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Gravity is an attractive force that affects and is affected by all mass and - in general relativity - energy, pressure, and stress. Prefer newtonian-gravity or general-relativity if sensible.
1
vote
Accelerating a gravitational field
That's not even getting into how special relativity just fundamentally doesn't play nicely with Newtonian gravity. …
3
votes
Defining Free Fall: Does Gravity Need to be the Sole Force Present?
Newtonian Gravity:
For Newtonian gravity, you can just consider the net 3-force (force with three components, as taught in intro level physics) since no 4-force is defined. …