最近,我听了一位同行执教的物理课。这位物理老师在讲《浮力的大小》时,开头是这样的:老师拿着一只空的可乐瓶,底朝下慢慢按入盛有一半水的水槽中。“请同学们做一下实验,看看有什么感觉?”老师语音刚落,同学们就做起实验来。“受到一个向上的力,而且越往下按,这个力越大。”同学们纷纷发言。 Recently, I listened to a physics class taught by my peers. When the physics teacher was talking about “The size of buoyancy,” the beginning was like this: The teacher took an empty Coca-Cola bottle and slowly pressed it down into a sink with half of the water. “Please ask the students to do some experiments and see what it feels like?” The teacher just started to speak and the students started experimenting. “Acquiring an upward force, and pressing the more down, the greater the force.” The students have spoken.