Why does a knife become blunt with use?

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This is due to property of abrasion which is a process of wearing away a surface by friction.
As we know, The force of friction acts between all moving bodies, which are in contact with one another.So here Knife is in contact with another bodies such as vegetables.So when we cut vegetables with knife then the surface of knife and Surface of vegetables wear off on each other.So after long use surface of knife become blunt due to wearing off of the surface of knife due to friction.

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