本文对沪科版初中《物理》第一册课本“浮力、阿基米德原理”一节作如下教学讨论．１关于用称重法建立浮力的概念 该实验是在弹簧秤下挂一重物，先在空气中称出物重Ｇ，再将物体浸入水里得到弹簧秤的示数Ｆ′，引导学生通过对Ｆ′和Ｇ的比较分析得出浮力的概念．这种方法对培养 This article discusses the “Buoyancy, Archimedes Principles” section of the first volume of the textbook “Physics” in Shanghai Science and Technology Junior Middle School. 1 About the concept of establishing buoyancy using the weighing method This experiment is to hang a heavy object under the spring scale, first weigh out the weight G in the air, and then immersed the object in water to obtain the number F’ of the spring scale, guiding the student to pass the F′. The comparison of G and G gives the concept of buoyancy. This method is for training