Free fall does'nt consider weight

[centenond]

Okay so first of all forgive me if I sound dumb, and forgive my english, is not my primary language.

So I know two objects will fall at the same rate if air is excluded, so what I am asumming its that free fall formula is only correct if there's no air, right?
So I am a programmer and I want to implement a little of physics, let's say a object weight 1 pound and another weights 10 pounds, I know it will fall at the same speed/rate , if there's no air? but what if i want to consider air, and weight, the heavier object from my logic will fall faster and will touch the ground faster.

So the free fall formula is not what I am looking for? what formula should i consider?
Thanks!

 

[Niladri Dan]

You should consider going through fluid mechanics... the force experienced is directly proportional to velocity...the velocity decreases exponentially until it attains a fixed velocity known as terminal velocity...

 

[PeroK]

So the free fall formula is not what I am looking for? what formula should i consider?
Thanks!

You could start here:

https://en.wikipedia.org/wiki/Drag_(physics)