Define 1 Newton.

- Hint: Newton is the SI unit of force. Learn what is force and its formula then try to find MKS unit of force then compare newton and MKS unit of force then try to find what is newton. For this students should know what is acceleration and its unit then only they can find the MKS unit of force.

Complete step-by-step solution -

One newton is the force needed to accelerate one kilograms of mass at the rate of one metre per second squared in the direction of the applied force.
$\begin{align}
  & N=m\times a \\
 & 1N=1kg\times 1\dfrac{m}{{{s}^{2}}} \\
\end{align}$
The SI unit of force is called newton. The international System of units (SI) is the modern form of the metric system. It is the only system of measurement with official status in nearly every country in the world. It comprises a coherent system of units of measurement starting with seven base units. And the other units which are defined in terms of seven base units are called derived units.
Force is the derived unit. And force is a product of mass and acceleration.
The MKS Unit of Newton is $kgm{{s}^{-2}}$ and the dimension of newton is \[ML{{T}^{-2}}\] .

Additional Information:
Seven base units are as follows-


Other derived units-


Note: Students should learn and fit their mind that “Newtons is the unit of force”. It is very important in physics. We can derive dimensions and MKS units of some other physical quantities with the help of newton and seven base units.