Recoil refers to the backward movement of a firearm when it is fired, caused by the equal and opposite reaction force exerted on the gun by the bullet according to Newton’s third law of motion.
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Recoil refers to the backward movement or kick experienced by a firearm when a projectile, like a bullet, is expelled during firing. This phenomenon is a direct consequence of Newton’s Third Law of Motion. As the gun expels the bullet forward (action), an equal and opposite force acts on the gun in the backward direction (reaction). The expelled gases propelling the bullet generate a force that, per Newton’s law, induces a recoil force on the gun. This action-reaction pair illustrates the law’s principle: every force has an equal and opposite counterpart, in this case, between the gun and the fired projectile.