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Single Idea 18399

[filed under theme 8. Modes of Existence / C. Powers and Dispositions / 7. Against Powers ]

Full Idea

If masses are powers, the forces generated between two particulars have to vary inversely with the square of their distance apart. Have not the masses got to 'know' at what distance they are from each other, to exert the right amount of force?

Gist of Idea

How does the power of gravity know the distance it acts over?

Source

David M. Armstrong (Truth and Truthmakers [2004], 10.4)

Book Ref

Armstrong,D.M.: 'Truth and Truthmakers' [CUP 2004], p.140

A Reaction

This seems like a good warning against a simplistic account of powers doing all the work, but I suspect that more sophisticated physics would offer the fan of powers a solution here. The power is to 'spread' the force around.

The 18 ideas with the same theme [criticisms of the idea that there are 'powers' in reality]:

15983 Locke explains powers, but effectively eliminates them with his talk of internal structure [Locke, by Alexander,P]
13602 We cannot form an idea of a 'power', and the word is without meaning [Hume]
11950 We have no idea of powers, because we have no impressions of them [Hume]
11941 The distinction between a power and its exercise is entirely frivolous [Hume]
17772 Kant claims causal powers are relational rather than intrinsic [Kant, by Bayne]
14300 No physical scientist now believes in an occult force-exerting agency [Ryle]
11946 Propensities are part of a situation, not part of the objects [Popper]
18397 Powers must result in some non-powers, or there would only be potential without result [Armstrong]
18399 How does the power of gravity know the distance it acts over? [Armstrong]
17666 Actualism means that ontology cannot contain what is merely physically possible [Armstrong]
17667 Dispositions exist, but their truth-makers are actual or categorical properties [Armstrong]
17687 If everything is powers there is a vicious regress, as powers are defined by more powers [Armstrong]
8573 Most properties are causally irrelevant, and we can't spot the relevant ones. [Lewis]
14323 If every event has a cause, it is easy to invent a power to explain each case [Mumford]
14328 Traditional powers initiate change, but are mysterious between those changes [Mumford]
14331 Categorical eliminativists say there are no dispositions, just categorical states or mechanisms [Mumford]
14582 Might dispositions be reduced to normativity, or to intentionality? [Mumford/Anjum]
19014 How can spatiotemporal relations be understood in dispositional terms? [Vetter]