why does the gun recoil when a bullet is fired from it?
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Answer:
When a bullet is fired from a gun, the gun exerts a force on the bullet in the forward direction. The bullet also exerts an equal and opposite force on the gun in the backward direction. ... Therefore a gun recoils when a bullet is fired from it.
NEWTON'S 3RD LAW OF MOTION.
EACH AND EVERY REACTION HAS ITS OPPOSITE AND EQUAL REACTION.
In this case same happened.
the propellent of the bullet exert force on the metal as well as on the gun which r Equal and opposite to each other but don't cancel eachother bez acting on Different bodies.
the force applied on the metal part of bullet is the action force and force on the gun is the reaction force.
this can also explained by the law of conservation of linear momentum. as the system was at rest so it's center of mass must be at rest during firing. so gun moves back and bullet move in front to make center of mass at rest !