Question

Why is it easy to walk on sand with flat shoes, then with high heel shoes?

Answer 1

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

$\Rightarrow$ Pressure$\propto \frac{1}{Area}$

As high heel shoes have smaller contact area, hence it exerts high pressure and shoes go inside the sand. So it is difficult to walk on the sand with high heels. But for flat shoes, the contact area is more and hence less pressure is acting. Therefore, the shoes do not go inside the sand.