Momentum
Part of speech: noun
Definition: (of a body in motion) the product of its mass and velocity. The impetus, either of a body in motion, or of an idea or course of events. (i.e: a moment)
Example sentence: It's all about starting momentum, hitting the ground running, and starting out hot.
Impulse
Part of speech: noun
Definition: A wish or urge, particularly a sudden one.The integral of force over time.
Example sentence: One impulse from a vernal wood May teach you more of man, Of moral evil and of good, Than all the sages can.