Question

Why are the edges of the knife and axe kept sharp?

• A. For beautification
  
• B. Easy to carry
• C. Easy to design by a blacksmith
• D. Provide more pressure to cut

Answer 1

The correct option is D Provide more pressure to cut

$Force=\frac{Pressure}{Area}$
The pressure is inversely proportional to the area. Hence the pressure acting on a small surface is large compared to pressure acting on a large surface area. Therefore the edges of the knife and axe are kept sharp so that it will be easy to cut objects.