Why is gravity a pull?

Answer 1

The forces of gravity are always 'attractive' ... pulling masses together.

According to the math that describes the process, the forces of gravity would

push two objects apart if one of them were composed of 'negative mass' ...

just like one positive electrical charge and one negative charge repel each

other. So far, however, negative mass has never been observed, even in the

laboratory, and we don't see anything going on anywhere in the observable

universe where it appears as if objects are repelling each other.

Answer 2

Gravity is a pull because it is a fundamental force of nature that attracts objects with mass towards each other. This attractive force is responsible for things like the Earth's gravitational pull on objects near its surface, keeping them rooted to the ground.