Here's why:

* Newton's Second Law of Motion: This law states that force is equal to mass times acceleration (F = ma).

* Units:

* Mass is measured in kilograms (kg).

* Acceleration is measured in meters per second squared (m/s²).

* Therefore, force is measured in kilogram-meters per second squared (kg*m/s²), which is defined as a Newton (N).

So, 1 Newton is the force required to accelerate a 1 kilogram mass at 1 meter per second squared.