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在力学部分我们给学生补充了制作比重计的实验。学生通过自己搞一些简单制作,可以加深对物理知识的理解,进一步提高他们的动手能力,另一方面可以得到一点启发,那就是利用很普通的材料也可制作出有实用价值的简单仪器。下面就是我们发给学生的实验讲义: [实验目的] 1.学会用阿基米德定律解决实际问题。2.掌握比重计的原理、构造和使用方法。 [实验原理] 比重计是一种测量液体比重的仪器。工厂里制造的比重计是一根密封的细长玻璃管,管的下部装有小铅丸,使它能竖直地浮在液面。每支比重计的重量是一定的,它浮在液面时受到的浮力和重量相等,因此不管它浮在
In the mechanics section we have supplemented students with the experiment of making hydrometers. Students can develop their understanding of physics knowledge by making some simple productions on their own and further improve their hands-on ability. On the other hand, they can get a little inspiration, that is, using simple materials can also produce simple instruments with practical value. Here are the experimental lectures we sent to students: [Experimental purpose] 1. Learn to use Archimede’s Law to solve practical problems. 2. Grasp the principle, structure and use of hydrometer. [Experimental principle] A hydrometer is an instrument for measuring the specific gravity of a liquid. The pycnometer manufactured in the factory is a sealed slender glass tube. The lower part of the tube is filled with small lead pellets so that it can float vertically on the liquid surface. The weight of each pycnometer is constant, it floats on the liquid surface and it is equal to the buoyancy and weight, so no matter if it floats