力学在高中物理中的位置非常重要,每年的高考中占一定的分值.等效法在教学和学习过程中的运用,不仅可以使我们对物理问题的分析和解答变得简捷,而且对灵活运用知识、促使知识、技能和能力的迁移,都会有很大的帮助.等效方法是通过对问题中的某些因素进行变换或直接利用相似性,移用某一规律进行分析而得到相等效果.利用等效法不仅可以使问题变 The position of mechanics in high school physics is very important, accounting for a certain score each year in college entrance examination.Equivalence method in the teaching and learning process, not only can make our analysis and answers to the physical problems become simple, but also to the flexible use Knowledge, to promote the transfer of knowledge, skills and ability, will be of great help.Equivalent method is through the transformation of some of the factors in the problem or the direct use of similarities, the use of a law of analysis and get the same effect. Equivalence can not only make the problem change