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# Forces Motion Laws

### Forces and the Laws of Motion

TermDefinition
Force a push or a pull in a certain direction
Inertia resistance to change in motion
Contact Force force that is effective only if direct contact is made
Field Force force that can be felt from a distance
Free Body Diagram diagram that shows all of the forces on a body
Net External Force the sum of forces on an axis
Action Reaction pair two equal and opposite forces on a pair of objects
Equilibrium an object who's net force is zero, or all forces on the object are balanced. The object is not accelerating.
Mass the amount of stuff that makes up an object
Weight a measure of the force of gravity
Friction force resulting from movement across a surface or through a fluid.
Normal surface force that is perpendicular to the surface
Coefficient of Friction a constant that depends only on the roughness of the surface
Law of Inertia an object at rest will stay at rest or an object in motion will stay in motion in a straight line until an unbalanced force acts on it
Newton's 2nd Law acceleration is affected by an object's mass and the force acting on it
Newton's 3rd Law for every action force, there is an equal and opposite reaction force
Created by: stamback