I want my Player to have collision physics

when my player get's hit by the enemy. the player stand's still i want it to be were if the player get's hit by the enemy the player will fall to the ground and rotate or go falling in the air think of it as if he was getting hit by a car. the player is using a Character Controller and a Rigidbody (Is Kinematic is on) the enemy has only a Rigidbody

Player Script

 public float jumpSpeed = 0.7f;
     public float gravity = 2;
     
     CharacterController controller;
     Vector3 currentMovement;
     
     // Use this for initialization
     void Start () 
     {
         controller = GetComponent<CharacterController>();
     }
     
     // Update is called once per frame
     void Update () 
     {
         if (!controller.isGrounded)
             currentMovement -= new Vector3 (0, gravity * Time.deltaTime, 0);
         
         else
             currentMovement.y = -9.81f;
         
         if (controller.isGrounded && Input.GetButtonDown("Jump"))
             currentMovement.y = jumpSpeed;
         
         controller.Move (currentMovement);
     }
 }

Enemy Script

  public float speed;
     
         void Start ()
         {
     
         }
     
         void FixedUpdate ()
         {
             rigidbody.velocity = transform.forward * speed;
         }
     }