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所谓等效变换,就是在保证效果相同的前提下,采用适当的变换,使复杂问题简化的一种方法。等效变换在中学物理教材中占有相当重要的地位。几个力同时作用于一个物体,物体的运动状态如何确定?通常是先把这几个力等效变换成一个力,或把这里的每一个力等效变换成给定方向上的几个力,即合力和分力,然后再确定物体的运动状态。几个力简化成一个力或一个力分解成几个力的方法,就是力的等效合成和分解。运动学中研究了物体的匀加速直线运动、竖直上(下)抛运动、平(斜)抛运动等许多不同形式的运
The so-called equivalent transformation, is to ensure the same effect on the premise, the use of appropriate transformation, a method to simplify complex issues. Equivalent transformation plays a very important role in middle school physics textbooks. When several forces act on an object at the same time, how can the motion state of the object be determined? Usually, these forces are firstly equivalently transformed into one force, or each force here is equivalently transformed into several forces in a given direction. , that is, force and force, and then determine the state of motion of the object. The method of simplifying a force or a force into several forces is the equivalent synthesis and decomposition of force. In kinematics, many different forms of transport, such as uniform acceleration linear motion, vertical upper (lower) throwing, and flat (tilted) throwing, have been studied.