Opinions on Center-of-momentum frame

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In physics, the center-of-momentum frame (zero-momentum frame, or COM frame) of a system is the unique inertial frame in which the total momentum of the system vanishes. The center of momentum of a system is not a location. Thus "center of momentum" means "center-of-momentum frame" and is a short form of this phrase.

A special case of the center-of-momentum frame is the center-of-mass frame: an inertial frame in which the center of mass (which is a physical point) remains at the origin. In all COM frames, the center of mass is at rest, but it may not necessarily be at rest at the origin of the coordinate system.

In special relativity, the COM frame is necessarily unique only when the system is isolated.


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