MENTAL MODEL · M4582

Action at a Distance

CultureHigh supportPhilosophy

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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

A phenomenon in which two objects can influence each other instantaneously without any intermediary (such as a field or particle). Newton's law of universal gravitation is a typical example of action at a distance: the gravitational force between two masses is instantaneous and does not require propagation time.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

Question the nature of causality. In classical physics, action at a distance is regarded as 'spooky' because it violates the principle of locality. However, in quantum mechanics, similar phenomena (such as entanglement) do exist. This reminds us that seemingly 'impossible' causal relationships may just be limitations of our understanding framework.

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Action at a distance refers to objects influencing each other instantaneously without an intermediary (as in the early conception of Newtonian gravity). After field theory and relativity, it was replaced by 'field/mediator + finite speed', eliminating the paradox of instantaneousness.

MINIMUM ACTION

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Practice this model in one real situation:

Identify whether a theory requires an intermediary for transmission. Describe interactions using fields (gravitational field, electromagnetic field). Resolve causal paradoxes with finite propagation speed.

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Source support: Explicit

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zh.wikipedia.orghttps://zh.wikipedia.org/wiki/%E8%B6%85%E8%B7%9D%E4%BD%9C%E7%94%A8ZH · Explicit
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