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27. Natural Reality / A. Physics / 2. Movement

[explanation and source of why anything moves]

38 ideas
Thales must have thought soul causes movement, since he thought magnets have soul [Aristotle on Thales]
When musical harmony and rhythm were discovered, similar features were seen in bodily movement [Plato on Pythagoras]
All things are in a state of motion [Aristotle on Heraclitus]
It is feeble-minded to look for explanations of everything being at rest [Aristotle on Parmenides]
Love and Strife only explain movement if their effects are distinctive [Aristotle on Empedocles]
That which moves, moves neither in the place in which it is, nor in that in which it is not [Zeno of Elea]
There is no real motion, only the appearance of it [Diog. Laertius on Melissus]
Practical reason is based on desire, so desire must be the ultimate producer of movement [Aristotle]
If all movement is either pushing or pulling, there must be a still point in between where it all starts [Aristotle]
If the more you raise some earth the faster it moves, why does the whole earth not move? [Aristotle]
There is no point at all in the theory of Forms unless it contains a principle that produces movement [Aristotle]
It is hard to see how either time or movement could come into existence or be destroyed [Aristotle]
If movement can arise within an animal, why can't it also arise in the universe? [Aristotle]
When there is unnatural movement (e.g. fire going downwards) the cause is obvious [Aristotle]
Motion can't move where it is, and can't move where it isn't, so it can't exist [Diog. Laertius on Pyrrho]
If there were no space there could be no movement, or even creation [Lucretius]
Atoms move themselves [Lucretius]
Does the original self-mover push itself from behind, or pull itself from in front? [Sext.Empiricus]
If time and place are infinitely divided, it becomes impossible for movement ever to begin [Sext.Empiricus]
If all atoms, times and places are the same, everything should move with equal velocity [Sext.Empiricus]
Galileo mathematised movement, and revealed its invariable component - acceleration [Meillassoux on Galileo]
Motion is losing one place and acquiring another [Hobbes]
Newton reclassified vertical motion as violent, and unconstrained horizontal motion as natural [Harré on Newton]
Inertia rejects the Aristotelian idea of things having natural states, to which they return [Alexander,P on Newton]
2: Change of motion is proportional to the force [Newton]
3: All actions of bodies have an equal and opposite reaction [Newton]
1: Bodies rest, or move in straight lines, unless acted on by forces [Newton]
Motion is just change of distance between two things [Locke]
Maybe motion is definable as 'change of place' [Leibniz]
Motion is not absolute, but consists in relation [Leibniz]
All that is real in motion is the force or power which produces change [Leibniz]
Bodies are recreated in motion, and don't exist in intervening instants [Leibniz]
All motion is relative, so a single body cannot move [Berkeley]
Russell's 'at-at' theory says motion is to be at the intervening points at the intervening instants [Psillos on Russell]
Occupying a place and change are prior to motion, so motion is just occupying places at continuous times [Russell]
We perceive motion, and not just successive occupations of different positions [Harré/Madden]
If motion is change of distance between objects, it involves no intrinsic change in the objects [Lowe]
Maybe motion is a dynamical quantity intrinsic to a thing at a particular time [Sider]