Center of momentum

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The "center of momentum" of a system is not a point in space, but rather a particular inertial frame in which the center of mass is at rest, and the total linear momentum of the system is zero. Thus, the term is generally used in conjunction with the term "frame", as in "center of momentum frame" or COM frame. The center of mass frame, a less-preferred term for the same concept, refers to the fact that in the center of momentum frame, the velocity of the center of mass is zero. However, the center of mass of an object or system of objects is defined as point, independent of inertial frames.