Question

You know that a sharp knife cuts better than a dull knife. Do you know why this is so? Give the reasons for your answer.

Answer 1

Reason for sharp knife cuts better than a dull knife:

1. A sharp knife has a smaller area of cross-section or thin edge than a dull knife.
2. When we apply force to cut an object using a knife then that force will act over a smaller area in case of a sharp knife in comparison to a dull knife.
3. Pressure is the force applied per unit area. So, pressure will be more in the case of a sharp knife.

Hence, a sharp knife cuts better than a dull knife.