Newton's Three Laws of Motion

Newton's first Law is known as the law of inertia.  It states that a body will stay at rest or in uniform motion at a constant velocity unless it is acted upon by an external unbalanced force.  


Newton's second Law establishes a relationship between force, mass, and acceleration. Specifically it states that force is proportional to mass time acceleration.  The units of force are represented by a capital N which stands for a Newton.  Newtons are not a fundamental unit, but rather can be further decomposed into kilogram meters per second squared.

force = mass × acceleration = kg m/s² = N

Newtons third law states that for every force there is an equal and opposite reaction force.




Next:  Vectors