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关于杠杆在空气中的平衡问题,同学们可直接利用杠杆平衡原理去分析解决.若将此杠杆两边的重物同时浸没在液体中时,杠杆的平衡将发生怎样的变化呢?因此类问题涉及到杠杆的平衡原理、物体的受力分析、阿基米德原理、液体的密度、固体的密度等好多知识点,问题比较复杂,一时难以判断出来.那么,解决此类问题究竟有没有规律呢?下面就对此类题进行分析和推导,并把解决这类题的规律总结出来,以便帮助同学们提高解题能力.
With regard to the balance of the lever in the air, the students can directly use the principle of lever balance to analyze and solve. If the weights on both sides of this lever are simultaneously immersed in the liquid, how will the balance of the lever change? The balance principle of levers, force analysis of objects, Archimedes’ principle, density of liquids, density of solids, and many other points of knowledge are complex. It is difficult to judge them at one time. Then, is there any law to solve such problems? The following analysis and derivation of such questions, and summarize the laws to solve such problems in order to help students improve their ability to solve problems.