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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I’d suggest helping your friend expand their definition of a “force.” Try this definition: A force is any external effect that influences an object’s intertial (“rest”) state.
For gravity, it provides an external acceleration towards the center of the Earth. It also provides an acceleration towards the sun… and the moon.. and.. etc.
A ball rolling downhill is accelerating and being pulled along by a force. Even if gravity is caused by the curvature of spacetime, it still acts as a force on the surrounding universe.
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