MacM:
Once again I am forced to try to teach you basic physics. I know it will go in one ear and out the other, but...
Postulate #1 of the theory of relativity is that "The laws of physics are the same in all inertial reference frames".
This means that if in one inertial frame you write an equation of physics, like F=ma or a Lorentz transformation or one of Maxwell's equations of electromagnetism, or an equation from quantum physics, you will not need to alter that equation for it to be true in any other inertial frame.
Take, for example, F=ma. In any inertial frame, if you add up all the forces acting on an object and divide by the mass of the object, you'll find the acceleration of the object in that frame. For comparison, consider a non-inertial reference frame, such as one that is accelerating. In that case, when you add up all the forces on an object and divide by the mass you DO NOT get the object's acceleration. In fact, in a non-inertial frame the object may have no forces on it at all and yet still be observed to accelerate. One way to "fix" the problem in a non-inertial frame is to modify the F=ma law. In a non-inertial frame we might write F + F' = ma, where F are the forces on the object and F' is an extra "imaginary" or "inertial" force that makes the equation work.
The important point here is that it is the
laws of physics that do not change between inertial frames.
Your silly claim that all physical
quantities remain the same in all frames is not covered by any theory of physics, and certainly not special relativity. In fact, if you look at post #778, you will see that spacetime coordinates of events are different in different frames. That doesn't mean the laws of physics are different. Moreover, all observers agree on all
events that occur, regardless of their frame of reference. They DO NOT agree on when and where in spacetime those events occurred, which is what relativity is all about.
The laws of relativity, along with the rest of the laws of physics, are the same in all inertial frames.
Now that I have educated you, re-read my statement from a previous post:
James R said:
The laws of physics are the same in all inertial frames. It's the number one postulate of special relativity. The fuse contracting is an effect of viewing it from different reference frames. It doesn't change the physics.
Hopefully, now that you have been educated, you will apologise for claiming that I was being inconsistent, and thank me for spending my valuable time attempting yet again to teach you basic physics.