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Motion
Chapter 4 Motion
8
Science
9th Grade
11/21/2011

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Term
Speed
Definition
Describes how quickly an object moves, calculated by dividing the distance traveled by the time it takes.
Term
Average Speed
Definition
Total distance divided by the total time for a trip.
Term
Instantaneous Speed
Definition
Actual speed of a moving object at any moment.
Term
Velocity
Definition
A variable that tells you both speed and direction.
Term
Constant Speed
Definition
Speed that stays the same.
Term
Acceleration
Definition
Rate at which velocity changes.
Term
Free Fall
Definition
Accelerated motion that happens when an object falls with only the force of gravity acting on it.
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