Quote:
Originally Posted by modest
PS - change is not a basic physics concept. Change is how humans think of movement. The more fundamental of the two is movement. More fundamental than movement is space and time.
|
That is entirely a belief, spoken from your personal worldview. There is no objective justification in the claim that one is more fundamental than the other, as you are merely talking about concepts that are defined in terms of each others.
Quote:
|
Change requires both space and time - two dimensions. It is impossible to describe change without both.
|
It is impossible to describe "time" without change. One can say "there's no time if nothing moves/changes in the universe".
That is because if there is a universe where nothing moves, there is nothing to hang any definition of "time" to; time cannot be defined/conceived in any valid way at all!
(and btw, from the point of view of explaining completely unknown stream of data, "change" is what makes the definition of motion & time possible... ...but that really says nothing about the real ontological reality)
The matter of the fact is that concepts like "movement", "time" & "change", are associated with each others; they are all understood against each others. That is why we can say "one cannot exist without another".
The reason why you should not say "nothing can move without time" is that it implies time is something that is moving forward in some sense even when absolutely NOTHING else is in the universe; it implies a completely naive realistic view of time.
(The alternative view (only semantically different) is that motion/change exists fundamentally - without cause - and gives rise to the definition of time)
Quote:
|
Speed is change in position divided by change in time. If it took the ball one second to change position then the ball moved at one meter per second.
|
Or it managed to move "one meter" while another apparatus managed to move its thin handle by 6 degrees. Just underlying the fact that "second" is not measurable by itself; what we see is how objects change around us in relation to each others. We cannot see any "rate" of time in any objective sense.
-Anssi
