# Questions tagged [collision]

Interaction between two or more bodies that results in physical contact and an exchange of momentum between the bodies involved.

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### Why is the laboratory frame energy always greater than the center of mass frame energy for collisions? [duplicate]

I looked through lots of sources to answer the question, 'Why is lab frame energy (total energy) always greater than the center of mass frame energy?' Many of them provided lots of mathematical ...
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### Why is the laboratory frame energy always greater than the center of mass frame energy?

I have been looking for an answer to 'Why is the laboratory frame energy always greater than the center of mass frame energy during collisions?'. A lot of resources provided mathematical explanations....
70 views

### Can you anti-dot? (9-22 from Marion Thorton) [closed]

I'm solving a question out of the textbook and it reduces to the following. a particle of mass 2m with velocity $v_0$ collides with a particle of mass m at rest. The collision is elastic. So using ...
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### A rotating solid bar in space [closed]

Say there is a solid bar in space. Imagine it vertically, with the top point labeled $A$, and the bottom point labeled $B$ (these aren't points on the bar, but points in space between which the bar ...
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### How is momentum conserved in this example? [duplicate]

Suppose a sticky substance is thrown at wall. The initial momentum of the wall and substance system is only due to velocity of the substance but the final momentum is 0. Why is momentum not conserved?
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### How did the Moon get into orbit?

It's the accepted theory that Moon was formed when an object collided with Earth, throwing off a lump of matter which became the Moon. But also, an object cannot be launched into orbit from a planet ...
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### Why the rubber ball bounced higher than the glass ball?

For a teaching degree we did the following experiment: Drop a rubber and a glass ball of approx. same size from approx. same height onto laminate flooring. As we expected, the rubber ball bounced ...
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### Is the “center-of-mass energy” in particle physics related to the center-of-mass frame or not?

For collision of particles the invariant quantity "center-of-mass energy" is defined, as done here. Since it is an invariant quantity it does not depend on the frame of reference chosen. So the name "...
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### Bouncing ball with friction

I am trying to write freefem code (same language as c++) for a bouncing ball, but i am not able to notice the result of friction force. At each time the rigid ball hits the rigid ground , the ...
575 views

### How come I can kick a football further when it's moving towards me?

If a ball is moving towards me, I can kick it further than if I were to kick it if it was stationary. But surely if the ball is moving in the opposite direction, it should take more force to kick it ...
67 views

### While throwing a ball up in the air it doesn't hurt but when it comes back at same altitude it hurts why?

While throwing a ball up in the air it doesn't hurt but when it comes back at same altitude it hurts why? Well have the same amount of momentum in both of the cases. Then why does it hurt when it ...