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What allows gravity to pull in on things without using energy?

Answer 1

We don't really know ...

As of right now, we believe that the exchange particle called the graviton is responsible for the gravitational force, or gravity. We explain this by saying that the graviton is emitted from the posterior of large masses, and it travels behind an object in a manner similar to a boomerang, pushing the two masses together while maintaining momentum conservation.

The issue is that, despite string theory's predictions of gravitons' existence, no graviton has yet been observed, making them purely hypothetical at this point.

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Answer 2

Leah Abbate

Gravity is a fundamental force resulting from the mass of objects. It doesn't require energy to pull objects toward each other; it's a natural consequence of mass and the curvature of spacetime.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.