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ch. 18 motion and momentum
distance an object travels in a unit of time
total distance traveled divided by total time taken
speed of an object at an instant time
speed and direction of motion
change in velocity divided by the time it takes for the change to occur
amount of matter in an object
tendency of an object to resist a change in its motion
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