恒力的功与路径有关吗?滑动摩擦力能否作正功?在非惯性系内物体的动能定理如何应用?等等,这些问题涉及功的计算和对功、能关系中基本理论的理解问题,学生学到这部分知识时也感到模糊,因此就如何结合教材理解这些问题谈谈我的意见。 Is the power of the constant force related to the path? Can the sliding friction work positively? How does the kinetic energy theorem of the object in a non-inertial system apply? Etc. These issues involve the calculation of the work and the understanding of the basic theory in the relation between work and energy. Problems, students also feel vague when they learn this part of the knowledge, so talk about my opinions on how to combine the teaching materials to understand these issues.