物理学是一门以观察和实验为基础的科学。物理知识来源于生产、生活中的总结,又运用于人们的生活、生产实际中。在我们平时生活、生产活动中,随时随地都有物理学知识的影子,又随时随地无不在运用物理学中的有关知识。一、力学曾经有一学生问我:老师,为什么我们平时用的塑料桶总是顶部大而底部小,为什么不制成一个圆柱体,这样就可以装更多的水,这是为什么呢?我问学生:你学习过液体的压强公式,液体内部的压强大小与液体的密度和深度成正比,同一液体内部压强只与深度有 Physics is an observation and experiment based science. Physical knowledge comes from the production, the summary of life, but also applied to people’s lives, the actual production. In our daily life, production activities, anytime, anywhere have the shadow of physics knowledge, but also anytime, anywhere use of physics in the relevant knowledge. First, mechanics Once a student asked me: teacher, why we usually use the plastic bucket is always large at the top and small at the bottom, why not make a cylinder, so you can install more water, which is why? Student: You learned the formula of the pressure of a liquid. The pressure inside the liquid is proportional to the density and depth of the liquid. The pressure inside the same liquid is only related to the depth