《义务教育物理课程标准(2011年版)》要求我们在平时的教学过程中要特别重视研究方法的指导.在初中物理中常见的研究方法有:控制变量法、转换法、等效法、类比法、比较法、分类法、模型法、理想实验法和推理归纳法等等,其中转换法在初中物理中应用最为广泛,应当引起我们的高度重 “Compulsory Education Physics Curriculum Standard (2011 Edition)” requires that we pay special attention to the guidance of research methods in the normal teaching process.Common research methods in junior middle school physics are: control variable method, conversion method, equivalent method, analogy method, Comparative method, classification method, model method, ideal experiment method and reasoning induction method, etc. Among them, conversion method is the most widely used in junior middle school physics and should cause our high degree of emphasis