Here's why:
* Kilograms measure mass, not force. A kilogram is a unit of mass, which is the amount of matter in an object. Force, on the other hand, is a push or pull that can cause a change in motion.
* Newtons measure force, not mass. A Newton is the standard unit of force in the International System of Units (SI).
* Force and mass are related through Newton's Second Law of Motion: F = ma (Force = mass x acceleration). This equation shows that force is directly proportional to mass and acceleration.
* The choice of unit depends on the context:
* Engineers and scientists often use kilograms when working with mass directly. For example, calculating the weight of an object (which is the force of gravity acting on its mass) involves converting kilograms to Newtons.
* They use Newtons when specifically dealing with forces. For instance, when analyzing the forces acting on a bridge, designing a rocket engine, or studying the motion of celestial bodies.
In summary:
* Kilograms and Newtons are used for different quantities.
* While Newtons are the standard unit for force, engineers and scientists use kilograms when working with mass.
* They use both units depending on the specific application and context of the problem.
