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中学物理中正负号是最为常见的符号。对矢量而言,正负号有着共同的意义,即正号表示对应物理量与规定的正方向相同,负号表示对应物理量与规定的正方向相反。矢量的正负号意义的单一性,让中学生能较快将其记忆理解。对不同的标量而言,它们的意义却存在差异,再者由于教材、资料对其缺乏梳理归纳,让中学生掌握起来存在一定的难度。而正确理解这些正负号,是正确运用对应物理量的基础。
Sign in secondary school physics is the most common symbol. For vectors, the sign has a common meaning, that is, the positive sign indicates that the corresponding physical quantity is the same as the positive direction, and the negative sign indicates that the corresponding physical quantity is opposite to the prescribed positive direction. The unity of sign meaning of vector makes middle school students understand their memory faster. For different scalars, their meaning is different, but also because of the lack of teaching materials and information to sort out, so that students have some difficulty in mastering. Correct understanding of these signs is the basis for the correct use of the corresponding physical quantities.