振动和波一般是比较复杂的运动,我们可以运用振动图象和波动图象来形象描述它们的运动规律。在高中物理主要研究简谐振动和简谐波的图象,而运用这些图象去判断某一时刻或某一位置的质点作简谐振动的方向,正是我们要掌握的基本功。下面介绍一种运用对比的判断方法。 Vibration and waves are generally more complex motions. We can use vibration images and wave motion images to visualize their motion laws. In high school physics, we mainly study the images of harmonic vibrations and harmonic waves. Using these images to judge the direction of a simple harmonic vibration at a certain point in time or a certain position is exactly what we must master. The following describes a method of judging using comparison.