我们在讲授浮力时,为了克服学生对这个抽象概念的不易理解,设计了一个演示浮力原理的装置,称作浮力演示仪。实践证明,用这个装置演示浮力原理,效果是理想的。(一)仪器构造附图是这个装置的简图。该装置由外水槽 A 和内水槽 B 构成,水槽 B 的底面中央有一方孔 C,方孔 C 与A槽连通。另有一边长为 a的立方形木块 d,用以演示液体的浮力。木块 d 的下底面要求边缘光滑,能与方孔C的边缘密切接合。(二)实验步骤与现象分析第一步:把木块 d 移进水槽 B 中,使木块底面边缘与方孔 C 的边缘密切接合。第二步:向水槽 B 中缓慢加入清水(注意加水不能 When we talked about buoyancy, in order to overcome students’ difficult understanding of this abstract concept, we designed a device that demonstrates the principle of buoyancy, called the buoyancy demonstration instrument. Practice has proved that using this device to demonstrate the principle of buoyancy, the effect is ideal. (I) Instrument construction The drawing is a diagram of this device. This device is composed of an outer tank A and an inner tank B. The bottom of the tank B has a hole C in its center, and the square hole C communicates with the A tank. In addition, a cubic block d on one side of a is used to demonstrate the buoyancy of the liquid. The bottom surface of block d requires a smooth edge that can be in close contact with the edge of square hole C. (II) Experimental procedure and analysis of the phenomenon Step 1: Move the block d into the sink B so that the bottom edge of the block is in close contact with the edge of the square hole C. Step 2: Slowly add clear water to sink B (note that adding water cannot