Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Relativity of simultunaity

  1. Dec 7, 2014 #1
    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?
  2. jcsd
  3. Dec 7, 2014 #2


    Staff: Mentor

    Yes, but if the train is moving at a constant speed then that doesn't really matter.
  4. Dec 7, 2014 #3
    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.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Relativity simultunaity Date
I Magnetism and relativity Friday at 10:39 AM
A E field transformation in Feynman II_26 Mar 3, 2018
I How can General Relativity explain the Moon drifting apart from Earth Mar 3, 2018
A Lense-Thirring effect - General Relativity Feb 27, 2018