Question

(a) Define pressure.
(b) What is the relation between pressure, force and area?
(c) Calculate the pressure when a force of 200 N is exerted on an area of :
(i) 10 m²
(ii) 5 m²

Answer 1

(a) Pressure is defined as force per unit area applied in a direction perpendicular to the surface of an object.

(b) The relation between pressure, force, and area is given by following equation:
$\mathrm{Pressure}=\frac{\mathrm{Force}}{\mathrm{Area}}$
(c) (i) Area = 10 m²
Pressure = ?
Force = 200 N
$$\begin{gathered} \mathrm{Pressure}=\frac{\mathrm{Force}}{\mathrm{Area}} \\ =\frac{200}{10} \\ =20\mathrm{Pa} \end{gathered}$$
Ans: Pressure = 20 Pa.

(ii) Area = 5 m²
Pressure = ?
Force = 200 N
$$\begin{gathered} \mathrm{Pressure}=\frac{\mathrm{Force}}{\mathrm{Area}} \\ =\frac{200}{5} \\ =40\mathrm{Pa} \end{gathered}$$
Ans: Pressure = 40 Pa.