Question

it is easy to cut vegetables , fruits with sharp knife . a blunt knife does not work here . why does this happen ?

Answer 1

because the surface area of blunt knife is more compared to the sharp knife and hence the pressure will be the different as according to the formula
p=force / area
so if area is more the pressure is less

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.