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在天体运动规律的教学中,宇宙速度是个非常重要的物理量。在现行的人教社高一物理教材中给出了三个宇宙速度的定义和数值:第一宇宙速度相对简单,且给出了简单的计算,但是对于第二和第三宇宙速度,教材中仅仅给出了其定义和数值。学生常常问:这两个宇宙速度到底是怎么计算出来的呢?能够掌握第二宇宙速度的计算对于学生正确理解宇宙速度的本质有很大的帮助。
In the teaching of the law of celestial movement, cosmic speed is a very important physical quantity. The definition and numerical values of the three universal velocities are given in the current textbook for teaching human highschools and highs: the first cosmic velocity is relatively simple and gives a simple calculation, but for the second and third cosmic velocities, Only its definition and value are given. Students often ask how these two cosmic speeds are actually calculated. Being able to grasp the calculation of the second cosmic speed is of great help to students in correctly understanding the nature of cosmic velocity.