Making object fall over after death

I'm trying to write a piece of code which makes a gameObject, lets say a cube to fall after it's taken a set amount of damage.

Can I either use Mathf.Lerp or something to smooth the process of the fall? Or apply a rigidbody depends on a hit force applied when the object dies?

(I have another script which raycasts for hitting the object)

 #pragma strict
 
 var health : int = 100;
 var cube : Transform;
 
 function ApplyDamage (damage : int)
 {
  Health -= damage;
  
  if(Health <= 0)
  {
   Dead();
  }
 }
 
 function Dead()
 {
 // Can I have a smooth transform for the object to effects it's position?
 Mathf.Lerp?
 }