Which unit is specifically recognized as the unit of force in the SI system?

In the International System of Units (SI), the unit of force is the Newton. This unit is defined as the amount of force required to accelerate a one-kilogram mass by one meter per second squared. The relationship is rooted in Newton's second law of motion, which states that force equals mass times acceleration (F = ma).

Understanding how force is quantified helps in various applications, from engineering to physics. The Newton glides easily into calculations and is foundational in analyzing the forces acting on objects, whether stationary or in motion.

Other options are related but serve different purposes: the kilogram is a unit of mass, the Joule is a unit of energy (equivalent to the work done when applying one Newton of force over a distance of one meter), and the Watt is a unit of power, representing the rate at which work is done or energy is transferred. None of these define force, which is why the Newton is specifically recognized as the appropriate unit in the SI system.