运动的叠加原理表明,一个物体若同时参与几个各自独立的运动,物体的运动是上述各运动的叠加(即矢量相加)。叠加原理可以应用于在一段有限时间过程中位移的合成,也可以应用于某一瞬时速度的合成。叠加原理不仅适用于运动的合成,还经常应用于运动的分解,即可以把一个位移矢量(或速度矢量)按平行四边形法则(正交或非正交)分解为两个或多个分位移(或分速度)矢量。两个或多个分矢量的合成,其 The superposition principle of motion shows that if an object participates in several independent motions at the same time, the motion of the object is the superposition of the above motions (that is, vector addition). The principle of superposition can be applied to the synthesis of displacements over a finite period of time, as well as to the synthesis of certain instantaneous velocities. The principle of superposition applies not only to the synthesis of motion, but also to the decomposition of motion. It is possible to decompose a displacement vector (or velocity vector) into two or more sub-displacements according to the parallelogram rule (orthogonal or non-orthogonal). Or speed vector). Synthesis of two or more subvectors, which