Finding Moment About Any Point: Fixed Moment Value?

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Discussion Overview

The discussion revolves around the concept of calculating the moment about a point in a mechanical system, particularly focusing on whether a given moment value remains constant regardless of the point of reference used for calculation. The conversation touches on theoretical aspects of moments and their behavior in different contexts.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant asserts that if a moment is given as a fixed value (e.g., 50 Nm), it remains constant regardless of the point of reference chosen in the system.
  • Another participant agrees that if the moment is due to a couple (a pair of equal and opposite forces), then the moment is indeed the same about any point.
  • A third participant suggests using the parallel axis theorem, indicating a potential application in the context of moments of inertia, but clarifies that the discussion is about moments of force measured in Nm.

Areas of Agreement / Disagreement

Participants express differing views on the constancy of the moment value based on the type of forces involved, indicating that while some agree on the behavior of moments due to couples, there is uncertainty regarding the application of the parallel axis theorem in this context.

Contextual Notes

The discussion does not resolve the applicability of the parallel axis theorem to the moment of force versus moment of inertia, leaving some assumptions and definitions unaddressed.

385sk117
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The formula to find the moment about anypoint is
Fxr right? but if the moment is given, for example 50Nm
then the moment is fixed right? even if we change the regarding point
on the system, the given moment is 50Nm regardless what point we are regarding to.
Am I right?
 
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Hi 385sk117! :wink:

If it's a couple (ie, a pair of equal and opposite forces), then yes, its moment is the same about any point. :smile:
 
Hi Bob! :smile:
Bob S said:
Use parallel axis theorem. …

That would be for a moment of inertia …

this one is in Nm, so I 'm assuming it's a moment of force.
 

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