First commit

Assets/Scripts/Knife.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Knife : MonoBehaviour {
+
+    public float speed = 20f;
+    public AudioClip hitSound;
+    Rigidbody2D knifeRigid;
+    bool moving = true;
+
+	// Use this for initialization
+	void Start () 
+    {
+        // Identify Rigidbody
+        knifeRigid = GetComponent<Rigidbody2D>();
+	}
+
+	// Update is called once per frame
+	void FixedUpdate () 
+    {
+        if(moving)
+            knifeRigid.MovePosition(knifeRigid.position + Vector2.up * speed * Time.deltaTime);
+	}
+
+    void OnTriggerEnter2D(Collider2D collider)
+    {
+        // Stop knife moving, rotate with Trunk and play hit sound
+        moving = false;
+        transform.parent = collider.transform;
+        GetComponent<AudioSource>().PlayOneShot(hitSound);
+    }
+}

Assets/Scripts/SpawnController.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class SpawnController : MonoBehaviour {
+
+    public GameObject knife;
+
+	// Use this for initialization
+	void Start () {
+
+	}
+
+	// Update is called once per frame
+	void Update () 
+    {
+        // If left click or touch, create new knife game object
+        if (Input.GetMouseButtonDown(0))
+            Instantiate(knife, transform.position, Quaternion.identity);
+	}
+}