Center-of-momentum frame

In physics, the center-of-momentum frame (zero-momentum frame, or COM frame) of a system is the unique (up to velocity but not origin) inertial frame in which the total momentum of the system vanishes. The center of momentum of a system is not a location (but a collection of relative momenta/velocities). Thus "center of momentum" means "center-of-momentum frame" and is a short form of this phrase.

单词	Center of momentum coordinate system
释义	Center of momentum coordinate system 英语百科 Center-of-momentum frame In physics, the center-of-momentum frame (zero-momentum frame, or COM frame) of a system is the unique (up to velocity but not origin) inertial frame in which the total momentum of the system vanishes. The center of momentum of a system is not a location (but a collection of relative momenta/velocities). Thus "center of momentum" means "center-of-momentum frame" and is a short form of this phrase.
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Center of momentum coordinate system

Center-of-momentum frame