http://www.merriam-webster.com/dictionary/momentum
1: a property of a moving body that the body has by virtue of its mass and motion and that is equal to the product of the body's mass and velocity
broadly: a property of a moving body that determines the length of time required to bring it to rest when under the action of a constant force or moment
2: strength or force gained by motion or by a series of events
Example: The wagon gained momentum as it rolled down the hill.
The essential American soul is hard, isolate, stoic, and a killer. It has never yet melted. ~ D.H. Lawrence
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