Question

Why is sharp knife more effective in cutting than a blunt knife?

Answer 1

1. Pressure is inversely proportional to the area of the surface, i.e., Pressure ∝ $\frac{1}{\mathrm{Area}}$
2. The effect of force is increased by decreasing the area on which it acts.
3. Hence, a sharp knife is more effective in cutting than a blunt knife because the area of contact in the case of a sharp knife is less.