how to apply a force to a rigidbody to the direction code example

Example 1: how to make something addforce in the direction of something in untiy

dir = target.transform.position - transform.position;
dir = dir.normalized;
rigidbody.AddForce(dir * force);

Example 2: Rigidbody.addforce

using UnityEngine;public class ExampleClass : MonoBehaviour
{
    public float thrust = 1.0f;
    public Rigidbody rb;    void Start()
    {
        rb = GetComponent<Rigidbody>();
        rb.AddForce(0, 0, thrust, ForceMode.Impulse);
    }
}