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1引言单摆是中学生接触到的第一个周期性运动,在中学物理的教学中是一个难点,因为学生对振动的位移-时间关系以及速度-时间关系缺乏感性认识.为解决这个问题,传统的方法是利用沙摆留迹的方法演示单摆的位移-时间关系.这种方法存在三个明显的缺陷:(1)随着沙的流出,沙漏的重心下
1 Introduction Pendulum is the first cyclical movement exposed by high school students and is a difficult point in the teaching of physics in middle school because of the lack of perceptual knowledge of the displacement-time relationship and the speed-time relationship of vibration. To solve this problem, Is to demonstrate the displacement-time relationship of the pendulum by using the method of sediment trace. There are three obvious defects in this method: (1) With the outflow of sand, the center of gravity of the hourglass