Can't change Constant Force component

Hi!
I have wrote this script:

using UnityEngine;
using System.Collections;

public class BallMove : MonoBehaviour {
// Use this for initialization
void Start () {
ConstantForce cf = GetComponent<ConstantForce>();
cf.force.Set(0,0,1000);
}

// Update is called once per frame
void Update () {

}
}​

and attach it to my GameObject that have ConstantForce component.
But, after launching this script not change anything.
I tried to debug: variable cf get a link to right component, but after cf.force.Set(0,0,1000); nothing happend.
What is it? Help me, please.

P.S. Sorry for my English.

 

You need to add a rigidbody also to that gameobject.

 

Of course I did it! ))

 

ok, just wanted to make sure

Also, need to make sure that isKinematic is not enabled.

I've never seen force.Set()..how about
directly setting the value like this :

cf.force = new Vector3(0, 0, 1000);

 

yeah, thank you. it works.

 

Glad it worked..wondering which one worked...isKinematic or removing the Set() function ?

 

Second one.