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初二物理讲授了杠杆后,紧接着就是讲授轮轴,虽然轮轴实质上是可以连续旋转的杠杆,但是从学习杠杆过渡到轮轴时,有些学生—下理解不了。他们认为杠杆是直的,而轮轴是圆的,直的怎么又代替圆的呢?根据这个实际问题,笔者制作了一个杠杆形状的轮轴。讲授轮轴的第一节课时,用这个杠杆形状的轮轴模型做实验,学生看了这个实验以后可以说都理解了轮轴是可以连
After the second day of physics lectured on the lever, it was followed by the teaching of the axle. Although the axle was essentially a lever that could be continuously rotated, some students couldn’t understand the transition from the learning lever to the axle. They believe that the lever is straight, and the axle is round. How does the straight one replace the round? According to this practical problem, the author made a lever-shaped axle. When teaching the first class of the axle, this lever-shaped axle model was used as an experiment. After the students saw this experiment, they could understand that the axles could be connected.