Question

why a sharp knife cut better than a blunt knife

Answer 1

A sharp knife has a very thin edge to its blade. A sharp knife cuts objectsbetter 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.

Answer 2

Because if area is smaller than pressure is greater and if area is greater than pressure is smaller so sharp knife has small area and blund knife has greater area so shrp knife has greater pressure and its cut better than blunt knife.