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# 8th Unit 5

### Motion key Terms

TermDefinition
displacement an object’s overall change in position; the SI unit is the meter (m)
distance a measure of how far an object has traveled; the SI unit is the meter (m)
average speed an object’s total distance traveled divided by the time elapsed. The SI unit is meters/second (m/s)
average velocity an object’s displacement divided by time elapsed. The SI unit is meters/second (m/s)
constant velocity velocity that remains unchanged
instantaneous velocity the velocity of an object at a specific point in time
scalar a quantity having only magnitude, not direction
vector a quantity having direction as well as magnitude
average acceleration the rate of change of velocity divided by time elapsed. The SI unit for acceleration is meters per second squared (m/s2).
constant acceleration acceleration that does not change.
instantaneous acceleration acceleration at a given moment in time.
kinematics the science of describing the motion of an object.
free fall an object in motion only under the influence of the force of gravity.
Created by: darrin_evans