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What’s So Special About A Sharp Knife?
鋒利的刀刃有什么特別之處?
Everyone knows that a sharp knife cuts better than a dull one, but do you know why, exactly?
眾所周知，鋒利的刀刃比鈍刀更加鋒利，但你知道原理嗎?
The purpose of the cutting edge of a knife is to concentrate the force that’s being applied at the handle.
刀刃的作用其實是將刀柄上的力集中起來。
When you push down on the handle of a knife you exert a force. The force on the handle and the edge are the same, but the areas in which the force is concentrated are quite different.
當你按下刀柄時，實際上你已經(jīng)施加了一種力。刀把和刀刃上的力度其實都是等量的，但力的聚集區(qū)域不同，產(chǎn)生的效果也出現(xiàn)天壤之別。
At the handle your hand’s force is spread over a wide area, but on the cutting edge it is concentrated in a very small area, so therefore the pressure on the edge is much greater.
在刀柄處，力會分散在一個較廣闊的區(qū)域，而在刀刃上，力會聚集在一個非常小的區(qū)域，因此刀刃上的壓力會劇增。
You can easily see how this works with a piece of modeling clay, a nail with a wide head, and a nail with a small head.
只要借助一塊橡皮泥、一枚寬頭釘和一枚窄頭釘，你很容易就能看到這一原理。
譯文為可可英語翻譯，未經(jīng)授權(quán)請勿轉(zhuǎn)載!
