoil
To spring back upon firing
An example of the conservation of momentum in action is this felt by a person who fires a gun
(Sofia of the Clue Crew fires a shotgun out in the hills.) Newton's third law of motion explains why this 6-letter reaction happens after I discharge the gun