Etymological link between moments and momentum?

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Discussion Overview

The discussion explores the etymological connections between the terms "moment," "moment of inertia," "momentum," and mathematical moments. Participants seek to understand the origins and relationships of these terms within the context of physics and mathematics.

Discussion Character

  • Exploratory, Meta-discussion

Main Points Raised

  • Some participants inquire about the common origin of the terms "moment," "moment of inertia," and "momentum," noting that the first two seem easier to connect.
  • One participant references a Latin-English dictionary, suggesting that "momentum" derives from "movimentum," meaning movement or motion, and discusses its implications as a moving force or impulse.
  • A speculative reconstruction is proposed, suggesting that "momentum" may have been conceptually linked to weight and torque, with the idea that unbalanced weights cause tipping, thus relating to the term "moment."
  • Participants express frustration over the lack of responses and the long wait for engagement in the thread.

Areas of Agreement / Disagreement

The discussion remains unresolved, with no consensus on the etymological connections or the speculative ideas presented.

Contextual Notes

Participants have not fully explored the definitions or historical contexts of the terms, leaving assumptions and connections open to interpretation.

pellman
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What is the common origin of the terms:
(1) "moment" as in "moment of interia"
(2) "moment" as in the math terms first moment, second moment, etc.
(3) "momentum"?

The first two are somewhat easy to see, though I'd like see someone familiar with it spell it out. But I've always wondered about (3).
 
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Bump.

Anyone? How is momentum related to the concept of moment?
 
hi pellman! :smile:

my smith's latin-english dictionary (3rd edition, 1933) defines momentum, i, n, [contracted from movimentum, from the verb moveo, i move] as …

I. a movement, motion

II. a moving force, impulse

(both are supported by quotations from cicero and ovid)
 
pellman said:
What is the common origin of the terms:
(1) "moment" as in "moment of interia"
(2) "moment" as in the math terms first moment, second moment, etc.
(3) "momentum"?

The common origin is "momentum", which itself must be a contraction of a pre-existing latin word, as tiny-tim mentions.

The other meanings arose later.

A speculative reconstruction: 'momentum' was thought of as akin to weight. Weights on a pair of scales that are unbalanced make the scale tip over, hence 'moment' as akin to torque.
 
Last edited:
pellman said:
Bump.

Anyone? How is momentum related to the concept of moment?

pellman, I think you should get an award for having the longest patience...waiting 4 months before bumping a thread :biggrin:!

It chaps my hide when people do it after 20 minutes!
 

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