Why isn't my collision working???

Unity Engine
1

Hello, I am making a game in which you are a ship that spins around in order to shoot approaching enemies.
I have two prefabs that i instantiate in this game; the enemy and the bullet.
I have no trouble instantiating each prefab, and no trouble with their movement, but what I am having trouble with instead is collision detection.

What I want is for the bullet to log something to the console(once I get this I will be fine on my own) but it just doesn’t seem to work.

public class shoot : MonoBehaviour {

    // Use this for initialization
    void Start () {
    
    }
    void OnCollisionEnter2D()
    {
        Debug.Log("hello");
    }
    // Update is called once per frame
    void Update () {
        Transform transform = this.transform;
        Vector2 position = transform.position;
        Vector3 rotation = transform.rotation.eulerAngles;

        float EulerAngle = rotation.z;

        EulerAngle /= 180;
        EulerAngle *= (float)Math.PI;
        position.x += (float)Math.Cos(EulerAngle) / 30;
        position.y += (float)Math.Sin(EulerAngle) / 30;
        this.transform.position = position;
        StartCoroutine("update");

    }
    IEnumerator update()
    {

        yield return new WaitForFixedUpdate();
        if (Math.Abs(this.transform.position.x)<10)
        {
            Update();
        }
        else
        {
            Destroy(this.gameObject);
        }
    }
}

This is the script for the bullet that is instantiated, and the only thing that isn’t working is the “OnCollisionEnter” near the top.
To be clear, I have a 2d circle collider and rigidbody on both the bullet and enemy.

Why doesn’t my code log “hello”?

2

You are using Rigidbody2D, right?

Also, what’s that coroutine code for? I think you could just replace it with:

void FixedUpdate()
{
    if(Mathf.Abs(this.transform.position.x)>10) Destroy(gameObject);
}
3

Hello, I messed with the rigid body settings a little bit and eventually got the collision to work. I am going to try what you said about removing the coroutine later today. Thanks!