Question

Define law of conservation of momentum.

Also give an example.​

Answer 1

Answer:

The law of conservation of momentum states that '' For collisions occurring between objects 1 and 2 , the momentum before collision is accurately equal to momentum after collision.

EXAMPLE:

There are 2 balls facing each other. The first one has its its own m1 (mass ) and v1  ( velocity ). The second ball has its m2 ( mass ) and v2 ( velocity ). As these two objects collide , we must take a closer look into Newton's third law of motion which states that '' for every action, there is an equal and opposite reaction''. So , during the collision, the balls exert force on each other. As the  forces are exerted by both the objects, the interaction or the time of collision must be equal.

                               F 1 = F 2  and T 1 = T 2

So, we must know that to produce acceleration, we must exert an external force , and, to produce momentum , we need impulse.

                              IMPULSE 1 = IMPULSE 2

                                    F 1 . T 1 = F 2 . T 2

Since, the balls are in equal magnitude and impulses ( change in momentum ), we can prove that the TOTAL MOMENTUM BEFORE COLLISION IS EQUAL TO THE TOTAL MOMENTUM AFTER COLLISION.