If something is inbetween two objects how do the particles know there is something bigger behind the object it needs to attract to?
In: Physics
You’d need something theoretical like negative-mass that pushes outward rather than inward to counteract gravity. The thing is, something like that would require a lot of energy even if we somehow had negative-mass readily available. Then you have the problem of being unable to control the direction of this mass. For example, if you wanted a hovering anti-grav car, nothing is stopping the anti-grav from pushing normal objects around it in every direction. It would be kind of like when a helicopter pushes everything away with the rush of air from its blades, but worse, because it’s also pushing up and to the sides in all directions instead of just down.
The best we can currently do is magnets, which is a different force that can locally push up against gravity. Thing is that’s limited to rails, so the future is electric maglev cars on rail unless we discover some new physics breaking technology.
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