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# PS MFAE Chapter 2

### Force and Newton's Laws

TermDefinition
Force A push or a pull.
Balanced Forces When the sum of the forces acting on an object are zero.
Unbalanced Forces When the sum of the forces acting on an object is not zero.
Net Force The force that remains after all forces have been added together (both positive and negative).
Newton's First Law An object at rest tends to stay at rest and an object in potion tends to stay in straight-line motion unless a net force is applied.
Friction The force that resists relative motion of a body.
Equilibrium Rule An object experiences acceleration if and only if a net force is applied.
Weight The magnitude of the reaction force acting on an object.
Newton's Second Law An object's acceleration is directly proportional to the net force applied and inversely proportional to it's mass.
Static Friction Force of attraction between two or more solid objects that are not moving relative to each other.
Sliding Friction Force that results when two objects are moving relative to each other and rub together.
Rolling Friction Force resisting the motion when a body rolls on a surface.
Air Resistance Force resisting movement within a fluid. It is directly proportional to frontal surface area and directly proportional to viscosity of the fluid. Air resistance is directly proportional to the square of the speed of the object in the fluid.
Newton's Third Law For every action there is an equal and opposite reaction.
Created by: MrGross