1“不听话”的小圆片(1)用小刀从硬泡沫块上削下一小块薄片,加工成圆形(直径约4 mm)。在一个饮料瓶盖中,先装半盖子水,把泡沫小圆片放入盖中心。这时会看到小圆片先从中间慢慢向盖子边缘移动,快要到达边缘时,小圆片加速运动到边缘,并尽力要往盖壁上爬,最后,小圆片一部分在水里,一部分在水和盖壁的交界处的盖子上(露出液面)。如果用牙签把小圆片“推”到瓶盖中间的水里,它仍然要往盖壁处加速 1 “Disobedient” Wafer (1) Using a knife, cut a small piece of sheet from a rigid foam block and process it into a circle (about 4 mm in diameter). In a beverage bottle cap, first install half a lid of water, the foam into the center of the lid. At this moment, you will see that the small disc moves slowly toward the edge of the lid from the middle. When it is about to reach the edge, the small disc accelerates to the edge and try to climb up to the cover wall. Finally, part of the small disc is in the water, Part of the lid at the junction of water and cover (revealing the liquid level). If you use a toothpick to “push” a small disc into the water in the middle of the cap, it will still have to accelerate toward the lid