Add force in direction of collision

i am trying to make a pool/billiards game and am trying to add a force in the opposite direction of a collision. this is what ive come up with but it does not work. please help me out
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Text;
using UnityEngine.EventSystems;

public class Cue : MonoBehaviour
{


    public Rigidbody CueRB;

    //    // Start is called before the first frame update
    void Start()
    {
     
    }

//    // Update is called once per frame
    void Update()
    {
        if(Rigidbody.OnCollisionEnter(Collision))
        {
            CueRB.AddForce(Collision * Time.deltaTime, 0, Collision * Time.deltaTime);
        }
       

        
    }
}

Please search for some Collision Code examples and take a close look at how that is done properly.
This just is not how you implement the callback “OnCollisionEnter”.

What you need instead is something like this:

 public void OnCollisionEnter(Collision col)
         {
             CueRB.AddForce(col.GetContact(0).normal);
         }

Please also try to understand how function arguments work. You always need a type (Collision) followed by a name (col). Just writing “Collision” will not do the trick.

In addition to that please try to read into Time.deltaTime usage. If you have a continuous force or movement - multiply with Time.deltaTime. If you have single instances of force being applied then do not multiply with Time.deltatime.