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Chapter 3
Key Terms
13
Science
9th Grade
05/13/2012

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Term
acceleration
Definition
the rate at which velocity changes with time; the change may be in magnitude or direction or both
Term
air drag
Definition
frictional resistance due to motion through air
Term
free fall
Definition
motion under the influence of gravitational pull only
Term
friction
Definition
the resistive force that opposes the motion or attempted motion of an object past another with which it is in contact, or through a fluid
Term
inertia
Definition
the property of things to resist changes in motion
Term
inversely
Definition
when two values change in opposite directions, so that if one increases and the other decreases by the same amount, they are said to be inversely proportional to each other
Term
kilogram
Definition
the fundamental SI unit of mass. one kilogram (symbol kg) is the mass of 1 liter (l) of water at 4* C.
Term
Newton's 2nd Law
Definition
the acceleration produced by a net force on an object is directly proportional to the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object
Term
mass
Definition
the quantity of matter in an object. more specifically, it is the measure of the inertia or sluggishness that an object exhibits in response to any effort made to start it, stop it, deflect it, or change in any way its state of motion
Term
terminal speed
Definition
the speed at which the acceleration of a falling object terminates because air resistance balances its weight
Term
terminal velocity
Definition
terminal speed with direction of motion (down for falling objects)
Term
volume
Definition
the quantity of space an object occupies
Term
weight
Definition
the force due to gravity on an object
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