this post was submitted on 05 Oct 2023
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[–] amanneedsamaid@sopuli.xyz 8 points 1 year ago (3 children)

This would be possible if there was a material unaffected by gravity, right?

[–] nucleative@lemmy.world 9 points 1 year ago (2 children)

I think in that case, the earth would just depart the location of the train, leaving it drifting in space.

[–] amanneedsamaid@sopuli.xyz 2 points 1 year ago

I was assuming the rails are strong enough to keep the train on the Earth, but I guess infinite friction from the movement and rotation of the Earth probably isn't survivable by any railway material. Hypothetically, if you had a material unaffected by gravity (train), and a material that is absolutely invincible (the rails, and they are anchored to the center of the Earth), now does it work?

[–] Zeth0s@lemmy.world 7 points 1 year ago* (last edited 1 year ago)

No, the problem is not gravity, is that the train attached to earth has velocity dictated by the Earth movements, and keeps it because of inertia. In your theoretical experiment, the train would be launched on space at constant velocity.