Acceleration vs De-acceleration

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Discussion Overview

The discussion revolves around the concepts of acceleration and deceleration, particularly in the context of motion in space without a personal frame of reference. Participants explore whether one can distinguish between accelerating and decelerating when perceived by an external observer.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants propose that acceleration and deceleration are essentially the same and depend on the observer's frame of reference.
  • Others argue that the distinction between acceleration and deceleration only exists when there is a reference point to compare against.
  • A participant questions the initial premise, suggesting that if one is moving at a constant velocity, there can be no acceleration, thus challenging the validity of the question.
  • Some participants express uncertainty about the original question, seeking clarification on whether the inquiry is about the difference between acceleration and deceleration or the ability to perceive changes in velocity without a frame of reference.

Areas of Agreement / Disagreement

There is no consensus on the distinction between acceleration and deceleration, with multiple competing views presented. Some participants agree that the concepts are relative to the observer, while others challenge the premise of the question itself.

Contextual Notes

Participants express varying assumptions about the nature of motion and reference frames, leading to different interpretations of the original question. The discussion does not resolve these assumptions or clarify the definitions of acceleration and deceleration.

multiix
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If you were to be moving in space at a constant V observed by a "stationary source". Say you had no frame of reference yourself, so you felt you were stationary, (but per observer you are moving at V)

If the observer sees you slow down to a stop. At that point can you tell whether you accelerated or de-accelerated.

Thank You
 
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I am not really sure what your asking here? are you asking if acceleration and deceleration are different? Or if you can tell if you change velocity if you are slowing down compared to a none accelerating (inertial)frame of reference?
 
darkhorror said:
I am not really sure what your asking here? are you asking if acceleration and deceleration are different? Or if you can tell if you change velocity if you are slowing down compared to a none accelerating (inertial)frame of reference?

Im asking whether you can tell the difference between the two if you have no frame of reference.
 
No, they are the same, it just depends on how you look at it. To someone you might be accelerating at the same time you will be decelerating to someone else. Really it's all just acceleration.
 
darkhorror said:
No, they are the same, it just depends on how you look at it. To someone you might be accelerating at the same time you will be decelerating to someone else. Really it's all just acceleration.

Thank You! I've been arguing this with a classmate. I got another supporter smile:
 
I would have to agree with darkhorror, the is only a difference between the two if there is a reference point. It really goes back to the bare basic physics principles. :)
 
multiix said:
If you were to be moving in space at a constant V observed by a "stationary source". Say you had no frame of reference yourself, so you felt you were stationary, (but per observer you are moving at V)

If the observer sees you slow down to a stop. At that point can you tell whether you accelerated or de-accelerated.
Your question is self contradictory. If you are moving at constant V then there is no acceleration.

Assuming that you meant that you were not moving at a constant V wrt the observer, or that you were initially moving at a constant V wrt the observer and then at some time t0 you decelerated to a stop relative to the observer, then the above responses are correct.
 
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