Check out example codes for "unity oncollisionenter2d". It will help you in understanding the concepts better.
Code Example 1
void OnCollisionEnter2D(Collision2D col)
{
//This method will run when your 2D game object
//collides with something
Debug.Log("Collided");
}
Code Example 2
using UnityEngine;
using System.Collections;public class ExampleClass : MonoBehaviour {
void OnCollisionEnter2D(Collision2D coll) {
if (coll.gameObject.tag == "Enemy")
coll.gameObject.SendMessage("ApplyDamage", 10);
}
}
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