My coworker told me gravity isn’t a force it’s an effect mass has on space time, like falling into a hole or something. We’re not physicists, I don’t understand.
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Mass warps spacetime, and that warping of spacetime is gravity. The common analogy is imaging a bowling ball sitting on a really taught bed sheet. Where the ball sits will create a funnel, and if you rolled a marble or some small spehere in a straight line you can see how it quickly goes into an orbit like pattern.
Of course we don’t live in a 2d world, and the 3d version is difficult to imagine.
As to whether it’s really a force or not, I’m not sure. I feel like it’s kind of semantics at this point. We call it the 4th force but it behaves differently from the others and we have a unified theory of the other 3, but not gravity.
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