Force = mass x acceleration.
Gravity has no mass (as far as we know) but it provides the acceleration (9.81 m/s^2 on earth). We call gravity “acceleration” because we don’t know what else it is. Frankly, it’s a rather embarrassing fact that science cannot say what gravity IS, even though we can describe, with ridiculous precision, what it DOES. Who knows, one day it might be considered a force. We won’t know for sure until we figure out what it is and why it exists.
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