Question

a child throws a ball in a net where it gets stuck. Does the motion of this ball defy the law of conservation of momentum?

Answer 1

First of all, do you have any ideas whether this follows the law or not?

Answer 2

are you there? O.o

Answer 3

Remember that the law of conservation of momentum states that "the total initial momentum of a SYSTEM is ALWAYS EQUAL to the final total momentum of the system" . In other words MOMENTUM of a SYSTEM is always conserved.
\(\LARGE p_t=p_t\ '\\p_1+p_2=p_1\ '\ + p_2\ '\ \)

where \(p=mv\).

In this case, the objects that are included in the system are the BALL and the NET.

Answer 4

The initial momentum of the system is equal to the initial momentum of the ball since we are considering that the net is at rest before the ball hits it. The total final momentum of the system is equal to the SUM of the final momenta of the ball and the net. According to the law, initial momentum of the system = total final momentum.

Hope this helps!

Answer 5

Thanks a lot! so the motion of the ball would not defy the law of conservation of momentum because the initial momentum of the system (the ball and net) is equal to the total or sum of the final momentum right?

Answer 6

Yes! you got it ;)