在初中物理《浮力》一章的复习教学中,怎样分析冰融化后水面的变化情况,是许多学生都很难理解的一个难点。特别是还要进一步分析“冰中包含着一个小木块”“冰中包含着一个小石块”等更加复杂的问题时,学生往往顾此失彼、片面作结,从而大面积得出错误结论!很显然,这里需要教师用巧妙的思维方法作引导,帮助学生理清分析思路,这样才能使学生走出茫然,抓住问题的关键笔者在多年的实际教学中,多次尝试用自创的“分力法”引导学生分析“冰 How to analyze the change of water surface after ice melting is a difficult point that many students find difficult to understand in the reviewing teaching of physics ”buoyancy“ in junior middle school. In particular, further analysis of the more complex issues such as ”a small piece of wood in the ice,“ ”a small piece of stone in the ice,“ and so on, students tend to ignore one another and make a one-sided result, resulting in a large area of ​​error Obviously, teachers are required to use clever ways of thinking as a guide to help students sort out the analysis of ideas, so that students can get out of the dazed, the key to grasp the problem in many years of practical teaching, many attempts to use their own ”Score method “ to guide students to analyze ”ice