Question

It is difficult to cut cloth using a pair of scissors with blunt blades. Explain.

Answer 1

Pressure

1. The force per unit area perpendicular to the surface is defined as pressure.
2. Mathematically, $P=\frac{F}{A}[whereP=pressure,F=force,A=area]$.
3. SI unit of pressure is Pascal $(Pa=N{m}^{-2}=kg{m}^{-1}{s}^{-2})$

Explanation:

1. In comparison to sharp-edged blades, blunt blades have a higher surface area.
2. According to the equation above, if the area is larger, more force must be used to get the same pressure.
3. As a result, cutting the cloth using a pair of scissors with dull blades is tough.