Glossary of Physics 112 Ch4 Review

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Inertia -
The reluctance of an object to change its state of motion.
Equilibrium -
The state of a body or physical system at rest or in unaccelerated motion in which the resultant of all forces acting on it is zero.
Newton’s first law –
an object at rest will remain at rest, and an object in motion with constant speed will remain at constant speed unless acted on by an external unbalanced force (if ΣF = 0, then V = Constant).
Newton’s third law –
every action must produce an equal but oppositely directed reaction (F on A by B = -F on B by A).
Normal force –
a force that is perpendicular to the surface plane.
Friction force -
A force that resists the relative motion or tendency to such motion of two bodies in contact.
Equilibrant –
a force equal in magnitude to the resultant force but opposite in direction.
Reaction force -
An equal and opposite force exerted by a body against a force acting upon it.
Coefficient of friction –
ratio of the amount of friction by the surface and the normal force exerted by the force (μ f = Ff / N).
Static Friction –
A force that exist between two surfaces while motion is impending.
Kinetic Friction –
the frictional force between to surfaces while and object is moving.
Free body diagram –
A vector diagram which describes all forces acting in a particular body or object.

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