论文部分内容阅读
根据功的原理可知,使用任何机械都不能省功。因此,省力的杠杆不省距离;省距离的杠杆不省力。既省力又省距离的杠杆是没有的。
According to the principle of work, using any machine can not save power. Therefore, the labor-saving lever does not save the distance; the lever of the provincial distance is not labor-saving. There is no leverage that saves labor and saves distance.