Vocabulary: What do you call spinning on the opposite axis?

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Discussion Overview

The discussion revolves around the terminology used to describe the axes of rotation for disks spinning in different orientations, specifically vertical and horizontal axes. Participants explore the implications of terms like "opposite polarity" in this context.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant describes two disks spinning on vertical and horizontal axes and questions the appropriate terminology for this scenario.
  • Another participant suggests that the axes can be referred to as "orthogonal" or "perpendicular" and interprets "opposite polarity" as rotating in opposite directions (clockwise vs. counterclockwise).
  • A third participant introduces terminology related to ellipsoids, mentioning terms like "minor axis," "major axis," and "semimajor axis," while noting that disks are not ellipsoids and that terminology can be confusing.
  • This participant also points out that "axial" and "radial" are common terms but may not be suitable for describing axes of rotation, suggesting a preference for ellipsoid terminology.
  • A link to a Wikipedia page on dihedral angles is provided, possibly as a reference for further exploration of related concepts.

Areas of Agreement / Disagreement

Participants express differing views on the appropriate terminology and the implications of terms like "opposite polarity." There is no consensus on a single term or definition, and the discussion remains open-ended.

Contextual Notes

The discussion highlights potential limitations in terminology and the challenges of accurately describing axes of rotation, particularly in distinguishing between different types of axes and their implications.

RabbitWho
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So imagine you have two disks, and from your perspective one is spinning on its vertical axis and the other one is spinning on its horizontal axis. What do you call that?

And what would it mean to "spin at the opposite polarity" if such a sentence makes any sense at all?

Thank you! Sorry if this is the wrong place, there isn't an "inane questions" section :(
 
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RabbitWho said:
So imagine you have two disks, and from your perspective one is spinning on its vertical axis and the other one is spinning on its horizontal axis. What do you call that?
I would call the two axes "orthogonal" or "perpendicular."
RabbitWho said:
And what would it mean to "spin at the opposite polarity" if such a sentence makes any sense at all?
To me, it would mean "rotate in the opposite direction, that is, clockwise versus counterclockwise, when looking along the axis from one 'end'".
 
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I think I know what you mean. This question leads to a lot of careful language in science papers. Most commonly the terminology of ellipsoids is used. "minor axis" "major axis" "semimajor axis". For a disk there is the minor axis and the other two are the same, both major, and arbitrary in exactly which radial direction. Of course disks aren't ellipsoids, so other language is used. "Axial" and "radial" are common, but those aren't used to describe axes of rotation. While "radial axis" may be decipherable "axial axis" would be terrible. Sometimes "Axis of symmetry" and "perpendicular to the axis of symmetry"

In the end cylinders and disks have an axis of symmetry that we already call an axis. Describing the axis of rotation is always going to trip on that. I say stick with the ellipsoids terminology.
 

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