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在机械波一章中,分析介质中质点的运动情况是该章的主要内容之一,而质点的振动方向恰反映了其运动情况,本文在已明确机械波传播方向的基础上对如何判断质点振动方向予以剖析和总结. 一、根据波的形成原理与传播特点而得到的原理型方法1.带动法(根据波的形成原理——前质点带动后质点) 在质点P靠近波源一方附近(不越过波峰或波谷)图线上找另一点P’,若P’在P上方,则P向上运动,若P’在P下方,则P向下运动. 如图1,用带动法找出了靠近波源一方附近的P’点,很容易看到P’点在P点的上方,所以P
In the mechanical wave chapter, analyzing the motion of the mass point in the medium is one of the main contents of this chapter. The vibration direction of the mass point exactly reflects the motion of the particle. This article has determined the vibration direction of the particle on the basis of the direction of propagation of the mechanical wave. To be analyzed and summarized. First, the principle method based on wave formation principles and propagation characteristics 1. Driving method (according to the formation principle of the wave - the former particle driven particle) Near the source point near the particle P (do not cross the crest (or valley) map to find another point P’, if P’ is above P, then P upward movement, if P’ is below P, then P downward movement. As shown in Figure 1, using driving method to find a source close to the source Near the P’ point, it is easy to see that the P’ point is above the P point, so P