两个同样的瓶子一个装沙一个装水,在同一个倾斜度哪个先滚下去,为什么?
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两个同样的瓶子一个装沙一个装水,在同一个倾斜度哪个先滚下去,为什么?
两个同样的瓶子一个装沙一个装水,在同一个倾斜度哪个先滚下去,为什么?
两个同样的瓶子一个装沙一个装水,在同一个倾斜度哪个先滚下去,为什么?
装沙子的先滚下去
这个主要跟物体的惯性有关
沙子是固体,当装沙子的瓶子朝斜面往下滚的时候,沙子随着瓶子一起滚动
而水是液体,当装水的瓶子沿斜面下滚的时候,由于水具有惯性,它并不会随着瓶子滚动(这种例子非常多,比如杯子总装水后,转动杯子,会发现其中的水刚开始并不会随着杯子一起转动),因此水的作用实际上是阻碍了瓶子的转动,因此,装水的杯子应该后滚下去
不对 应该是水的先滚!因为用沙子的话沙子因为是固体所以他的滚动也消耗能量,而水瓶的话想滚动不需要水也滚,所以需求能量少!当然就先滚啦
基本同时,滚动摩擦力很小,可以忽略不计
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