动力学问题是高中阶段重点研究的一个问题,在高考中涉及很广。在研究此类问题时,学生都知道需要结合受力分析和运动分析,进而选择常用物理规律建立物理方程,如牛顿第二定律,动能定理等;对于较为基础的模型,如单个物体的单过程问题,学生尚能应付,但对于相对复杂的模型,如系统问题,多过程问题,不少学生思维易出现混乱,甚至无从下手。究其根源,我们还需回归物理本质。动力学中 Kinetic problem is a key issue in high school stage, involving a wide range of entrance. When studying such problems, students all know that they need to combine force analysis and motion analysis, and then choose common physical laws to establish physical equations such as Newton’s second law and kinetic energy theorem. For more basic models, such as a single process of a single object Problem, students can still cope with, but for relatively complex models, such as system problems, multi-process problems, many students prone to confusion, or even start with. The root causes, we also need to return to the physical nature. Kinetics