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本文对常见物理量正负符号的物理意义进行了分类,说明了要想用好物理量的正负符号,我们需要明确各量的物理意义,量性,使用时需要注意的问题,物理量在参与运算时,是否带符号运算一直是个难点,也是学生容易混乱不清的地方。不同的物理量的正负符号表示的物理意义差别较大,当代入公式时有物理量需要带正负运算,但有的却不需要,所以避免出现错误理解物理运算中的问题。
This paper classifies the physical meaning of the sign of the common physical quantity, which shows that in order to make good use of the positive and negative sign of the physical quantity, we need to clarify the physical meaning and the quantitativeness of each quantity, the problems that need attention when using the physical quantity. It’s always been a dilemma whether or not signed arithmetic is a place where students can easily confuse. Different physical quantities of positive and negative symbols that the physical meaning of the difference is large, when the contemporary formula into a physical quantity requires positive and negative operations, but some do not need, so to avoid mistakes in understanding the problems of physical computing.