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车轮为什么是圆的车轴应装在哪里
更新时间: 2020-10-03 00:00:00  

车轮是圆的原因:是根据圆的几何性质,同圆的半径相等,当车轮在平地上滚动时,轮轴始终处于同一高度的平面上,乘坐的人就不会有上下颠簸的感觉,同时因为滚动摩擦比滑动摩擦更省力;

车轴装在圆心是一个费力杠杆,费力但省距离,装在中心可行最远距离。

关键词: 车轮 为什么 车轴 哪里

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