Throw Object

Hello Unity3D i have a Question about objects.How can i throw a prefab object?For Example.Whenever i throw a particle prefab it throws just fine.But whenever i throw a ball or a stick the prefab appears but it goes nowhere.Why is it that i can only throw a prefab particle and not a prefab game-object?If anyone knows how i can throw a prefab game-object.Can you please tell me how?

Heres The Script If anyone Needs it

 var rocket : GameObject;  //our prefab
 var throwPower : float = 10; //power variable determines how fast this object will be "shot out"variable 
 var reloadTime = 10; //time to reload
 var timeBetweenShots = 10.0;
 private var nextFire : float =0.0;
 private var timestamp = -10.0;
 function Update ()
 
 {
 if (Input.GetKeyDown("1")&& Time.time > nextFire) {
          if (Time.time > timestamp + timeBetweenShots ) {
               Debug.Log("I'm firing now");
               timestamp = Time.time;
 
 
 Switch();
 
         }
     }   
 }    
 
 function Switch()
 {
     yield WaitForSeconds(1);
 
 
 
  
 clone = Instantiate(rocket, transform.position, transform.rotation); //the clone variable holds our instantiate action
  
 clone.velocity = transform.TransformDirection(Vector3.forward * throwPower); //applies force to our prefab using the "forward" position times our throwPower variable
 
 
  
 }