ａ.演示现象。如图1所示,将动能和势能互相转化演示仪,从斜面某一高度上滚下,当它滚到水平面一定位置后,又会往回滚动,直到返回斜面(返回斜面的高度视斜面和水平面光滑程度而定),然后再往复下去。图1　动、势能互相转化演示ｂ.演示仪的原理。当动能和势能互相转化演示仪向下滚 a. Demonstration phenomenon. As shown in Fig. 1, the kinetic energy and potential energy are transformed into the demonstrator and rolled down from a certain height of the inclined plane. When it rolls to a certain position on the horizontal plane, it will roll back until it returns to the inclined plane (the height of the return inclined plane is considered as the inclined plane and The degree of smoothness depends on the level, and then go back and forth. Figure 1 shows the principle of the demonstrator. When the kinetic energy and the potential energy are interconverted, the demonstrator is rolled down