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有一类习题,用常规方法求解往往繁难,而用复原法求解则较简易。这类习题表象可能相距甚远,但却具有下述相同的本质特征。①每道习题至少介绍两个状态(或过程),初状态(或过程)提供已知条件,末状态(或过程)对待求物理量给出某种限定。②初、末两状态(或过程)有较密切的联系,两状态(或过程)都较复杂,或含有一个、多个不需要求解的未知量。 所谓复原法是指通过复原初状态或复原初过程而使解题过程简化的方法。具体作法是,通过等效处理或
There is a class of exercises that are often difficult to solve with conventional methods, and solving with the recovery method is easier. The appearance of such exercises may be far apart, but they have the same essential characteristics as the following. 1 Each exercise introduces at least two states (or processes). The initial state (or process) provides known conditions, and the final state (or process) gives some limitation to the physical quantity to be treated. 2 The initial and final states (or processes) are more closely related, and the two states (or processes) are more complex or contain one or more unknowns that do not require solving. The so-called recovery method is a method that simplifies the problem solving process by restoring the initial state or restoring the initial process. The specific approach is through equivalent treatment or