物理学是一门严格的定量科学。在中学物理教材中,绝大部分内容给出了定量规律,但也有相当一部分内容,限于教材和大纲的要求,只作了定性研讨,不能给出定量结果。从教学过程看,定量知识推理性、说理性较强,应用起来有式可循,容易讲清,学生容易信服;而定性知识概念性较强,学生感觉抽象,不易掌握,难于应 Physics is a rigorous quantitative science. In the middle school physics textbooks, most of the contents give quantitative laws, but there are also a considerable part of the content, limited to the requirements of textbooks and outlines, only made qualitative discussions, can not give quantitative results. From the perspective of the teaching process, quantitative knowledge is reasoned and reasoned stronger. It is easy to clarify and apply to students and students are easy to convince; while qualitative knowledge is more conceptual, students feel abstract, difficult to master, and difficult to apply.