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中学物理学中,正负号贯穿于整个教材始终。能否正确理解和掌握正负号的含义。直接影响到能否正确理解和掌握物理概念,能否迅速准确地进行计算。因此,引导学生正确运用正负号是物理教学的一个重要部分。所以要求我们在教学中注意总结其特点,指出一些常见错误,相信将有利于学生更好地学习物理知识。一、常见的几种不同意义的正负号1.表示同一直线上的矢量方向的正负号。此类物理量的正负
In middle school physics, the sign runs through the entire textbook. Can correctly understand and grasp the meaning of signs. A direct impact on the ability to correctly understand and grasp the concept of physics, can be calculated quickly and accurately. Therefore, guiding students to correctly use the sign is an important part of physics teaching. Therefore, we are required to pay attention to summarizing its characteristics in teaching, pointing out some common mistakes and believing that it will be beneficial to students to better study the physical knowledge. First, the common sense of several different sign 1. Indicates the sign of the vector direction on the same line. The physical quantity of the positive and negative