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Chapter 8
Motion
12
Science
10th Grade
01/16/2008

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Term
speed
Definition

distance traveled divided by the time interval during which the motion occurred

Term
velocity
Definition
quantity describing both speed and direction
Term
momentum
Definition
a quantity defined as the product of an object’s mass and its velocity
Term
acceleration
Definition

change in velocity divided by the time interval in which the change occurred

Term
force
Definition
the cause of acceleration, or change in an object’s velocity
Term
balanced forces
Definition

forces acting on an object that combine to produce a net force equal to zero

Term
unbalanced forces
Definition

forces acting on an object that combine to produce a net nonzero force

Term
friction
Definition
the force between two objects in contact that opposes the motion of either object
Term
gravity
Definition
the attraction between two particles of matter due to their mass
Term
inertia
Definition

the tendency of an object to remain at rest or in motion with a constant velocity

Term
free fall
Definition

the motion of a body when only the force of gravity is acting on it

Term
terminal velocity
Definition
the maximum velocity reached by a falling object that occurs when the resistance of the medium is equal to the force due to gravity
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