所谓控制变量法,就是把多因素(或多变量)的问题转变为多个单因素的问题,分别加以研究,最后再综合解决的方法。控制变量法在物理学中应用较广,在初中物理中,一些物理概念的形成及物理规律的产生经常采用控制变量法。近几年中考物理试题中出现了不少涉及控制变量法的好题目,这类试题以控制变量(varlable)方法研究物理问题为背景,提出相关问题,考查学生理解和掌握控制变量法的程度。 The so-called control variable method is to turn multi-factor (or multi-variable) problems into multiple single-factor problems, study them individually, and then finally comprehensively solve them. The control variable method is widely used in physics. In the junior middle school physics, the formation of some physical concepts and the production of physical laws often use the control variable method. In recent years, there have been many good questions concerning the control variable method in the physics examination papers for middle school entrance examinations. This type of questions is based on the varlable method to study physics problems. Related questions are asked to examine students’ understanding and mastery of the control variable method.