Slippery material not slippery

The material is applied but the ground is not slippery. Why? (The friction is at 0)

I believe the material needs to be applied to a Rigidbody component, rather than a Collider component.
Correct me if I’m wrong.

That is incorrect, the PhysicsMaterial2D on the Collider2D will override the PhysicsMaterial2D on the Rigidbody2D. From the docs;

How are you moving your cube in this scene? Is your cube’s Rigidbody2D kinematic?

Good to know, thanks.

First I tried to use Physics Material change Dynamic and static Friction to zero. But then I realize that’s not the solution what you want.

    private void Update()

    {
        float moveH = Input.GetAxis("Horizontal");
        float moveV = Input.GetAxis("Vertical");

        Vector3 movement = new Vector3(moveH, 0.0f, moveV);

        GetComponent<Rigidbody>().AddForce(movement * 0.005f * Time.deltaTime);
    }

But I also found one reference online you can think about it because my codes do not consider the Layer.

using UnityEngine;
using System.Collections;
public class PlayerController2 : MonoBehaviour {
     public float speed;
     public float torque;
  
     void FixedUpdate () {
         float moveHorizontal = Input.GetAxis ("Horizontal");
         float moveVertical = Input.GetAxis ("Vertical");
         Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
         GetComponent<Rigidbody>().AddForce (movement * speed * Time.deltaTime);
         GetComponent<Rigidbody>().AddTorque (Vector3.up * torque * moveHorizontal);
         GetComponent<Rigidbody>().AddTorque (Vector3.up * torque * moveVertical); 
     }
     void OnTriggerEnter(Collider other){
         if (other.gameObject.tag == "IceFloor") {
             GetComponent<Collider>().material.dynamicFriction = 0;
         }
     }
     void OnTriggerExit(Collider other){
         if (other.gameObject.tag == "IceFloor") {
             GetComponent<Collider>().material.dynamicFriction = 1;
          
         }
     }
}

Here is the reference: How to create icy floor? c# - Questions & Answers - Unity Discussions