a basket player jumps up to "shoot" a basket.is momentum conserved?

Question

(a) yes,but only if you chose the correct system
(b) yes, but only in the horizontal direction
(c) no, because the velocity of tfhe basketball player chanlges with time.
(d)it is a bad question,because momentum conservation is for objects moving at constant speed,and the basketball player is accelerating.

Answer 1

Technically, the answer is (a). This is because if you choose the player as your system, you will see that the total momentum is different after the player jumps, because the earth "exerted" a force on the player. Do not confuse this with the "law of conservation of momentum" being violated, however. Since in this case, there is an external force acting on the system, momentum does not have to be conserved. Make sure to talk to your teacher if you need clarification on this point. This concept is a very important one, and you shouldn't let a silly question like this confuse you on the basic ideas.

Quote from below:
"Um, momentum conservation can only happen to constant values, so d could be true."

This is not true. Momentum is conserved depending only on what system you consider. For example: in a collision of two objects moving at constant velocities towards one another, the total momentum of the 2 object system is the same after the collision as it was before the collision and is the same at all times during the collision as well. Even while the objects are undergoing accelerations during the collision, the TOTAL momentum stays the same. However, if you take only one of those objects as your entire system, then the momentum can clearly change. Conservation of momentum does not get thrown out the window just because there is an acceleration.

Also, for those that say (b) is the correct answer, you have to consider the fact that you can choose the boy, the earth, the ball and everything around him as your entire system. In this case, momentum is conserved.

Answer 2

Um, momentum conservation can only happen to constant values, so d could be true.

Then again, if they were to be moving at constant speeds, than yes momentum is conserved because the momentum lost from the player is gained by the basketball which would be a.

Answer 3

Answer: (b)

In the vertical direction gravitational force will be acting hence changing the momentum, in the horizontal direction the ball and player are not acted upon by any external force hence momentum will be conserved.
(m1+m2)v=m1v1+m2v2 (only horizontal components)

Answer 4

the answer is a)
any question that ends with "is momentum conserved?" is correctly answered "yes". Momentum is always conserved.

Answer 5

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Answer 6

momentum is never lost nor created remember? conservation of momentum right? or am i mistaken?

Answer 7

Energy (not momentum)

Answer 8

b