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升降设备中的流体随升降设备一起在竖直方向上所做的变速运动,是物理学中的典型问题。对于这类问题的分析,有人简单运用阿基米德原理,以致得出错误结论;有些人则直接运用“物体所受浮力等于物体排开液体的视重”这一结论。本文运用牛顿定律,在对液体内部压强进行分析的基础上,得出“物体所受浮力等于物体排开液体的视重”这一普遍适用的结论,既可拓展阿基米德原理的应用范围,又使得流体运动的分析有据可依。一、升降系统中液体内部的压强
The fluid movement in the lifting equipment is a typical problem in physics with variable speed movements of the lifting equipment in the vertical direction. For the analysis of such problems, some people simply use the principle of Archimedes, which led to the wrong conclusion; some people directly use the “object buoyancy equal to the object discharge liquid weight ” this conclusion. Based on the analysis of the internal pressure of liquid, Newton’s law is used to conclude that “the buoyancy of an object is equal to the apparent weight of the liquid discharged by the object”, which can not only expand the principle of Archimedes Applications, but also makes the analysis of fluid movements with evidence. First, the pressure inside the liquid lift system