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空气阻力的详尽理沦涉及雷诺数(Reynold’s Numbers),远非中学物理所能细述的。但是,可在中学物理实验室做一简单的实验,使学生定量地了解落体所受空气阻力的效应。 实验所观测的,是空气阻力对落体的速度的影响。从理论上来说,一个大而轻的物体,从某一高度从静止下落后,第一阶段是加速度逐渐变小的变加速度运动,它的即时速度逐渐变大,第二阶段则是加速度为零的
The detailed explanation of air resistance involves Reynold’s Numbers, which is far beyond the details of secondary school physics. However, a simple experiment can be conducted in the middle school physics laboratory to enable students to quantitatively understand the effect of air resistance on falling bodies. What the experiment observed was the effect of air resistance on the speed of the falling body. In theory, a large, light object that has fallen from a certain height from a standstill, the first stage is a variable-acceleration motion where the acceleration is gradually reduced, and its instantaneous speed gradually increases, and in the second stage, the acceleration is zero. of