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 do tools meant for cutting always sharp edges?

This is because force acts perpendicularly per unit area. When the tool will be sharp it means that the surface area reduces thus, in this way more force can be applied on an object and it can be cut easily and quickly. So cutting tools always have sharp edges, not blunt edges.

Why do cutting tools have sharp edges Class 8?

question_answer Answers(1)

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.