Yep, I was thinking about a proton. I probably should have been more explicit.
Is the particle moving or is the coordinate system?
It seems, like you say, to be arbitrary. Without something else in the universe, the particle could have any rotation, velocity, inertia, etc... depending on which coordinate system you choose. The coordinate system seems to be layered on, from a universe where the idea of space and time were more useful.
Is the particle moving or is the coordinate system?
It seems, like you say, to be arbitrary. Without something else in the universe, the particle could have any rotation, velocity, inertia, etc... depending on which coordinate system you choose. The coordinate system seems to be layered on, from a universe where the idea of space and time were more useful.