The frictional force that air exerts on a moving object; acts in a direction opposite to the object's motion
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Balanced forces
Front
Forces that are equal in magnitude and opposite in direction
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Newton's 1st Law
Front
An object at rest will remain at rest, and an object in motion will remain in motion, ar constant velocity and in a straight line, unless acted upon by a net force; law of inertia
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Inertia
Front
The tendency of an object to resist a change in its velocity
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Newton's 3rd Law
Front
All forces come in action-reaction pairs; whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first; law of action and reaction
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Newton's 2nd Law
Front
The acceleration of an object is directly proportional to the net force applied, and inversely proportional to the object's mass; a = Fnet/m
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Force
Front
A vector quantity describing the push or pull on an object; measured in Newtons (N)
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Unbalanced forces
Front
Forces that combine to produce a net force that is not equal to zero and thus cause the velocity of an object to change
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Mass
Front
The quantity of matter an object contains; a measure of an object's inertia
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Newton
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The fundamental SI unit of force; the amount of force that will give an object of mass 1 kg an acceleration of 1m/s².
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Weight
Front
The force of gravity acting on an object; equal to the object's mass times the acceleration due to gravity (mg).