用图象描述简谐振动,对于中学生来说,是比较抽象的。我在教学中发现,为数不少的同学不能正确地理解振动即时位置(位移)与图象上的点的对应关系。为此,本文介绍一个程序(见附图)。运行这个程序,既可以从屏幕上看出单摆在振动中位移与描述这个振动的图象的即时关系,还可以随意地将任一时刻的单摆的 The use of images to describe harmonic vibrations is more abstract for middle school students. In my teaching, I found that a large number of classmates could not correctly understand the correspondence between the instantaneous position (displacement) of the vibration and the point on the image. For this reason, this article describes a program (see the attached figure). Running this program, you can see from the screen the instantaneous relationship between the displacement of the pendulum in the vibration and the image that describes the vibration, and you can also arbitrarily place the pendulum at any time.