The principle of conservation of momentum follows from Newton's second and third laws of motion.For every force there is an equal and opposite force, acting on a different object, so the force changing the momentum in one direction must be counteracted by a force in the opposite direction to ensure the total momentum is conserved.
Impulse = force × timeImpulse = F t = m(v - u)Impulse is the change in momentum which can be achieved by applying a force F for a given time t.Since Newton’s third law states that in a collision the forces acting on the two objects are equal but opposite and since the collision time is the same for both, the impulses on the objects are equal and opposite so the total impulse is zero.Impulse = change in momentum so there is no change in the total momentum
Impulse = force × timeImpulse = F t = m(v - u)Impulse is the change in momentum which can be achieved by applying a force F for a given time t.Since Newton’s third law states that in a collision the forces acting on the two objects are equal but opposite and since the collision time is the same for both, the impulses on the objects are equal and opposite so the total impulse is zero.Impulse = change in momentum so there is no change in the total momentum