浮力是初中物理力学中较难的一个概念,它融合了质量、体积、密度、重力、二力平衡、压力和压强等有关知识,综合性较强.浮力的计算方法也有多种,为使同学们能把握规律,顺利解决浮力问题,现将常见的浮力计算方法归纳如下.一、上、下表面压力差法物体浸没于液体中时,它的前后、左右表面受到的液体压力可以相互抵消,而下表面受到的液体向上的压力F_(向上)大于上表面受到的液体向下的压力F_(向下),物体总体受到一个竖直向上的力,就是浮力.所以可以根据物体上、下表面受到的液体的压力差来求浮力,即F_浮=F_(向上)-F_(向下).这里需要注意的是,当柱体(长方体、 Buoyancy is a difficult concept in physics of junior high school, which integrates knowledge of mass, volume, density, gravity, balance of the two forces, pressure and pressure, etc. It has many comprehensive methods to calculate buoyancy. In order to make students We can grasp the law and successfully solve the problem of buoyancy, the common buoyancy calculation method is summarized as follows: First, the pressure difference on the upper and lower surface When the object is immersed in the liquid, its liquid pressure on the front and rear, left and right surfaces can offset each other, The upward pressure F_ (upward) of the liquid on the lower surface is greater than the downward pressure F_ (downward) of the liquid on the upper surface, and the object as a whole is subjected to a vertical upward force, ie buoyancy force, so that the upper and lower surfaces The pressure difference of the fluid to be received by the buoyancy, that is, F_Floating = F_ (upward) -F_ (downward) .It should be noted here that when the cylinder (rectangular,