单摆演示的改进段惠，殷秀芝，李步高定性研究单摆的周期．课本上的例示是：用秒表测定３０～５０次全振动的时间，通过分析单摆振动的情况城计算出单摆的周期，然后得出结论。多次重复计数，单调而耗时，不利于调动学生的兴趣和求知欲。为此，我们对上述实验作了如下改进... The improvement of the pendulum demonstration Duan Hui, Yin Xiuzhi, and Li Bugao studied the period of the pendulum. The textbook example is: using a stopwatch to determine the time of 30 to 50 full vibrations, by analyzing the situation of the single pendulum vibration city calculates the period of the pendulum, and then come to a conclusion. Counting repeatedly, monotonous and time-consuming, is not conducive to mobilizing students’ interest and curiosity. To this end, we have made the following improvements to the above experiment...