测重力加速度g的方法很多,然而要算落球法的物理意义最为直观,但是它的误差也最大。这种误差主要来源于落球时间的测量。如果用手直接控制跑表或毫秒计的手动开关测时间,可能会引起5%到10%的误差。本实验利用电磁铁传动装置,控制毫秒计的手动开关,克服了计时的困难。从而准确度可有较大的提高,并且装置也很简单。实验装置 There are many ways to measure the gravitational acceleration g, but to calculate the physical meaning of the falling ball method is the most intuitive, but it also has the largest error. This error mainly comes from the measurement of the falling ball time. If you manually control the stopwatch or the manual switch of the millisecond meter to measure time, it can cause 5% to 10% error. This experiment uses an electromagnet actuator to control the millisecond manual switch, which overcomes the difficulty of timing. Therefore, the accuracy can be greatly improved, and the device is also very simple. experimental device