Answer: The cutting edges of tools like blades, knives etc., are provided with sharp edges to cut the things easily as the sharp edges has small area on which the force is applied, hence more pressure is applied.

Why should cutting tools be sharp?

So, knives blades and other cutting appliances are designed with a sharper edge which provides for a smaller surface area and thus provides more pressure on the substance or material that is to be cut. ... Thus, knives and blades have sharp edges because they provide less surface area relating to more Pressure.

Why is it easy to cut vegetables with a sharp knife?

And Pressure is inversely proportional to Area, the more the area, the less the pressure and the less the area, the more the pressure. A sharp knife has less area, thus pressure applied will be more , and that's why it's easier to cut Vegetables with a sharp knife than a blunt knife , even if we apply same force.