The newton (N) is the derived unit of force. It is named after Sir Isaac Newton in recognition of his work. One newton is equal to the force needed to accelerate a mass of one kilogram one meter per second.

**Formula to calculate newtons.**

Mass is the amount of matter present in a body and its SI unit is kilogram (Kg).

Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity.

**Example:**

How much force is needed to accelerate a rolling stone of mass 0.25 Kg at 9.8 m/s^{2}.

Therefore, force needed is 4.9 N.