Aristotelian physics

Natural sciences as described by Aristotle


A page from an 1837 edition of the Aristotle's Physica, a book addressing a variety of subjects including the philosophy of nature and topics now part of its modern-day namesake: physics.


Quotes are arranged alphabetically by author

A - FEdit

  • [T]he Aristotelian doctrine of inertia was a doctrine of rest—it was motion, not rest, that always required to be explained.
  • [T]he peculiar character of that Aristotelian universe... things... in motion had to be accompanied by a mover all of the time. A universe... [that] had the door half-way open for spirits...unseen hands had to be in constant operation... sublime Intelligences had to roll the planetary spheres... Alternatively, bodies had to be endowed with souls and aspirations... [M]atter itself seemed to posses mystical qualities.

G - LEdit

  • Gaukroger believes that contemporary physicists concern themselves with a kind of mathematical knowledge that“ is clearly not the same as that derived by abstraction from individual cases.” Indeed, he goes goes so far as to claim that true scientific knowledge, “cannot be attained, at least in [Aristotelian] physics and cosmology.
    • Louis Groarke (2009). An Aristotelian Account of Induction. p. 163
  • Let it be conceived that the [or a] particle acquires a tendency to move, and that nevertheless it does not move. It is then in a condition totally different from that in which it was at first. A cause competent to produce motion is operating upon it, but for some reason or other, is unable to give rise to motion. If the obstacle is removed, the energy which was there, but could not manifest itself, at once gives rise to motion. While the restraint lasts, the energy of the particle is merely potential; and the case supposed illustrates what is meant by potential energy. In this contrast of the potential with the actual, modern physics is turning to account the most familiar of Aristotelian distinctions—that between δύναμιζ [potential] and ένέργεια [action, effect, entelechy, power or energy].
    • Kurt Lewin. The conflict between Aristotelian and Galileian modes of thought in contemporary psychology, 1931. p. 143
  • Galileo's comprehension of the concept of acceleration, which he defined as a change of velocity either in magnitude or direction... was an abstract idea that no one seems to have thought much about before. And in using it to test the still accepted Aristotelian precept that a moving object requires a force to maintain it, Galileo easily demonstrated that it is not motion but rather acceleration which cannot occur without an external force. Deliberately rejecting common sense as a prejudiced witness, he let nature herself speak in the form of a "hard, smooth and very round ball" rolling down a "very straight" ideal groove lined with polished parchment, and then rolling up another groove, clocking each roll "hundreds or times"... he showed that, while downward motion (helped by gravity force) makes speed increase and upward motion (hindered by gravity force) makes speed decrease, there is always a "boundary case" in between... where speed remains constant (without any appreciable force)—and that, by reducing friction, this boundary case can be made to approach a horizontal level where gravity has no effect. Similarly testing... he also drafted a law of falling bodies: "that the distances traversed, during equal intervals of time... stand to one another in the same ratio as the odd numbers beginning with unity." And his beautiful analysis of a cannonball's trajectory into horizontal and vertical components... was one day to be of enormous help to Isaac Newton in solving the riddle of gravity.

L - REdit

S - ZEdit


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