Metronomes Synchronizing: Entropy & the 2nd Law

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Discussion Overview

The discussion revolves around the phenomenon of metronomes synchronizing when placed on a floating base, exploring its implications in relation to the second law of thermodynamics. Participants seek to understand how this synchronization does not violate thermodynamic principles, particularly in the context of entropy and energy states.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant notes that the synchronization occurs because the metronomes share a floating base, which allows those out of phase to gradually shift closer to the majority phase.
  • Another participant suggests that the second law of thermodynamics pertains to random interactions, implying that the synchronization does not contradict this law.
  • A different participant emphasizes the role of coupled oscillators and energy modes, stating that the system naturally settles into the lowest energy normal mode due to the coupling losses.
  • There is a repeated inquiry about why this phenomenon might be perceived as a violation of the second law, indicating a need for clarification on this point.

Areas of Agreement / Disagreement

Participants express differing views on whether the synchronization of metronomes challenges the second law of thermodynamics. Some provide explanations that suggest it does not, while others question the assumptions behind the perceived contradiction.

Contextual Notes

Participants do not fully resolve the implications of the synchronization in relation to entropy, and there are varying interpretations of the second law's applicability in this context.

jeffinbath
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There is a fascinating demo on YouTube of "32 metronomes synchronizing". They are all started at different times but in barely more than 2 minutes they are all synchronized and working as one unit. If you have not seen this then go to Google and type in "metronomes synchronizing".
Could somebody explain to me why this phenomenon is not disobeying the 2nd Law please.
 
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Hi and welcome to PF! They are synchronizing because they share a floating base which causes those out of phase with the majority to shift closer to phase a little every cycle. The second law of thermodynamics is related to random interactions.
 
jeffinbath said:
There is a fascinating demo on YouTube of "32 metronomes synchronizing". They are all started at different times but in barely more than 2 minutes they are all synchronized and working as one unit. If you have not seen this then go to Google and type in "metronomes synchronizing".
Could somebody explain to me why this phenomenon is not disobeying the 2nd Law please.
Fail to wind them up and see what happens.
 
jeffinbath said:
Could somebody explain to me why this phenomenon is not disobeying the 2nd Law please.

Could you explain why you think it is?

You have 32 coupled oscillators with some losses in the coupling. So there's no surprise that you end up in the lowest energy normal mode.
 

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