I have this grounded script and it doesn't work

so I have this script but it does not work with my parameter for my player_run and player_jump which grounded parameters. The script works on the player but not on the parameters

using UnityEngine; using System.Collections;

public class PlayerJump : MonoBehaviour { public bool grounded = true; public float jumpPower; private Rigidbody2D myRigidbody;

  // Use this for initialization
  void Start () 
  {
     myRigidbody = GetComponent<Rigidbody2D>();
  }
  
  // Update is called once per frame
  void Update () {
     // Do something
  
       if(!grounded && myRigidbody.velocity.y == 0) {
      grounded = true;
  }
  if (Input.GetMouseButtonDown(0) && grounded == true) {
      myRigidbody.AddForce(transform.up*jumpPower);
      grounded = false;
  }
  }
 
  void FixedUpdate ()
  {
     
     
     
  }

}