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Mar 8, 2017 at 19:28 vote accept AbeyMarquez
Mar 8, 2017 at 19:22 comment added AbeyMarquez @docscience ...And also, if the track was curved upward at some point that would explain your "effective" gravity idea since I would be accelerating up.
Mar 8, 2017 at 19:11 comment added AbeyMarquez @docscience Based on my inaccurate observations I had thrown out the possibility that it might have been an issue with the velocity vector, but now that I read all your answers I think that might be the case. Like you said, at those speeds, even a small rise or dip would feel significant. And even when I thought I wasn't feeling any vibration or wobble, it just may have been small enough not to feel like a vibration but enough to feel unstable as I walked. Thank you!
Mar 8, 2017 at 1:44 comment added docscience @sammygerbil reworded my answer; you are right if the grade is a straight ramp at constant forward speed. But even slight up and down curvature at bullet train speeds could cause subtle, uneasy feeling. Like an elevator.
Mar 8, 2017 at 1:41 history edited docscience CC BY-SA 3.0
fixed my answer according to sammy gerbil's comment; he was right
Mar 7, 2017 at 4:12 comment added sammy gerbil Constant velocity uphill does not increase the effective gravity, just as constant velocity upward in an elevator is undetectable. Only acceleration uphill could increase effective gravity. However, the passenger would actually be walking uphill if the train is pointing uphill, whether it is stationary or moving at constant velocity.
Mar 6, 2017 at 16:07 history answered docscience CC BY-SA 3.0