力和能量是高中物理的两条线索,从能量的观点分析问题,可以抛开物理过程的具体形式,抓住问题的本质,但由于抽象和对过程缺乏认真的分析,学生非常容易忽略某一短暂过程的能量变化,在分析和解决问题中出现错误.例1 如图1所示,A、B 两物体的质量分别为 Strength and energy are two clues to physics in senior high schools. Analyzing the problems from the energy point of view, we can put aside the concrete forms of the physical processes and grasp the essence of the problems. However, due to abstraction and lack of careful analysis of processes, students are very easy to ignore Transient energy changes in the process of analyzing and solving the problem. Example 1 As shown in Figure 1, the mass of A and B are