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《小水轮》(鄂教版自然第四册)教完后,我布置了一项课外活动:同学们回家后做个小水轮,并想办法让小水轮带动别的物体转动。第二天,有几个同学真地拿着他们做的小水轮来找我了。有的小水轮是用热水瓶木塞插上塑料片,有的是用易拉罐做的,还有的是用塑料瓶盖胶上塑料片制成的……虽然做得粗糙,但从他们那各不相同的取材,形态各异的造型中,我发现了他们的创造力。特别是,他们在小水轮中轴的另一端,有的安装了一个玩具小齿轮,有的安装了一个用橡皮泥捏成的皮带轮。我问他们,为什么要装上齿轮、皮带轮?他们告诉我说,
After teaching “Little Waterwheel” (Hubei Education Edition, Nature, Volume IV), I arranged for an extracurricular activity: the students returned home to be a small water wheel and tried to get the small water wheel to drive other objects to rotate. The next day, a few students really came to me with the little water wheel they made. Some small waterwheel is plugged with plastic bottle cork thermos, some are made of cans, and some are made of plastic plastic cap on the plastic bottle ... ... Although rough, but from their different materials , Different shapes of the shape, I found their creativity. In particular, they installed a toy pinion at the other end of the central axis of the water wheel, and some installed a pulley molded from plasticine. I asked them why they should be fitted with gears and pulleys. They told me that,