Classroom Aid - Special Relativity Postulates xx

[vesuvandoppelganger]

Ship1 at rest on top:



Ship2 at rest at bottom:



Here we have 2 ships passing each other and each diagram shows one of the ships at rest and the other one moving and length contracted. There is 1 moment when T of ship1 is lined up with N of ship2. This moment must be the same moment for both ship1 and ship2. If it isn't the same moment for both T of ship1 and N of ship2 then that means that T of ship1 is located somewhere else, according to ship1, when, according to ship2, T of ship1 is lined up with N of ship2, which means that T of ship1 has already passed or will pass N of ship2 so that is 2 events of T of ship1 passing N of ship2 which is clearly impossible. It also means that T of ship1 is simultaneously in 2 different places which is impossible. So this proves that the moment that T of ship1 and N of ship2 is lined up is the same moment in both the reference frame of ship1 and the reference frame of ship2. At this moment N of ship1 is located on opposite sides of T of ship2 simultaneously which is clearly impossible.

[TWJfdsa]

1:45 such as dark matter and dark energy and super strings and quarks?