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中学物理教材中涉及正负的物理量很多,它们的正负与数学上的正数、负数不同,物理量的正负具有特定的含义,正确理解它们是学好物理的关键.下面对这个问题做一粗浅的总结,以供大家参考. 一、矢量的正负 中学物理中学过的矢量很多,如:力、位移、速度、加速度、动量、冲量等.这些物理量既有大小又有方向,在描述这些物理量时,既要表达其大小,还要说明它们的方向.为了简单明了,在物理学中用“+”、“-”表示它们的方向.如:物
There are many positive and negative physical quantities involved in middle school physics textbooks. Their positive and negative values are different from the positive and negative numbers in mathematics. The positive and negative values of physical quantities have specific meanings. Correct understanding of them is the key to good physics. Shallow summary, for your reference. First, the vector of positive and negative secondary school physics learned a lot of vector, such as: force, displacement, speed, acceleration, momentum, impulse, etc. These physical quantities have both size and direction, in describing these In physical quantities, they must both express their size and indicate their direction. For the sake of clarity, they use ”+” and “-” to indicate their direction in physics.