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一、关于对上节课的目标性测试1.提问:什么叫浮力?它的方向如何?学生答:浸没在液体或气体里的物体,都要受到液体或气体向上托起的力,这个力就是浮力。浮力的方向总是竖直向上的。2.提问:浮力产生的原因是什么?学生答:浸没在液体里的物体受到的向上的压力比向下的压?
First, on the objective test of the previous class Question: What is buoyancy? What is its direction? Student A: Objects that are immersed in liquids or gases must be lifted by liquid or gas. This force is buoyancy. The direction of buoyancy is always vertical. 2. Question: What is the reason for buoyancy? Student A: The object immersed in the liquid is subjected to upward pressure rather than downward pressure.