一、教材分析浮力是初中物理教学中的重要内容,具有很强的规律性,综合性强、难度大、课标要求高。本章是对前三章的延伸,包括浮力的概念,通过二力平衡条件及力与运动的关系判断物体的浮沉,通过压强的知识理论分析浮力产生的原因。作为复习课,重点是要抓住浮力的实质,突破两个方法,即实验中利用控制变量法和利用作图对物体进行受力分析法。计划分三个课时进行:1.通过理论再认识浮力,推导出阿基米德原理;2.突破在探究实验中利 First, the textbook analysis Buoyancy is an important part of junior high school physics teaching, has a strong regularity, comprehensive, difficult, demanding high standard. This chapter is the extension of the first three chapters, including the concept of buoyancy, through the balance of force between two conditions and the relationship between force and movement to determine the object’s ups and downs, the pressure of knowledge through theoretical analysis of buoyancy causes. As a review class, the key point is to grasp the essence of buoyancy and to break through two methods, namely experimentally using the control variable method and the use of mapping to carry out stress analysis of objects. The plan is divided into three class hours: 1. By understanding the buoyancy theory, deriving the Archimedes’ principle; 2. Breakthrough in exploratory experiments