Why won't my player movement script work?

Questions & Answers
1

using UnityEngine;

public class PlayerMovement : MonoBehaviour
{

public Rigidbody rb;
public float forwardForce = 2000f;
public float sidewaysForce = 500f;

// Update is called once per frame

//FixedUpdate makes physics smoother
void FixedUpdate()
{
    //Time.deltaTime makes game run the same on every FPS

    rb.AddForce(0, 0, forwardForce * Time.deltaTime);

    if ( Input.GetKey("d") )
    {
          rb.AddForce(sidewaysForce * Time.deltaTime, 0, 0, ForceMode.VelocityChange);
	}

    if ( Input.GetKey("a") )
    {
          rb.AddForce(-sidewaysForce * Time.deltaTime, 0, 0, ForceMode.VelocityChange);
	}
}

}

2

Try removing Time.deltaTime from your code. Because your are using FixedUpdate().