system
Given the following post, respond as if you're commenting on Reddit:
human
A question about particle collisions

In a collision between two different particles (for example, a proton and a neutron) moving at different velocities, is there a difference in the outcomes between a faster moving proton hitting a slower moving neutron? Or vice versa?
gpt
You have to remember that all motion is relative. If, in one frame of reference, there is a fast proton hitting a slow neutron, then there is another frame of reference in which the neutron is fast and the proton is slow. We can conclude from this that there cannot be any difference in the outcomes of the two scenarios (except, possibly, the velocities of whatever particles we end up with). Typically, particle physicists work in a frame in which the center of gravity of the system is at rest.