近几年的中考物理试题中,常出现与浮力知识和压强知识联系在一起的综合型题.这类问题一般隐含着一定的几何关系,只有认清了其中的几何关系,才能顺利解决问题.要确定物理问题中的几何关系,首先应作出正确、合理、便于比较的图示,而图示的关键则是确定必要的参照面(或线或点).只有这样,才能弄清物理情境变化过程中呈现出的对应几何关系,从而得出解决问题的有效方法.下面举例谈谈几何关系在求解此类问题中的应用. In recent years, senior high school entrance examination physics questions often appear with buoyancy knowledge and pressure knowledge of the integrated type of problem. Such problems generally implies a certain geometric relationship, only to understand the geometric relationship between them in order to successfully solve the problem To determine the geometry of a physical problem, the first thing to do is to make the right, the reasonable, and the easy-to-compare illustration, and the key to the illustration is to determine the necessary reference planes (or lines or points). Only in this way can we understand the physical situation The process of change shows the corresponding geometric relationship, and thus come to an effective solution to the problem. The following example to talk about geometric relationships in solving such problems in the application.