初中物理教学中常要解答各类问题,其中有一类问题有这样一个共同点,就是题中包含的物理过程不止一个,有的题中物体所处的状态不是静止不动的,而是动态的.这类问题中与物理过程相联系的物理量大多要发生变化形成变量,这样就增加了解 In junior high school physics teaching, it is always necessary to answer all kinds of questions. Among them, one kind of question has such a thing in common that there are more than one physical process involved in the question. In some questions, the status of the object is not static but dynamic. Most of the physical quantities associated with physical processes in such problems are subject to change to form variables that increase understanding