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斜面为什么能省力
更新时间: 2020-09-22 00:00:00  

因为在受力分析图中,物体在平面上受重力,所以要将物体提到一定高度最少要克服重力;而在斜面上,物体受沿斜面的拉力,反方向的摩擦力,还有重力,还有垂直于斜面的支持力,由正交分解得,拉力小于重力,省力物体沿斜面上升比物体垂直上升所需要的驱动力更小,所以斜面省力。

关键词: 斜面 为什么 省力

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