Question

A gunman, while firing a bullet, should hold the gun tight to his shoulder. Why?

Answer 1

1. A gunman, while firing a bullet, should hold the gun tight to his shoulder because when a bullet is fired from a gun, the force sending the bullet forward (action) is equal to the force sending the gun backward (reaction).
2. But the mass of the gun is more than the mass of a bullet, so it moves only a little distance backwards and gives a backward jerk on the shoulder of the gunman.