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Chapter 9 Vocabulary
Mr. Micmillens 9th grade Physical Science
14
Physics
9th Grade
10/22/2007

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Term
motion
Definition
an objects change in position  relative to a reference point
Term
displacement
Definition
the change of position in an object
Term
speed
Definition
the distance  traveled by an object divided by the time interval during which the motion occured
Term
velocity
Definition
the speed of an object in a particular direction
Term
acceleration
Definition
the rate at which velocity  changes over time; an object accelerates if its speed, direction, or both change
Term
force
Definition
an action exerted on a body in order to change the body's state of rest or motion; force has magnitude and direction
Term
friction
Definition
a force that opposes motion between the two surfaces that are in contact
Term
static friction
Definition
the force that resists  the initiation of sliding motion between two surfaces that are in contact and at rest
Term

kinetic friction

Definition
the force that opposes the movement of two  surfaces that are in contact and aresliding over each other
Term
inertia
Definition
the tendency of an object to resist being moved or if the object is moving, to resist a change in speed or direction
Term
free fall
Definition
the motion of a body when only the force of the gravity is acting on the body and velocity of an object
Term
terminal velocity
Definition
the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite...
Term
projectile motion
Definition
the curved path that an object follow when thrown, launched, or otherwise near the surface of the Earth
Term
momentum
Definition
a quantity as the product of the mass and velocity of an object is moving
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