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现有小水轮是教学仪器厂生产的组合式塑料制品材料,这种小水轮材料轻、体积小,对实验“水流有力量”这个知识点效果是好的。但是正因为它体积小,在进行本课难点“水位高、流量大,水轮转动快”的对比实验时,只要有水冲它,它都能快速转动,水流量大小变化带来的小水轮转动快慢对比不明显,观察效果不好,对突破教材难点有困难。
The existing small water wheel is a combination of teaching equipment factory production of plastic materials, this small water wheel material, small size, the experimental “water has the power” of this knowledge point effect is good. However, precisely because of its small size, when it comes to the difficult task of this lesson, the comparative experiment of “high water level, large flow rate and fast waterwheel rotation” can rapidly rotate as long as there is water flushing it. The small water Rotation speed contrast is not obvious, the observation is not good, difficult to break through difficult textbooks.