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Samayak Malhotra from JSS Private School , asked a question
Subject: Science , asked on 29/11/12

Why cutting tools have sharp edges?

EXPERT ANSWER

nitish.gupta ,Meritnation Expert added an answer
Answered on 30/11/12

The pressure exerted due to a small surface area is high compared to pressure due to large surface area. This is derived from the equation,

Pressure = Force/Area

Which implies an equal force can exert higher pressure on a small area. This is why the cutting edges of tools like knives, blades etc are provided with sharp edges. The high pressure at the end of these sharp surfaces can easily pierce through wooden, plastic etc surfaces.

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Arpita Sukhwani , From Kendriya Vidyalaya No 1 , added an answer
Answered on 10/12/11

 cutting tools have sharp edges because on smaller area we have to apply less force.

hope you got it.

T.sai , added an answer
Answered on 29/11/12

cutting tools have sharp edges because on smaller area we have to apply less force.So u apply less force