This is caused because of Newton’s Third Law of Motion, which is that all actions have an equal and opposite reaction. The propellant explodes and sent the bullet flying forward. Because of Newton’s law, the gun comes back with an equal momentum as the bullet has moving forward. So why does the gun not go through your arm? It is because, while the bullet has great momentum, it is because of its speed, since the gun is heavy and has its impact over the whole of the shoulder with the use of the stock; it means the momentum is spread out unlike the small point of the bullet
This is caused because of Newton’s Third Law of Motion, which is that all actions have an equal and opposite reaction. The propellant explodes and sent the bullet flying forward. Because of Newton’s law, the gun comes back with an equal momentum as the bullet has moving forward. So why does the gun not go through your arm? It is because, while the bullet has great momentum, it is because of its speed, since the gun is heavy and has its impact over the whole of the shoulder with the use of the stock; it means the momentum is spread out unlike the small point of the bullet