ARISTOTLE ON MOTION
1.Contrast Aristotle's ideas of natural motion?On violent motion?
Natural motion by Aristotle view was every object in the universe had a proper place determined by this "nature"; any object not in its proper place would "strive" to get there.
In contrast excerpt from WILLIAM OCKHAM. there are no essential. necessary "natures" or universals that determines what an individual things or "particular" must be.Similarly between individuals (for example, individual people or planet0 are simply a matter of fact, of their contingent ordering by divine will,not of metaphysical necessity.
On Aristotle's view that Larger objects were thought to strive harde, thought to fall at speeds proportional to their weights the heavier the obects,the faster it was thought to fall.
In contrast excerpts from GALILEO experiment at Leaning Tower which he shows logically that stones regardless of weights fall to the ground at the same speed and time.

Violent motion by Aristotle view was  it result from pushing and pulling forces.It is an imposed motion to keep an object to move.
In contrast excerpt from GALILEO experiment on inclined, sloped upward and downward and no slope plane.And the object after pushing or pulling will continue to move in a straight line forever;no push or pull at any kind is needed

2.Did Aristotle think that a force acts on the moon as it circles the earth?Yes
On earth, did he think a force keeps a ball rolling along a smooth, level surface?.No.