给我一个支点, 我可以翘起地球

in cn •  last month 

image.png

给我一个支点, 我可以翘起地球

假如某个人可以抬起50公斤的重物,
那么我给他一根扁担,
试问他可以抬起多少公斤的重物?

这是一个很有趣的数学问题,
就只是多了一根扁担,
难道人的力气就会变得不一样了吗?

这就是杠杆原理...

如图所示
假设重物为 甲
假设施力点为 乙
两者距离支点的距离为 a 和 b

那么
两者间的关系为 甲 X a = 乙 X b

比如
a = 2 公尺
b = 5 公尺
甲物重 50公斤
那么
所需施力乙为 20公斤
50 X 2 = 乙 X 5

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