Question

A girl is wearing a pair of flat shoes. She weighs 550 N. The area of contact of one shoe with the ground is 160 cm². What pressure will be exerted by the girl on the ground if she stands on two feet?

Answer 1

According to relation, $\mathrm{Pressure}=\frac{\mathrm{Force}}{\mathrm{Area}}$

Force of gravity = Weight of the girl = 550 N

Area of contact of one shoe = 160 cm²

Area of contact for both shoes = 320 cm² = 3.2 $\times$ 10^$-$2 m²

$\therefore$ Pressure = $\frac{550\mathrm{N}}{3.2\times {10}^{-2}{\mathrm{m}}^2}=1.72\times {10}^4\mathrm{N}/{\mathrm{m}}^2=1.72\times {10}^4\mathrm{Pa}$