Chapter1-3 Particle Motion Key word scalar positive vector negative unit vector scalar product magnitude vector product direction time interval leng ith instant coordinate axis curved line displacement line-segment distance arrow vector addition origin point component parallel vectors perpendicular componentsChapter1-3 Particle Motion scalar vector unit vector magnitude direction length coordinate axis displacement distance vector addition component vectors components positive negative scalar product vector product time interval instant curved line line-segment arrow origin point parallel perpendicular Key word: