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自然教材第九册《反冲》一课的实验目的是使学生初步认识反冲现象,建立初步的“反冲”概念,了解反冲的应用。如何增强实验,使现象更加明显是本课教学的关键。教材中所列的水和气体的两个实验都有待进一步改进。教材中的实验1要求在一个高塑料瓶下部用粗锥子沿着一个方向,斜着钻
The purpose of the experiment of “Backflushing” in the ninth volume of natural textbooks is to enable students to understand the phenomenon of recoil initially, establish the initial concept of “recoil” and understand the application of recoil. How to enhance the experiment, the phenomenon is more obvious is the key to teaching in this lesson. Both the water and gas experiments listed in the textbook are yet to be further improved. Experiment 1 in the textbook requires that the lower part of a tall plastic bottle be traversed in one direction with a rough awl