Here's why:

* Newton's Second Law: Force is defined by Newton's Second Law of Motion: F = m * a

* F is force

* m is mass (measured in kilograms, kg)

* a is acceleration (measured in meters per second squared, m/s²)

* Derived Unit: This means the Newton is a *derived* unit, meaning it's defined in terms of other fundamental units:

* 1 N = 1 kg * m/s²

Other Units:

While the Newton is the standard unit, other units are sometimes used:

* Dyne (dyn): A smaller unit, often used in physics. 1 N = 10^5 dyn

* Pound-force (lbf): Used in some engineering applications, especially in the US. 1 lbf ≈ 4.448 N

Let me know if you have any other questions!