ScrollRect.elasticity

Description

The amount of elasticity to use when the content moves beyond the scroll rect.

The default is 0.1. Elasticity is only used when the movementType is set to Elastic.

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class ExampleClass : MonoBehaviour
{
    public ScrollRect myScrollRect;

    public void Start()
    {
        // assigns a new value to the elasticity of the scroll rect.
        // The higher the number the longer it takes to snap back.
        myScrollRect.elasticity = 3.0f;
    }
}