Voc.1:Forces of Newton's first law



   Forces: A push or pull exerted by one object on another.

      Friction: A foRces that opposes the motion of an object in contact with a surface.
     
      Drag forces: A forces that opposes the motion of an object though a liquid or gas.

      Gravity: A forces of attration that exist between all objects with mass. 

       Net forces: The combined effect of all the forces acting on an object.

       Balanced forces: Balanced forces are when there are equal forces pushing on an object.

       Unbalances forces: Forces that do not cancel each other out when acting together on a single object.

       Inertia: The tendency of an object to oppose a  change in motion.

       Momentum: The mass of an object multipled by its velocity .