text: what is the theory of motions of aristotle?   there is four statements.   (1) everything that is thrown upward will fall on the earth  because earth is the home of everything.   (2)the speed of fall of an object is proportional to its weight.    (3)an object dropped on air has faster rate of fall than in water because of the resisting force of the medium(air or water)   (4) natural motion causes violent motion