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《反冲》一课主要是让学生通过实验几个反冲现象,认识什么是反冲,然后在认识的基础上了解反冲的应用。 第一个实验是塑料瓶底钻6个小洞,使小洞的距离相等,然后用线系在铁架台上,再往塑料瓶里倒上水,看到水向某个方向喷去,而瓶子往相反的方向转动,就达到了实验目的。 开始,有很多同学用两根细线系住塑料瓶,然后系在铁架台上,可当一倒上水,瓶子刚转了两圈,就又倒过来
The lesson of “recoil” is mainly to let students know what is recoil by experimenting with several recoil phenomena and then understand the application of recoil on the basis of understanding. The first experiment was to drill 6 small holes in the bottom of the plastic bottle so that the distance between the holes would be the same. Then the lines were tied on the iron stand, and then the water was poured into the plastic bottle to see the water sprayed in a certain direction Bottle to the opposite direction of rotation, to achieve the purpose of the experiment. At first, many students tied the plastic bottle with two thin wires, and then fasten it on the iron stand. When the bottle was poured, the bottle just turned two laps, and then came back