Center-of-momentum frame | Wikipedia audio article
Channel: wikipedia tts
Date: 24/12/2018

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Center-of-momentum_frame


00:00:49 1 Properties
00:00:58 1.1 General
00:04:04 1.2 Special relativity
00:06:08 2 Two-body problem
00:18:33 3 See also



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SUMMARY
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In physics, the center-of-momentum frame (also 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.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 is not necessarily at the origin of the coordinate system.
In special relativity, the COM frame is necessarily unique only when the system is isolated.