2007-02-19 19:12:43 · 5 answers · asked by clars 1 in Science & Mathematics ➔ Physics
No, because momentum is never destroyed. If the ball strikes the earth, then the earth must move. The total momentum afterwards will be the same. But the bigger the mass, the less the speed for a given amount of momentum. The earth is so big that you don't notice the change in speed of the earth.
2007-02-19 19:29:19 · answer #1 · answered by Gnomon 6 · 0⤊ 0⤋
total momentum is always conserved, total momentum of the earth and ball right after the collision is Equal with their momentum right before the collision. So the momentum is not destroyed. The kinetic energy of the ball might decrease, momentum of the ball it self then will decrease. Total energy though always conserved, some may transferred to other form. Conservation of momentum and Energy are some of the basic rule of how this world works.
2007-02-20 04:47:50 · answer #2 · answered by nowo r 1 · 0⤊ 0⤋
The momentum conservation equation( Newton's second law's variant) does not take into account dissipative effects.
Some amount of momentum is destroyed when the ball hits the earth because of thermal dissipation, or simply heat. This rises entropy.
When momentum is exactly conserved without any dissipation, it is isentropic. But in reality, most processes are dissipative.
In view of the answer given below by Nowo, I would like to clarify my answer. Yes. He is right that momentum conservation is a fundamental law which always hold true. Its basically Newton's law with External Force = 0. And no arguing with Newton's laws.
What I meant was that for inelastic collisions, it is difficult to account for momentum completely. (just imagine two soft and spongy balls collide). So, we have an experimental value called "coefficient of restitution" to model the effects of dissipation. With this, you can apply momentum conservation law.
2007-02-20 04:46:48 · answer #3 · answered by novice 4 · 0⤊ 0⤋
Because of the striking force.
While mass remains unchanged (classical phyisics), force is the rate of change of momenturm with time. The geater the force, the faster the momentum dies out.
When the ball completely stops moving after it presses itself maximum against the ground, it has no momentum left. However, it may have acquired a significat potential energy in its elastic compression. And this potential energy may convert itself into kinetic energy to bounce the ball back hence building up some momentum of oposing direction.
2007-02-20 03:35:08 · answer #4 · answered by sciquest 4 · 0⤊ 0⤋
No,Becauese p=mv,there v not equal to zero when the ball strikes the earth.
2007-02-20 03:32:36 · answer #5 · answered by Anonymous · 0⤊ 0⤋