Question Player movement

I wrote the following string:

void FixedUpdate()
{
rb.AddForce(0, 0, 500 * Time.deltaTime);
}

but eventhough I checked different tutorials the player doesn't move.

What's wrong? What I've to check?

Thnks a lot

 

Doesn't look like you assigned rb to anything, look at this example,

Code (CSharp):

1. using UnityEngine;
2.  
3. public class Example : MonoBehaviour
4. {
5.     Rigidbody m_Rigidbody;
6.     public float m_Thrust = 20f;
7.  
8.     void Start()
9.     {
10.         //Fetch the Rigidbody from the GameObject with this script attached
11.         m_Rigidbody = GetComponent<Rigidbody>();
12.     }
13.  
14.     void FixedUpdate()
15.     {
16.         if (Input.GetButton("Jump"))
17.         {
18.             //Apply a force to this Rigidbody in direction of this GameObjects up axis
19.             m_Rigidbody.AddForce(transform.up * m_Thrust);
20.         }
21.     }
22. }