学生在求解物理问题时,肯定要运用相关的物理规律列出具体的式子。在列式时,他们首先要考虑的是研究对象问题,也就是对谁列方程,用物理语言来说就是此物理问题中所涉及的系统,系统中有几个物体。当存在两个及两个以上的物体时,研究对象的正确选取,关系到解题过程的简单与繁 When solving physical problems, students must use relevant physical laws to list specific formulas. In the column, the first thing they have to consider is the object of the study, that is, who is the equation. In terms of physical language, this is the system involved in this physical problem. There are several objects in the system. When there are two or more objects, the correct selection of the study object is related to the simplicity and complexity of the problem solving process.