浮力知识不仅与实际生活密切联系,而且在工农业生产和军事上也有着广泛的应用,是中考必考的内容之一。同时,它又与体积、质量、密度、重力、力的合成、二力平衡及压强知识紧密相关,使其又成为初中物理的难点。因此,正确分析并选用合适的方法是顺利解答浮力计算的关键。下面,笔者进行分类例析。一、压差法在解答浮力计算题时,我们不能盲目地套用公式,而是应首先考虑是否产生了浮力。浮力的实质是液体对浸在其中的物体向上和向下的压力差,即 Buoyancy knowledge is not only closely related to real life, but also has wide application in industrial and agricultural production and military affairs. At the same time, it is closely related to the synthesis of volume, mass, density, gravity, force, balance of two forces, and knowledge of pressure, making it a difficult point for junior high school physics. Therefore, the correct analysis and selection of the appropriate method is the key to successfully solve the buoyancy calculation. Below, the author analyzes the classification. First, the differential pressure method In answering the buoyancy calculation problem, we can not blindly apply the formula, but should first consider whether there is buoyancy. The essence of buoyancy is the pressure difference between the upward and downward pressure of an object immersed in a liquid.