Applied Force, FA
a force that is applied to an object by another object
Gravitational Force, Fg
The force that attracts all objects to Earth
Frictional Force, Ffr
the force that opposes the relative motion of surfaces sliding against each other
Air Resistance Force, Fair
the force that air particles apply to an object that is moving through the air
Normal Force, FN
the force that a surface applies upward on an object that is resting on it
Buoyant Force, FB
is the upward force exerted by a fluid on any object immersed in the fluid
Tension Force, FT
the force transmitted through a rope, string, wire, or chain when it is pulled tight