collistion detection with moving gameObject

HI how it is the collision detection with 2D? Because when tested on standard objects that scrip:

 `var prekazka = gameObject;
 function Start () {
 
 }
 function OnCollisionEnter2D(coll: Collision2D) {
     if (coll.gameObject.tag == "tag"){
     prekazka.transform.position.x = 80;
     
     }
     }`

all work fine, BUT when i use object with animation or "scrolling" script, collision detection cant work... how to use it? i making 2d gameI need to make objects move to that location in collision detection/enter/exit... Thanks