Question

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

• A. A sharp knife is usually made of silver which is a strong metal.
• B. A sharp knife has a larger contact surface area and hence applies more pressure.
• C. A sharp knife has a smaller contact surface area and hence applies more pressure.
• D. A sharp knife has a smaller contact surface area and hence applies less pressure.

Answer 1

The correct option is C A sharp knife has a smaller contact surface area and hence applies more pressure.

A sharp knife has a lesser contact surface area than a blunt one. Lesser the surface area, greater will be the pressure. So, a sharp knife applies a greater pressure when it is used for cutting. This is why a sharp knife cuts better than a blunt one.