今天物理课上,老师让我们做了一个有趣的实验:她拿来了一个方向盘(如图1),然后找了班里两个力量悬殊的同学,力量小的同学手握方向盘不动,力量大的同学用力拧轴。奇迹出现了,方向盘居然纹丝不动!力量小的同学自己也很诧异,这是为什么呢?看着疑惑的我们,老师微笑着说:“像方向盘这样,轮和轴固定在一起可以转动的机械叫做轮轴。轮轴也是一种简单机械,在生活中应用非常广 Today’s physics class, the teacher let us do a funny experiment: she brought a steering wheel (Figure 1), and then find two classmates of great power in the class, a small class of students holding a steering wheel power, power Big classmates forced to twist the shaft. Miracles appeared, the steering wheel actually motionless! Strength of the small classmates themselves are very surprised, this is why? Looked puzzled us, the teacher smiled and said: ”Like the steering wheel, the wheel and the shaft can be fixed together with a rotating machine called Axle. Axle is also a simple machine, is widely used in life