How to relate kinematics of a moving frame and that of a laboratory frame?

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Discussion Overview

The discussion revolves around how to relate the kinematics of an object described in a moving frame to that in a fixed laboratory frame. Participants explore various transformations and the implications of different reference frames, including classical and relativistic contexts.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant asks about obtaining velocities and rotations of an object in a fixed frame given its properties in a moving frame.
  • Another participant suggests using the Euler transform as a potential method for relating the two frames.
  • A different participant emphasizes the need for clarity in the question, noting that information about an object in a certain frame typically assumes that frame is fixed relative to the object.
  • One participant proposes using the Galilean transformation for non-relativistic cases, while also mentioning the necessity of the Lorentz transformation for velocities approaching the speed of light.

Areas of Agreement / Disagreement

Participants express differing views on the assumptions underlying the question, with some emphasizing the need for clarity and others proposing specific transformations. The discussion remains unresolved regarding the best approach to relate the kinematics in the two frames.

Contextual Notes

There are limitations regarding the assumptions about the frames of reference and the conditions under which different transformations apply, particularly in relation to relativistic effects.

stevenphy2
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Hi all, if I have the velocities and rotations of an object with respect to a moving frame.
Are there relations that I can obtain the velocities and rotations of the object with respect to a fixed frame?
 
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Euler transform
 
I think you need to state your question more clearly edoctor.

Usually when you say that you have information about an object in a certain frame it presupposes that this frame is fixed relative to the object so no more velocities and so on need to be added into get the "real" information.. If you don't have the "real" information already, you don't have information about the object in this frame of reference...
 
Use the Galilean transformation. If there are velocities involved close to the speed of light, then you will need to include effects due to Einstein's relativity by using the Lorentz transformation.
 

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