The act of moving forward (as toward a goal)(noun)
WordNet. Princeton University. 2010.
Use "forward motion" in a sentence
"He danced lightly to the side, so that Napper’s forward motion sent the deputy careening into one of the counter stools."
"Joyful stopped his own forward motion by grabbing hold of a line stretched from a deck-mounted block and tackle to one of the sails, hanging on and gasping for air."