Impulse
Part of speech: noun
Definition: A wish or urge, particularly a sudden one. The integral of force over time.
Example sentence: I think we all carry the seeds of our own destruction. You really have to be aware that just because something is good, it doesn't mean it's not going to trigger a self-destructive impulse.
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: Success is like a lightning bolt. It'll strike you when you least expect it, and you just have to keep the momentum going. You have to strike when the iron is hot. So for me, I just kept striking and striking to polish out the sword that I was making.