转化是解决问题的重要策略。物理解题的过程,从本质上讲,就是将复杂的、难解的或陌生的问题转化为简单的、容易的或熟悉的问题。本文就此举例说明。1动转化为静机械运动的描述是相对的,我们说某物体是处于静止还是运动,或者做什么类型的运动,总是相对于一定的参考系而言的。通常情况下,我们取大地为参考系,但对于运动学中的相遇与追赶问题,若取某一运动的物体为参考系,可以将研究对象变二为一,从而使解题更为简捷。例1甲、乙两质点同时开始在同一水平道 Conversion is an important strategy for solving problems. The process of object comprehension is, in essence, the transformation of complex, difficult or unfamiliar issues into simple, easy or familiar issues. This article illustrates this. The description of a moving to static mechanical motion is relative. We say whether an object is still or moving, or what type of exercise is always relative to a certain frame of reference. Usually, we take the earth as the reference system, but for the encounter and catch-up problem in kinematics, if we take a moving object as the reference system, we can change the research object into two, so that the problem can be solved more simply. Example 1 A and B two particles simultaneously started at the same level