'''Momentum''' is "strength or force gained by motion or by a series of events" [http://www.merriam-webster.com/dictionary/momentum]
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*The company has had a successful year and hopes to maintain its momentum by introducing new products.
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*The movie loses momentum toward the end. [http://www.merriam-webster.com/dictionary/momentum]
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[[Mason Currey]] writes about
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:. . . the importance of momentum. When I get straight down to something really important early in the morning, before checking email, before interruptions from others, it beneficially alters the feel of the whole day: once interruptions do arise, they're never quite so problematic.
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There's something about starting and continuing a project: the mental energy you get when you keep going. It sustains you. Every bit of work you do provides feedback that makes you want to do some more.