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对初中生来说《浮力》这一章是很难理解的,概念多,物理量多,前后联系密切,往往有很多学生掌握不好,在考试中一看到浮力题就害怕。这就要求教师在教这章时必须认真研究好教材,掌握学生的实际情况,找出学生出错的根源,将难点及时在课堂上解决,让学生顺利地轻松地学好这章。一、讲明浮力产生的原因如果我们在课堂上问:一个浮在水中的物体共受几个力的作用? 会有很多学生回答:浮力、重力和压力。其错误的原因就是没搞清浮力产生的原因。
For junior high school students, the chapter “buoyancy” is very difficult to understand. There are many concepts, many physical quantities, and close connections. There are often many students who do not master well, and they are afraid to see buoyancy questions in the examination. This requires teachers to carefully study the textbooks when they teach this chapter, master the students’ actual situation, find out the source of the students’ mistakes, and solve the difficulties in class in time, so that the students can learn this chapter smoothly and easily. First, to explain the reasons for buoyancy If we ask in the classroom: a floating object in a total of several forces? There will be a lot of students to answer: buoyancy, gravity and pressure. The reason for the error is that we have not found out the reasons for buoyancy.