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浸在液体里的物体受到浮力的原因是液体对物体向上的压力大于液体对物体向下的压力。因为以往没有较好的实验来显示浮力产生的原因,所以,许多初中学生对浮力产生的原因往往不易理解,形成了一个教学难点。本文介绍一个简单易行的实验,它能直观明了地显示浮力产生的原因,在教学中能帮助突破这一教学难点。 1 实验器材 (1)大号透明、无色的塑料饮料瓶一个,把瓶的上部截去,使它成为直口瓶。 (2)彩色乒乓球一个,1000毫升的盛水烧杯两个。 (3)小号透明、无色塑料饮料瓶一个,把瓶底和瓶颈的一部分截去,使瓶颈截口处的直径略小于乒乓球
The reason why the object immersed in the liquid is buoyant is that the upward pressure of the liquid on the object is greater than the downward pressure of the liquid on the object. Because in the past there were no good experiments to show the cause of buoyancy. Therefore, many junior high school students often have difficulty understanding the causes of buoyancy and formed a teaching difficulty. This article describes a simple and easy experiment that can intuitively and clearly show the causes of buoyancy, and can help break through this teaching difficulty in teaching. 1 Experimental equipment (1) A large transparent, colorless plastic beverage bottle is cut off from the top of the bottle to make it a straight bottle. (2) One color table tennis ball, two 1000 ml water beakers. (3) A small, transparent, colorless plastic beverage bottle, which cuts off the bottom of the bottle and a part of the bottleneck, so that the diameter of the bottleneck is slightly smaller than that of the table tennis ball.