In this paper, the dynamic characteristics and laws in the centroid reference system are summarized, and the special position of the centroid system and the superiority of using the centroid system to study dynamic problems are explained.

Keywords: Centroid Momentum Centroid Kinetic Energy Relative Kinetic Energy

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The center of mass is the weighted average position of the mass T distribution with the mass sub as the weight in the particle group, which is a special point in the particle group. Because the motion of the center of mass reflects the characteristics of the whole motion of the particle group, the dynamic phenomena and laws in the center-of-mass system have a series of special and important properties, and the center-of-mass reference system occupies a special position in the study of dynamic problems, so theorists adopt Changle. 1 centroid reference system.