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在初二物理“液体压强的公式”这节的教学中,液柱的压力是个关卡。对初二学生来说,立体想象力差,“无形”的液柱不直观,影响着对这一部分知识的掌握。我采用以下两则演示,收效较好,现介绍如下。一、液柱的演示: 装置(如图1所示): A为大玻璃管(一头要平滑,可用坏大试管改制)。B为白纸片(比试管截面稍大)。C为水槽或烧杯(装
In the second physics “liquid pressure formula ” this section of the teaching, the liquid column pressure is a checkpoint. For the second grade students, the three-dimensional imagination is poor, and the “invisible” liquid column is not intuitive, affecting the mastery of this part of the knowledge. I have adopted the following two demonstrations. The results are good and are presented below. First, the liquid column demonstration: Device (as shown in Figure 1): A is a large glass tube (a head to be smooth, can be used to change the test tube). B is a white paper (slightly larger than the test tube section). C is a sink or beaker (installed