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初二物理教材中,在讲液体压强的应用时,都是从如何防止液压对人类生产实践造成危害方面讲解。我在教学中补充了利用液体压强来打捞沉船的实验,从积极方面引导学生应用物理知识,激发了学生学习物理的兴趣。从液体压强公式p=pgh可知,液体的压强跟液体的深度和液体的密度有关。在水中,当深度足够深时,液体产生的压强是很大的。如果将这个压强作用于某一面积上时,它将产生一个很大的压力:F=pS。根据这个道理,可以利用液体的压强来提升重物,例如用来打捞沉船。
In the second-second physics textbooks, when it comes to the application of liquid pressure, it is explained from the aspects of how to prevent hydraulic pressure from harming human production practices. In my teaching, I supplemented the experiment of using liquid pressure to salvage shipwrecks, guiding students to apply physics knowledge from positive aspects and inspiring students’ interest in learning physics. From the liquid pressure formula p=pgh, the pressure of the liquid is related to the depth of the liquid and the density of the liquid. In water, when the depth is deep enough, the pressure generated by the liquid is great. If this pressure is applied to a certain area, it will produce a great pressure: F=pS. According to this principle, the pressure of liquid can be used to lift heavy objects, such as for salvaging shipwrecks.