Published on: Wed Feb 17 20101. Law of inertia “Objects in motion tend to stay in motion, objects at rest tend to stay at rest” 2. Fnet= ma Net force equals mass times acceleration 3. For every action there is an equal and opposite reaction ~~~~So Far~~~~ The units of force is Kilograms meters per second squared, summarized as a Newton. That is to say, 1 Newton of force will accelerate 1 kilogram of mass by 1 meter per second squared. Weight is a force. It is the acceleration of gravity on the mass of an object. We use Free Body Diagrams to depict force on an object we want to think about. For right now we are focusing on Static objects. These are objects whose forces sum to zero. They are either not moving or moving at a constant velocity.