正数与负数,原本是数学中用于表示大于零和小于零这两种相反的数。在千变万化的物理世界中,正好存在许多相反的现象和过程,它们作为矛盾的两个方面同时存在,决定着物理世界的发展和变化。这些矛盾和变化,为正、负数的应用开拓了一个广阔的空间,其意义不再局限于大与小的比较,而外延至表示任意两种相反的物理情景,使之展现出多姿多彩的丰富内涵,也为物理量的表达提供了一种重要的、简捷的方法,使一维矢量运算代数化。在教学实践中发现,学生对物理量的正负意义及运算规律掌握不好,究其原因,一是正、负量作为一个知识点在教材中出现的 The positive and negative numbers were originally used in mathematics to denote two opposite numbers greater than zero and less than zero. In the ever-changing physical world, there are exactly the opposite phenomena and processes that exist simultaneously as two aspects of contradiction, which determine the development and changes in the physical world. These contradictions and changes have opened up a vast space for the application of positive and negative numbers. Their meaning is no longer confined to the comparison between big and small, but extends to represent any two opposite physical scenarios and make them colorful Rich connotation, but also for the expression of the physical volume provides an important, simple method to make one-dimensional vector arithmetic algebra. In the teaching practice, students find that the positive and negative meaning of the physical quantity and the operation rules are not well controlled. The reason is that the positive and negative values ​​appear in the textbook as a knowledge point