Recoil is the backward momentum of a cannon when it is discharged. The recoil of the cannon is made equal to the forward momentum of the cannonball. The firing of the cannonball produces a lot of force that is transmitted to the ground. This recoil of the cannon is equal to the mass of the cannon multiplied by its velocity. This principle of conservation of momentum (Newton's Second Law) help to maintain the position of the cannon on the ground after firing.