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 more surface area and hence applies more pressure.
• B. Blunt knife has a greater surface area in comparison to the sharp knife.
• C. Sharp knives are usually made of silver which has more strength.
• D. A sharp knife applies more pressure by virtue of its smaller contact surface.

Answer 1

Answer: (B), (D)

A sharp knife applies more pressure by virtue of its smaller contact surface.

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.