# Shared Flashcard Set

## Details

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

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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