Spin Tops: Why Do They React 90° Later?

  • Context: Undergrad 
  • Thread starter Thread starter Rockazella
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Discussion Overview

The discussion revolves around the behavior of spinning tops and their reaction to applied forces, specifically the phenomenon where they appear to respond 90 degrees later. Participants explore the concept of precession and the underlying mechanics involved.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant expresses confusion about the term "90 degrees later" and suggests that the axis of a rotating body moves perpendicular to the applied force, indicating a need for complex calculations to analyze the behavior.
  • Another participant identifies the phenomenon as precession and notes that understanding it fully requires mathematical analysis, mentioning vector analysis and higher-dimensional mathematics.
  • A participant quotes a poetic reflection on the mysteries of physics, linking the behavior of spinning tops to broader questions in physics, but does not provide a technical explanation.
  • A later reply questions the origin of the quoted statement, seeking clarification on its significance or authorship.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the explanation of the phenomenon, with some expressing confusion and others providing insights that remain unverified and debated.

Contextual Notes

The discussion highlights the complexity of the topic, with references to advanced mathematical concepts and the need for detailed calculations that are not fully explored in the thread.

Who May Find This Useful

This discussion may be of interest to those studying angular momentum, precession, or the mathematical frameworks used in physics, as well as individuals curious about the conceptual challenges in understanding rotational dynamics.

Rockazella
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I'm not sure what this behavior is technically called, but why do spinning tops (or anything else with some angular momentum) react to forces put on them 90 degrees later?
 
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"90 degrees later" I can't understand.
I guess that the axis of rotating body moves in the direction perpendicular to the direction of the force exerted on the body. To analyze this problem, we need to calculate tedious equations of rotating solid body. I don't have time and patience enough to get the correct answer. Sorry!
 
It's called precession. It's hard to see how it works without math. Vector analysis in 3-D gives a sort of view of it, but to really get it you have to study six dimensional simplectic math.

Three things are mysteries, yea three things I know not: the way of particles when entangled, the way of the universe when accelerated and the way of a top when forced.
 
Originally posted by selfAdjoint
Three things are mysteries, yea three things I know not: the way of particles when entangled, the way of the universe when accelerated and the way of a top when forced.

Is this a quote from anyone of consequence?

eNtRopY
 

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