The center of mass (COM) of an object or a system is the point where, for certain purposes, its mass can be considered concentrated. It's the average position of all the mass in a system or an object. In a uniform gravitational field, the center of mass coincides with the center of gravity. For a system of particles or objects, the center of mass is calculated by finding the weighted average of the positions of all the individual masses, taking into account both their masses and their respective

CCNAネットワーク基礎講座「CSMA/CDって何？」