What does the force of gravity between two objects depend on?

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Lastly, the force of gravity between two objects depends on their mass and the distance between them. Simply, gravity pulls toward the centre of mass of an object. For us to stay on planet earth, we need gravity to pull us down towards the center of the planet and this is what we see happening every day, and due to the constant sphere-shaped planet, there is always the same amount of earth beneath us which can be seen as the diameter or radius of a circle. If this were to happen on a flat earth, we would simply be dragged ferociously to the middle of our planet since the centre of mass of a flat-plane similar to that described as a flat earth, is the middle of the shape....
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