等效替代法是把复杂的难以理解的物理问题简单化的一种科学思想方法.对于一些实验,本身不可以或很难直接揭示物理本质而采取与之相似的等效现象来替代.“等效”强调某一方面的效果相同.浮力的教学中引入曹冲称象的故事,聪明的曹冲就是用等效替代法称出了大象的体重.具体做法是这样的,将大象拉到船上,并在船舷上做上记号,记下此时船和象排开水的体 Equivalent substitution is a scientific way of thinking that simplifies complex, difficult-to-understand physical problems, and for some experiments it may not be possible or very difficult to directly reveal the physical nature of the physical equivalent and adopt a similar equivalent instead. Equivalent "emphasizes the same effect in some aspects.Study on buoyancy introduces the story of Cao Chong said, clever Cao Chong is the equivalent replacement method, said the elephant’s weight.To do so, the elephant pull Go to the boat and make a mark on the side of the ship, keeping a note of the boat and the body of water like this