Question

A man applies a force of 20 N to kill a fly with a flat stick. If the area over which the force is acting is 2 $c{m}^2$, calculate the pressure on that area.

• A. ${10}^2$ Pa
• B. ${10}^3$ Pa
• C. ${10}^5$ Pa
• D. ${10}^7$ Pa

Answer 1

The correct option is C

${10}^5$ Pa

Given, Area = ${2cm}^2$ = 2 $\times$ ${10}^{-4}$ $m^2$

Force applied = 20N

Pressure = $\frac{Force}{Area}$

Pressure = $\frac{20}{2\times {10}^{-4}}$ = ${10}^5$ Pa.