波的图象是机械振动和机械波一章的重点内容,也是这一章的难点。在教学过程中,我发现很多学生,虽然对波的图象和振动图象的物理意义已经弄清楚了,但是在遇到质点的振动方向和波的传播方向的问题,总是觉得无从下手,往往出现错误。纠其原因主要是对质点的振动方向和波的传播方向的关系和特点没有掌握,下面我们来分析这个问题。 The image of the wave is the focus of the chapter on mechanical vibration and mechanical wave, and it is also a difficult point in this chapter. During the teaching process, I discovered that many students, although they have made clear the physical meaning of the wave image and the vibration image, they always feel that they cannot start with the problem of the vibration direction and the wave propagation direction of the particle. There are often mistakes. The main reason for correcting is that there is no control over the relationship between the vibration direction of the particle and the propagation direction of the wave. Here we analyze the problem.