Question

A $10N$ force is applied on a cube of side $2m$. Calculate the thrust $\left(T\right)$ and pressure $\left(P\right)$ acting on the cube .

• A. $T=5N$
  $P=10N$
• B. $T=5N$
  $P=5N$
• C. $T=10N$
  $P=2.5N$
• D. $T=2.5N$
  $P=10N$

Answer 1

The correct option is C $T=10N$

$P=2.5N$
Given:
Force, $F=10N$
Side of cube, $a=2m$

Hence, area of the surface is:
$A=a^2$
$A=2^2=4m^2$

Thrust is the force acting perpendicular to the surface.
$\therefore T=10N$

Pressure is defined as thrust acting per unit area.
$P=\frac{T}{A}$
$P=\frac{10}{4}=2.5N/m^2$