等效思维的实质是在效果相同的情况下,将较为复杂的实际问题变换为熟悉简单的问题,以便突出主要因素,抓住它的本质,找出其中规律.因此应用等效法时往往是用较简单的因素代替较复杂的因素,以使问题得到简化而便于求解.等效法在物理解题中也有广泛的应用,主要有:物理模型的等效替代;物理过程的等效替代;作用效果的等效替代.下面通过例题来说明. The essence of equivalent thinking is to convert more complex practical problems into familiar and simple ones under the same effect, in order to highlight the main factors, grasp its essence, and find out the laws. Therefore, it is often used when applying the equivalent method. Simpler factors replace more complex factors to simplify the problem and make it easier to solve. Equivalent methods are also widely used in physical understanding problems. They include: equivalent substitution of physical models; equivalent substitution of physical processes; effects Equivalent substitutions. The following examples illustrate.