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进入高中阶段学习的许多物理量都带有“+”“-”号.因为很多学生并不真正理解其物理意义,致使在比较物理量的大小,计算物理量的变化及在求功等的过程中常常出错.下面谈谈物理中的“+”“-”号所代表的的物理意义.一、矢量中的“+”“-”规定某一方向为正方向,则与之相反的方向及为负.包括:力、加速度、速度、位移、动量、冲量及电场强度、磁感应
Many of the physical quantities that go to high school come with “+ ” “- ” because many students do not really understand their physical meaning, causing them to compare physical quantities, calculate changes in physical quantities, The process of error often. Now talk about physics in the “+ ” “- ” represents the physical meaning. A vector of “+ ” “- ” provides that a certain direction is positive Direction, and the opposite direction and negative. Including: force, acceleration, velocity, displacement, momentum, impulse and electric field strength, magnetic induction