Does Relativity of Simultaneity Imply Movement Before Action?

  • Context: Graduate 
  • Thread starter Thread starter member 529879
  • Start date Start date
  • Tags Tags
    Relativity
Click For Summary
SUMMARY

The discussion centers on the implications of the relativity of simultaneity in the context of two individuals signing a paper on a moving train. It concludes that while both individuals complete the task simultaneously from their perspective, an external observer perceives the person at the back finishing first. This raises the question of whether the back of the train is moving before the front, which is affirmed under the condition of constant speed. However, the discussion notes that this perspective does not fully incorporate the effects of Lorentz Contraction.

PREREQUISITES
  • Understanding of the relativity of simultaneity
  • Familiarity with Lorentz Contraction
  • Basic knowledge of special relativity principles
  • Concept of inertial reference frames
NEXT STEPS
  • Research the mathematical formulation of Lorentz Contraction
  • Explore the implications of simultaneity in different inertial frames
  • Study Einstein's theory of special relativity in detail
  • Examine real-world applications of relativity in modern physics
USEFUL FOR

Students of physics, educators teaching special relativity, and anyone interested in the foundational concepts of modern physics and their implications on motion and observation.

member 529879
Because of a the relativity of simultunaity, two people on a moving train both signing a paper will finish at the same time, but an observer watching the train go by will say that the person in the back finished first. Wouldnt this also mean that the back of the train is moving before the front of the train?
 
Physics news on Phys.org
Yes, but if the train is moving at a constant speed then that doesn't really matter.
 
  • Like
Likes   Reactions: member 529879
The rear of the train is further forward (closer to the front) than it otherwise would be. Doesn't properly account for the Lorentz Contraction, but interesting.
 
  • Like
Likes   Reactions: member 529879

Similar threads

  • · Replies 54 ·
2
Replies
54
Views
4K
  • · Replies 6 ·
Replies
6
Views
1K
  • · Replies 26 ·
Replies
26
Views
4K
  • · Replies 52 ·
2
Replies
52
Views
7K
  • · Replies 11 ·
Replies
11
Views
2K
  • · Replies 116 ·
4
Replies
116
Views
9K
  • · Replies 13 ·
Replies
13
Views
2K
  • · Replies 22 ·
Replies
22
Views
5K
  • · Replies 2 ·
Replies
2
Views
1K
  • · Replies 20 ·
Replies
20
Views
2K