Explain the unit of force in SI system.

The unit of force in the SI system is the Newton (N).

The Newton is defined as the amount of force required to give a mass of 1 kilogram an acceleration of 1 metre per second squared. This can be expressed mathematically as:

1 N = 1 kg x 1 m/s^2

In other words, if a force of 1 Newton is applied to an object with a mass of 1 kilogram, it will accelerate at a rate of 1 metre per second squared.

The Newton is a derived unit, meaning it is defined in terms of other base units in the SI system. Specifically, it is derived from the base units of mass, length, and time. This makes it a fundamental unit in the study of mechanics, which deals with the motion and forces of objects.

Other common units of force include the pound-force (lbf) and the dyne. However, these units are not part of the SI system and are not used in scientific calculations. It is important for A-Level Maths students to be familiar with the Newton as the standard unit of force in the SI system.