初中物理上册第六章《浮力》是一个重点单元,根据经验,这一章也是初二学生能否学好物理的一个重要的转折点。现行课本,主要采用演示实验进行教学,教学难度大,学生“感受”不深。我们把演示实验变为探索性实验,启发学生正确理解浮力这一章的基本概念和规律。我们的做法是,让学生在教师的指导下,亲自动手做五个实验。从物体在空气中的秤重与液体中的秤重不一样,让学生从感性上得知浮力的存在;再把物体放在水、盐水、酒精中秤重,与在空气中的秤重相比较,让学生感受到浮力与液体的性质(密度)有关;把物体逐渐浸入水中看到浮力逐渐增大,使学生感知浮力与排开水的体积有关;把物体全部浸没在水中,再逐渐增大深度发现浮力不 The junior middle school physics volume sixth chapter “buoyancy” is a key unit, according to experience, this chapter is also a sophomore student can learn physics an important turning point. The current textbook, mainly used for demonstration teaching experiment, teaching difficult, students “feel” is not deep. We turn demonstration experiments into exploratory experiments to inspire students to correctly understand the basic concepts and laws of buoyancy. Our approach is to allow students to do five experiments under the guidance of the teacher. From the object in the air and the liquid in the weighing of the weighing is not the same, so that students from the perceptual buoyancy that exists; then the object on water, salt water, alcohol, weighing, and weighing in the air phase Compare to let students feel the buoyancy and the nature of the liquid (density); the object gradually immersed in water gradually increased buoyancy, so that students perceived buoyancy and the volume of water drainage; the object immersed in water, and then gradually increased Deep buoyancy is not found