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初中应用物理知识竞赛有关浮力部分的内容非常有趣.这里根据习题特点分五个专题进行讲解.五个专题是:浮力的大小,物体浮沉条件的应用,研究漂浮的物体,浮力变化与液面升降.综合知识应用.一、浮力的大小计算浮力大小的方法有多种.对任何受到浮力的物体都适用的方法是应用阿基米德原理.即浮力的大小等于被物体排开的液体受到的重力,表达式为F_浮=G_(排液)=m_(排液)g=ρ_液gV_排.对于漂浮在液面的物体,浮力的大小等于物重,F_浮=G_物.对于较重的物体,可以用弹簧测力计测出物体的重G及物体浸在液体中时的示数.
The content of the buoyancy part of the junior high school Applied Physics Quiz is very interesting, which is divided into five topics according to the characteristics of the exercises. The five topics are: the size of the buoyancy, the application of the object’s floating conditions, the research on floating objects, the buoyancy change and the liquid surface lift General Knowledge Applications 1. Size of Buoyancy There are several ways of calculating the size of a buoyant.A suitable method for any object subjected to buoyancy is to use the Archimedian principle that buoyancy is equal to the size of the liquid being lifted by the object Gravity, the expression F_ float = G_ (drain) = m_ (drain) g = ρ_ liquid gV_ row. For objects floating in the surface, the size of the buoyant is equal to the weight of the object, F_Floating = G_ For heavier objects, a spring force gauge may be used to measure the weight of the object and the number of objects immersed in the liquid.