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在初三的物理课中,讲授《分子运动论的初步知识》一节的分子力时,由于没有分子,原子结构及电荷间相互作用的知识作铺垫,由铅块实验得出分子间引力的存在,和固体和液体很难被压缩的实例得出分子间斥力的存在,学生一般都能理解.但是讲到分子间引力和斥力同时存在并随分子间距离的变化而变化时,学生就很难理解.这就自然形成了这节课的一个难点.学生在不知道分子力作用机理的情况下,很难记忆课本所述内容,在知识条件局限下,用
In the third physics class, when the molecular forces in the section “Preliminary knowledge of molecular kinesiology” were taught, there was no molecular, atomic structure, and knowledge of the interaction between charges, and from the lead block experiment, the intermolecular gravitational force was obtained. The existence, and the fact that solids and liquids are difficult to compress, give rise to the existence of intermolecular repulsion, which students can generally understand. But when it comes to intermolecular gravity and repulsion that exist at the same time and change with the distance between molecules, students are very Difficult to understand. This naturally forms a difficult point in this class. Students do not know the mechanism of molecular forces, it is difficult to remember the contents of textbooks, under the limitations of knowledge, use