Question

why it is easy to cut an object with sharp knife rather than blunt knife?

Answer 1

As the surface area is less so it is easy to cut in a sharp knife.

Answer 2

$\huge\texttt{Answer;}$

Pressure is inversely proportional to area. Sharp knife has a small area of contact than the blunt knife. Thus, a force will exert more pressure while using a sharp knife than while using a blunt knife.