For the most part, "motion" and "movement" are synonyms. If the two words have different meanings, the difference is very subtle. I tend to think of "motion" as an ongoing "movement" and I think of "movement" as a "motion" that has ended or will end.
Mouvement veux dire un deplacement selin un point fixe dans l espace alors que motion est aussi un deplacementqui est etudié par description et la cause du mouvement