Question

The SI unit of thrust is $N{{m}^{-2}}$
A. True
B. False

Answer 1

Hint: Thrust is the perpendicular force applied on a surface. The SI unit of force is N (newton) the same will be that for thrust. Trust per unit area is known as pressure. The SI unit of pressure is $N{{m}^{-2}}$ or pascal (Pa).

Complete step by step answer:
The force applied perpendicular to the normal to the surface of a matter is termed as Trust. Thrust is also known as the reaction force described by the ${{3}^{rd}}$law of Newton (action-reaction). Thrust and force are calculated and measured by the international system of the unit (SI unit) in newtons (N). It is a vector quantity. The magnitude of trust can affect differently for different areas.
Example: When we stand on the sand on a beach our feet go deep into it. But on the other hand, when we lie on the same sand, no such effect is experienced.
In hydrostatics:
The total normal force exerted by the liquid on the given surfaces is termed as Trust.
Thrust applied per unit area is known as pressure on that surface.
Mathematically,
Pressure when 1N of trust is applied over a unit area of the surface is given by:
$\begin{align}
  & pressure=\dfrac{Thrust}{area} \\
 & p=\dfrac{1N}{1{{m}^{2}}} \\
 & p=N{{m}^{-2}} \\
\end{align}$
Thus, from the above explanation it is crystal clear that the SI unit of Thrust is N, and the statement mentioned in the question is false. $N{{m}^{-2}}$ is SI unit for pressure.
Do you know why a camel can run easily in Deserts but humans have to face a lot of difficulties while doing the same? This is due to the fact that camels have broad and flat feet. So, when they move in loose sand they exert less pressure on the sand as compared to humans.
So, the correct option is option B.

Note:
In aircraft, thrust is a mechanical force that is generated by the engines to move the aircraft through the air. It is used to overcome the drag of an aircraft, and to overcome the weight of the rocket in other words to work against gravity.