Particle System Prefab on collision?

Ok so I am VERY new to unity and am trying to initiate a short particle system animation when my player (which is a ball) collides with a gameobject cube. I honestly have no idea where to start so it would be much appreciated if someone could help me out in really dumbed down terms. So heres what I have for my player.

 using UnityEngine;
 using System.Collections;
 
 public class PlayerController : MonoBehaviour {
 
     public float speed;
 
     private Rigidbody rb;
 
     void Start ()
     {
         rb = GetComponent<Rigidbody>();
     }
 
     void FixedUpdate ()
     {
         float moveHorizontal = Input.GetAxis ("Horizontal");
         float moveVertical = Input.GetAxis ("Vertical");
 
         Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
 
         rb.AddForce (movement * speed);
     }
 
     void OnTriggerEnter(Collider other) 
     {
         if (other.gameObject.CompareTag ("Pick Up"))
         {
             other.gameObject.SetActive (false);
         }
     }
 }

And heres the object I want to emit the animation. ( I also have more that I want to do the same thing if that helps)

 using UnityEngine;
 using System.Collections;
 
 public class Rotator : MonoBehaviour {
 
     void Update () 
     {
         transform.Rotate (new Vector3 (15, 30, 45) * Time.deltaTime);
     }
 }

So if someone could please help out this hopeless beginner I would really appreciate it.