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PS9 Chapter 10 Motion - Terms
Chapter 10 Motion - Terms
9
Science
9th Grade
12/01/2008

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Term
motion
Definition
an object's change in position relative to a reference point
Term
displacement
Definition
the change in position of an object
Term
speed
Definition
the distance traveled divided by the time interval during which the motion occurred
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 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
kinectic friction
Definition
the force that opposes the movement of two surfaces that are in contact and are sliding over each other
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