Question

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

• A. True
• B. False
• C. A sharp knife has a smaller contact surface area and hence applies more pressure.
• D. A sharp knife has larger contact surface area and hence applies more pressure.

Answer 1

The correct option is C

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

We know that pressure is inversely proportional to the area of the surface in contact.

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