机械波是中学力学知识中比较抽象、综合性较强的内容之一 ,学生在解决有关机械波的问题时往往感到很棘手 .现就中学阶段出现的机械波问题进行归类例析 ,以期达到抛砖引玉的功效 .一、已知介质质点的振动方向 ,求波的传播方向例 1　一列简谐横波沿 x轴方向传播 ,如图 1所示的是 Mechanical wave is one of the more abstract and comprehensive contents in middle school mechanics knowledge. Students often find it very difficult to solve problems related to mechanical waves. Now we classify mechanical wave problems that appear in middle school in order to achieve the effect of attracting attention. 1. The direction of the vibration of the known medium particle and the direction of the propagation of the wave. Example 1 A simple harmonic wave propagates along the x-axis, as shown in Figure 1.