Question

A sharp knife cuts better than a blunt knife. Which of the following options gives the correct reason for this?

• A. A sharp knife has smaller contact surface and hence applies more pressure
• B. A sharp knife is costlier than a blunt knife
• C. A sharp knife has more surface area and hence applies more pressure
• D. Sharp knives are usually made of silver which has more strength

Answer 1

The correct option is A

A sharp knife has smaller contact surface and hence applies more pressure

Pressure means how much something is pushing on something else. It is expressed as force per unit area. A sharp knife has lesser surface area than a blunt one, so, a sharp knife applies a greater pressure when used for cutting. This is why it cuts better.