一、实验原理。让若干个相同的小球,从同一位置,每隔一个相等的时间,依次地自由下落。在它们下落的过程中,使之同时停止运动,静止在各自的位置上。测量出相邻的两个小球的相对位移S_1、S_2、S_3、S_4…,这些数值组成等差数列,即可证明自由落体运动为匀变速运动。测量每两个相邻小球下落的时间差ΔT,就能进一步求得重力加速度的值。 First, the experimental principle. Let several identical balls fall freely from the same position and every other equal time. In the process of their falling, make them stop moving at the same time and stay in their respective positions. The relative displacements S_1, S_2, S_3, S_4... of the two adjacent balls are measured. These values ​​constitute the arithmetic progression, and the free-fall motion can be proved as a uniform variable speed motion. Measure the time difference ΔT between each two adjacent balls to determine the value of the gravitational acceleration.