problem with the collider or mistake

Hi, i really want to know whether there is a problem with collision or my script, in my short project a sprite will move from bottom to top but it isnt being detected when colliding with a static body, and the code for both for the water movement script and end script is below
WatMov.cs :
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class WaterMov : MonoBehaviour {

// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {

transform.position+=(new Vector3(0.0f,(transform.position.y)*-0.50f*Time.deltaTime,0.0f));
Debug.Log ("X position:" + transform.position.x);
Debug.Log ("Y position:" + transform.position.y);
Debug.Log ("Z position:" + transform.position.z);
}
}


stageEnd.cs:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class stageEnd : MonoBehaviour {

// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {

}
void OnCollisionEnter2D(Collision2D colbj)
{
if (colbj.gameObject.tag =="objective")
{
Debug.Log ("entered");
Time.timeScale = 0;
}
}
}

 

Where's your rigidbody2d components? I believe those are required unless you are using trigger colliders.

 

it is already present for the moving object aka the water sprite