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Re: Center-of-mass system



"Center of momentum" is to be preferred in general because it admits
relativistic particles to the system. "Center of mass" is certainly
the better way to introduce the concept in an introductory course.

Of greatest importance is that one should *never* allow the use of
"center of gravity"! There is no case where this atrocious construct
is more appropriate than "center of mass".

Leigh