move towards the location natural to their composition (for fire, up above the layer of air; for rock or other solid matter, towards the center of the earth), second,
that motion in any other direction will end to cease (Koestler, 108-11). These "laws" do quite well in explaining a variety of motions: a cart will stop moving unless it is continually pushed or pulled, and if pushed off a cliff, it will drop until its downward motion is stopped short. They are thus highly intuitive; they also meshed comfortably with Archimedian statics: "heavy" things would tend to sink down; "light" things would tend to float upwards. Had the hot-air balloon been known to the Greeks, it would have been explained admirably by Aristotelian physics.
But these laws do not do very well in explaining the motion of a thrown rock,
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