一、问题的提出机械波的形成过程是中学物理教学的一个重点，也是一个难点，学生对机械波中质点只在各自的平衡位置振动，并不随波迁移，它只是以波的形式把振动传播出去难以理解．进而，易将波的图象与振动图象混淆，错误地判断各质点的振动方向．教材用六幅图分解了绳波的形 First, the issue of the formation of the process of mechanical wave is a focal point in middle school physics teaching, but also a difficult point, the students on the mechanical wave of the particles only in their own equilibrium position vibration, does not follow the wave migration, it is only in the form of waves to spread out the vibration is difficult understanding. In addition, it is easy to confuse the wave image with the vibration image and misjudge the vibration direction of each particle. The textbook uses six figures to decompose the shape of the rope wave