Grumpy, thanks for your posts!Robittybob1
Yes, the length of a meter in any frame will be measured the same, but those frames moving relative to your frame will be seen by you as having meters that are shorter than yours, the faster they move, the shorter their meter.
Quantum Quack
To have relativity you must have two separate frames to be relative to each other. In your own frame of reference there can be no relationship(by definition), you are always at rest in your own frame, period. Anything you compare your frame with is, by definition, NOT in your frame, it is in a separate frame from yours(even if it is the mote of dust floating by your nose). That is not relativity, it is definition. Absolute rest does exist, it just must be narrowly defined and it only applies within that narrow definition. Absolute rest applied between frames is what does not exist(except in very narrow and specific definitions), absolute rest with your own frame is specified in the definition of a frame. Rest and motion have no effect on whether something exists, it is not intrinsic to existence. That all things are in relative motion with everything else is a RESULT of existence, not it's CAUSE.
Grumpy![]()
Think of a box with a few marbles inside it.
The marbles are traveling at 'c' bouncing around inside the box.
What would be you assessment of the rest status of the box?
1] relative?
2] absolute?
3] relative absolute?
Now given that the box itself is made up of energy that is also traveling at 'c'
how would that change your assessment?
The box and the marbles inside are all traveling at 'c.
Is the box then at relative rest, absolute rest or absolute relative rest?
I might add, I think and I may be wrong, that this is in some way a small step towards understanding how Einstein derived E=mc^2 as a necessary outcome of Minkowski/Einstein space time