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The centre of mass (or centre of gravity) of a set of points.  In the dynamics of a rigid body, the forces acting may be resolved into those displacing the body as a whole, which may be considered as acting at the centre of mass, and rotational forces.  For example, a rigid body moves under the influence of gravity as if its mass were concentrated at the barycentre.  Geometrically, the barycentre is at the [[centroid]] of the body.

See [[Barycentric coordinates]].

====References====
* Woodhouse, N.M.J. ''Introduction to analytical dynamics'' Clarendon Press (1987) {{ISBN|0-19-853198-2}} {{ZBL|0608.70001}}

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