Comparing Planetary Orbits & Rotations in Pictured Figures

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Discussion Overview

The discussion focuses on understanding the differences between two types of rotations depicted in an attached image, specifically relating to planetary orbits and the behavior of objects in those orbits. Participants explore concepts of rotation, yaw, and precession in the context of orbital mechanics.

Discussion Character

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

Main Points Raised

  • One participant seeks clarification on the differences between two types of rotations shown in the image, suggesting that planetary orbiting resembles the second figure.
  • Another participant questions whether the inquiry is homework and prompts the original poster to consider their own understanding of the differences.
  • A participant expresses confusion about the forces involved in rotation and yaw, suggesting that a moment about the center of a sphere is necessary for tilting during rotation, and questions why a rocket would yaw while orbiting a planet.
  • One participant identifies that the motion described may be precession rather than yaw, noting that the second figure depicts spinning on an axis that is precessing.
  • Another participant comments on the visual representation in the figures, questioning whether the dots represent axes of rotation and observing that one figure appears to show rotation while the other does not.
  • A participant reiterates the question of why an orbiting object would yaw, emphasizing that the orbiting body would have had initial angular momentum due to gravitational forces acting as a central force.

Areas of Agreement / Disagreement

Participants express varying interpretations of the figures and the concepts of yaw and precession, indicating that there is no consensus on the differences between the two types of rotations or the mechanics involved.

Contextual Notes

Participants reference specific forces and motions without fully resolving the underlying assumptions or definitions of yaw and precession, leaving some aspects of the discussion open to interpretation.

firavia
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I want to know the difference between the 2 types of rotations shown in the picture attached .

planetary orbiting are similar to the second figure in the picture attached , all i want to know what is the difference between the 2 figures .
 

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Is this homework? What do you think the difference is?
 
it is not a homework , I am lost between 2 facts . in order to have a tilting while rotating there must be another force that is causing a moment about the center of the sphere , in one case it exist in the other it dosent , if for example a rocket that has a certain thrust pass by a planet it would be affected by the gravitationl force for of the planet , why the rocket would yaw while it starts revolving around the planet , and if it won't yaw than it will come to a point where the thrust force will be opposed to the gravitational force , which is not the case in orbiting object satelite or rocket or whatever , cause while they are orbiting they yaw naturally and their thrust force will become tangential to the trajectory , that's what am not understanding properly , why the rocket or anything that is orbiting would yaw while it is revolving ? the second figure in my added picture u saw that the orbiting obejct did not yaw ...
 
firavia said:
I want to know the difference between the 2 types of rotations shown in the picture attached .

planetary orbiting are similar to the second figure in the picture attached , all i want to know what is the difference between the 2 figures .

That isn't yaw, its appears to be precession. The 2nd one is 'spinning' on its axis and its axis is precessing like a top in a gravity field.
..
.
 
I don't know if the dot on the olive looking things are meant to be the axis of rotation, but if not, it just looks like in one drawing the olive looking things are rotating and in the other, they aren't. It looks kinda like the way the moon rotates...
 
firavia said:
why the rocket or anything that is orbiting would yaw while it is revolving ? the second figure in my added picture u saw that the orbiting obejct did not yaw ...
The body orbiting the more massive body would have had an initial angular momentum. Because gravity between widely separated bodies is a central force.
 

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