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问题 已知某物体的密度小于液体的密度,若把该物体放入液体中且受到了浮力的作用,请同学们想一想该物体在液体中是怎样一种状态?也许同学们会不加思索地说,这物体在液体中一定是漂浮状态.如果真是这样的回答,那就错了.下面请看两例:例1 把一边长为10厘米的正方体铁块,投放到5厘米高的盛满水银的容器中,求铁块所受水银的浮力.(g=9.8牛/千克)
The problem is that the density of an object is less than the density of the liquid. If the object is placed in a liquid and subjected to buoyancy, ask the students to think about how the object is in liquid state. Perhaps the students will not add it. Thinking about it, this object must be floating in the liquid. If this is the answer, then it is wrong. Let’s look at two examples: Example 1 Put a square block of iron with a length of 10 cm on one side and place it at a height of 5 cm. In a container full of mercury, ask for the buoyancy of the mercury that the iron block receives. (g=9.8 N/kg)