Flick Gesture using RB2D velocity moves toward Anchor

I'm creating a netflix like slide/ flick browsing menu. I have a "Category" bar with many buttons on it that i am attempting to slide with the following.

Code (CSharp):

1. using UnityEngine;
2.  
3. public class TouchSlider : MonoBehaviour {
4.     private float start;
5.     private float end;
6.     private Rigidbody2D rb;
7.     private void Awake()
8.     {
9.         move = false;
10.         rb = GetComponent<Rigidbody2D>();
11.        
12.         start = 0;
13.         end = start;
14.     }
15.  
16.     private void OnMouseOver()
17.     {
18.    
19.         if (Input.GetMouseButton(0))
20.         {
21.            
22.             Vector3 mouse = Camera.main.ScreenToWorldPoint(Input.mousePosition);
23.             start = mouse.x;
24.             rb.velocity += new Vector2(start - end, 0);
25.  
26.             end = start;
27.  
28.         }
29.     }
30. }

If I just hold my finger on the slider bar it will align the anchor to my finger...
I'm not grasping why this is happening.

 

I figured out a solution:

Code (CSharp):

1. using UnityEngine;
2.  
3. public class TouchSlider : MonoBehaviour {
4.     private bool move;
5.     private float start;
6.     private float end;
7.     private Rigidbody2D rb;
8.     private void Awake()
9.     {
10.         move = false;
11.         rb = GetComponent<Rigidbody2D>();
12.         start = 0;
13.         end = start;
14.     }
15.  
16.     private void OnMouseOver()
17.     {
18.         if(Input.GetMouseButtonDown(0))
19.         {
20.             Vector3 mouse = Camera.main.ScreenToWorldPoint(Input.mousePosition);
21.             end = mouse.x;
22.             move = true;
23.         }
24.         if (Input.GetMouseButton(0))
25.         {
26.             Vector3 mouse = Camera.main.ScreenToWorldPoint(Input.mousePosition);
27.             start = mouse.x;
28.             rb.velocity = new Vector2( Mathf.Clamp( (start - end)* 4,-10,10), 0);
29.         }
30.     }
31. }