Why does gravity pull objects down?

Answer 1

The forces of gravity between two objects act along the line between their centers.

That means that gravity attracts the Earth toward the center of you, and it attracts

you toward the center of the Earth.

Now lets talk about "down":

"Down" is the short name we use for "toward the center of the Earth". Since that is

the direction in which we always experience the force of gravity, we tell each other

that gravity always pulls things 'down'.

Take a look at a globe some time, or even a grapefruit, and imagine billions of

people walking all over it, with everybody telling everybody else that gravity

pulls things 'down'. It should dawn on you pretty quickly that 'down' in Hawaii

and 'down' in central Botswana are two completely opposite directions. Same

for southern Chile and central Mongolia. "Down" completely depends on where

you are.

Answer 2

Gravity pulls objects down due to the force of attraction between two objects with mass. The Earth's mass creates a gravitational pull that causes objects to accelerate towards the center of the planet. This force is responsible for keeping objects, like us, firmly planted on the ground.