Testing Code for Unity

using UnityEngine.SceneManagement;

public class GlassTap : MonoBehaviour {

	public float speed = 30;
	//declaring sound variable
	private AudioSource snd;
	//declaring rigid body
	private Rigidbody rb;

	//not quite sure what this does
	private Transform trans;
	// Use this for initialization
	void Start () {
		//call rigid body
		rb = GetComponent<Rigidbody> ();
		//not quite sure how this grabs speed and uses it
		rb.velocity = Vector3.right * speed;
		//get sound
		snd = GetComponent <AudioSource> ();
		//I believe this calls the action on this particular object
		trans = this.transform;
	}

	//ask the sound to play on collision with the HandController
	void OnCollisionEnter3D(Collision col){
		if (col.gameObject.name == "HandController") {
			float y = calculatePosition (transform.position, col.transform.position, col.collider.bounds.size.y);
			Vector3 direction = new Vector3 (1, y).normalized;
			rb.velocity = direction * speed;
			snd.Play ();
		}
	}
}