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多杠杆组合的实际应用一例——台秤的工作原理在“有固定转动轴的物体平衡”一节的教学中,有些同学由杆秤的工作原理联想到台秤的工作原理,询问台秤是否也是根据杠杆原理制成的。他们之所以这样想,是因为平时对台秤上的标尺观察的机会较多,很容易识别出这只刻有标尺的金属杆是一支典型的杠杆。然而使他们不解的是:这支普通的杠杆,其支点两侧的力臂长度相差的并不十分悬殊,长、短力臂之比约为5:1,有的
An example of practical application of multi-lever combination - the working principle of the platform scale In the teaching of “object balancing with a fixed rotating axis”, some students think of the working principle of the scale to the scale’s working principle, and ask if the scale is also based on Leverage principle. The reason why they think so is because there are many opportunities for observing the scales on the scales at ordinary times, and it is easy to identify that the metal rod engraved with a ruler is a typical lever. However, what puzzles them is that with this common lever, the length of the arms on both sides of the fulcrum is not very different. The ratio of long and short arm is about 5:1.