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Why sharp knife cuts better than …

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Why sharp knife cuts better than blunt knife

Posted by Het Patel 7 years, 11 months ago

CBSE > Class 09 > Science

2 answers

Sushil Kumar 7 years, 11 months ago

pressure and area are inverseley proportional to each other.

so, if we increase area the pressure will be less ( blunt knife has larger area so less pressure on object)

and sharp knife has smaller area so more pressure on objects.

Shraddha J 7 years, 11 months ago

A sharp knife has a very thin edge to its blade. A sharp knife cuts objects better because due to its very thin edge, the force of our hand falls over very small area of the object producing a large pressure. And this large pressure cuts the object easily. On the other hand, a blunt knife has a thicker edge. A blunt knife does not cut an object easily because due to its thicker edge, the force of our hand falls over a larger area of the object and produces lesser pressure. This lesser pressure cuts the object with difficulty.

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