Length contraction: Is it permanent?

Click For Summary
SUMMARY

The discussion centers on the concept of Lorentz contraction, specifically whether the length of a rod, after being accelerated to 87% of the speed of light and then brought to rest, remains the same as another rod that was not accelerated. Participants agree that if both rods are accelerated Born-rigidly, their lengths will be perceived as the same by an observer at rest. However, if the rods are not accelerated in this manner, material modeling becomes necessary to understand the resulting lengths. The conversation emphasizes that length contraction is not a permanent change but rather a relative perception based on the observer's frame of reference.

PREREQUISITES
  • Understanding of Lorentz contraction and its implications in special relativity
  • Familiarity with the concept of Born rigidity in physics
  • Knowledge of relativistic speeds, specifically 87% of the speed of light (0.87c)
  • Basic principles of material modeling in physics
NEXT STEPS
  • Research "Born rigidity in special relativity" to understand its implications on length measurement
  • Study "Lorentz contraction and its effects on moving objects" for a deeper grasp of relativistic physics
  • Explore "material modeling techniques in physics" to comprehend how different materials respond to relativistic speeds
  • Investigate "the relationship between time dilation and length contraction" for a holistic view of relativistic effects
USEFUL FOR

Physicists, students of relativity, and anyone interested in the implications of relativistic motion on physical measurements and properties.

  • #31
Bertrand Boucquillon said:
I'm not looking to argue what the sun is made of
Neither are we. We are just pointing out that everything around you is made up of a mix of matter that has traveled at relativistic speeds relative to its current state and matter that has not. Your idea would have physical consequences that we don't see. It's a non-starter I'm afraid.

Edit: not to mention, what does an observer co-moving with the moving rod see? According to Bob the rod accelerated from rest. According to this new observer the rod decelerated to rest. Should it be showing these after-effects of length contraction (because it has decelerated according to the new observer) or not (because it hasn't yet decelerated according to Bob)?

Like I said repeatedly before I understand that everybody believes that length contraction doesn't change the physical properties and that it is about perception, but did you guys just accept it because it's what has been said by scientists 50 years ago or did you research the proof?
Please see my previous paragraph. And my previous post. And the post by Orodruin that you quoted...
 
Last edited:
Physics news on Phys.org
  • #32
Bertrand Boucquillon said:
Please be patient with me because I take this thread very seriously(I've been ignoring my customers for the past couple days just to focus on my research), I do hope you guys can keep an open mind about things and not get upset just because I'm questioning what is believed by the community.
There is an overwhelming amount of experimental evidence for the consequences of SR and GR. So much in fact that any description even attempting to build further must include them. This quoted text rings large warning bells to me as it seems to suggest you do not "believe" in the effects of relativity and therefore has started to work on your own theory. This is doomed to fail. The effects are well established experimental facts. Also note that Physics Forums, while encouraging asking questions to learn and understand, forbids the discussion of personal theories and speculation.

The original question has been answered several times over. I am therefore closing this thread.
 

Similar threads

  • · Replies 24 ·
Replies
24
Views
3K
  • · Replies 52 ·
2
Replies
52
Views
5K
  • · Replies 11 ·
Replies
11
Views
2K
  • · Replies 12 ·
Replies
12
Views
2K
  • · Replies 11 ·
Replies
11
Views
3K
  • · Replies 55 ·
2
Replies
55
Views
5K
Replies
4
Views
720
  • · Replies 60 ·
3
Replies
60
Views
5K
  • · Replies 20 ·
Replies
20
Views
2K
  • · Replies 13 ·
Replies
13
Views
2K