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《反冲》一课要求学生认识反冲现象及其应用。教材中设计的实验是用一个大塑料瓶,在瓶壁下部用粗锥沿一个方向斜扎6个等距离的洞,用细线悬挂,瓶内注水后,观察瓶子产生的反冲现象。
“Recoil” lesson requires students to recognize the recoil phenomenon and its application. The experiment is designed with a large plastic bottle in the lower part of the bottle wall with a rough cone along a direction oblique 6 straight holes, hanging with a thin line, after filling the bottle to observe the bottle recoil phenomenon.