2. Pressure and thrust

 

It can be represented as, $\frac{F}{A}$

 

Where, \(F\) is force applied, and \(A\) is area of contact.

 

It can be measured in $\frac{\mathit{Newton}}{{\mathit{meter}}^2}=\frac{N}{m^2}$.

 

Force is measured in $\mathit{Newton}(N)$, and area is measured in ${\mathit{meter}}^2(m^2)$.

 

The Pressure exerted on a body depends on two factors,

The S.I. unit of pressure is $\mathit{Pascal}(\mathit{Pa})$.

 

$1\mathit{Pascal}$ is defined as $1\mathit{Newton}\mathit{per}\mathit{square}\mathit{metre}$.

 

It can be written as, $1\mathit{Pa}=1N{m}^{-2}$

 

From the above definition of pressure, pressure and area is inversely proportional, and pressure and force are directly proportional.

Let us take real-life examples. A knife has a very small and sharp edge to exert more pressure on the smaller area of the object to get the maximum effect from it.

 

 

From this, we can say that drilling a hole with a sharp nail is much easier when compared to the blunt one since the blunt has more area. Thus, needles, knives are designed with smaller surface areas to increase pressure at the end.

The skis to move in snow are provided with a larger surface area to have less pressure and controlled movement throughout. Similarly, the trucks have larger wheels to reduce the pressure of heavy machinery on the ground.