Question

If gravitational force acts between all objects, why don't they move towards each other?

Answer 1

We know that gravitational force acts between each and every two objects.

We also know that differnt objects have $\textbf{different mass }$, means some can be heavy while some can be light.

So, regarding this theier body change thier position.

Answer 2

They do! But the truth is that gravity is super slow and super weak and so you need a gazillion atoms in order to observe any appreciable affect on a body. For two small bodies, such as atoms, they are more likely to be moved around by electrostatics (touch) or magnetism (also a kind of touch). The only reason we even recognize gravity as a “force” is because we’re talking at least one HUGE collection of atoms (planet, star, whatever).

Your body too is comprised of atoms, and is also being tugged at by all the atoms everywhere- even in other Galaxies. Gravity results from atoms all weakly pulling on each other. When atoms get close, each’s weak connection pulls at more angles, resulting in greater effective pull. This phenomena is well known to rock climbers building anchors (hang them low to minimize lateral tugging on the gear).



When you're near something big like a planet your atoms are being pulled in more directions (approaching 180 degrees on the horizon) than if it’s a galaxy far far away (0 degrees in this graphic). This fanning out of connections, rapidly accelerates your motion as you appear to “fall” toward the fanned out atoms of the earth