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About sgabc123

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  1. If that question was for me, I have no idea. It was purely a thought experiment with no regard for how one could even theoretically accomplish such a thing.
  2. Remember when I said I've usually gone off the rails early... I think my fundamental realization of this is just that - acceleration requires an interaction, which requires more than one reference, and thus involves proper "real" quantities and effects. Thanks! Scott
  3. OK, but isn't that an interaction, or at least modeled as an interaction - exchange of virtual photons?
  4. I would say that if velocity changes NO objects will "feel" the acceleration, at least not at the fundamental particle level. What you're describing seems to me an emergent phenomenon. An accelerometer only "feels" acceleration because of interactions between particles. An accelerometer works when you apply force to the housing, the housing changes velocity before the sprung mass. Because of the relative change in velocity between the housing and the sprung mass, there is a measurable difference in the position of the sprung mass relative to the housing. Individually, all 100% re
  5. I feel like I'm challenging my betters here, but forgive me, I'm still hung up on this relativity thing. I see no reason why acceleration would ever be absolute. My first misstep here was assuming acceleration has something to do with resolving the apparent twin paradox. I have come to believe it doesn't, not directly anyway (Dr. Lincoln from Fermilab): https://www.youtube.com/watch?v=GgvajuvSpF4 I also incorrectly believed that acceleration causes time dilation, but it doesn't (again, at least not directly). https://www.physicsforums.com/threads/does-acceleration-cause-time-
  6. I was trying to keep things as simple as possible. But if motion is relative, is not the direction of motion relative, only relevant in relation to a specific observer, the same as the magnitude? I think I'm too hung up on a strict adherence to the idea of relativity. I haven't had time to really digest some of the answers, particularly proper speed, proper acceleration, proper vs coordinate quantities. I think that's the next thing I'll try to explore to see if I can understand what/why some things are absolute. Thanks all! Scott
  7. This is what's breaking my brain. If there is no cosmic stage, if speed is only meaningful relative to other things, how can change in speed be absolute/not relative? What really is changing? I'll look up proper quantities and coordinate quantities. Is this concept one of those things that can be understood intuitively, or is it one of those things that the math works, and there really isn't much to be gleaned by asking why? Thanks a bunch, it's very fun for me to explore this stuff, even if it doesn't come easily! Scott
  8. I'm having a read through https://www.physicsforums.com/threads/does-acceleration-cause-time-dilation.237212/. I simply don't understand the fundamentals of acceleration, time dilation, differential aging, to really grasp what the twin paradox and the solutions actually mean. Thanks for the replies, lots to think about. Scott Perhaps this will inch me forward. It's my understanding that all motion is relative. That there is no cosmic 'stage' by which absolute motion can be measured. Say I'm the only thing in the universe, just floating in space. I have a baseball,
  9. Usually when I have these long trains of thought, I've gone off the rails early and rest is nonsense. Hopefully this all makes sense, but I at least hope someone can put me back on the rails so I can try again. The precursor to all this was thinking about the twin paradox. I get it - sort of. I believe the math works out, and I believe that there isn't really a paradox. But I feel like I'm watching shadows - I get the general idea, but I can't see the finer details. I don't like the explanation that one twin was in a single inertial frame and the other went through multiple fra
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