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9 terms

ch. 18 motion and momentum

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speed
distance an object travels in a unit of time
average speed
total distance traveled divided by total time taken
instantanious speed
speed of an object at an instant time
velocity
speed and direction of motion
acceleration
change in velocity divided by the time it takes for the change to occur
mass
amount of matter in an object
inertia
tendency of an object to resist a change in its motion
momentum
measure of how hard it is to stop an object
law of conservation of momentum
total momentum of a group of objects remains constant unless outside forces act on the group