Follow these steps to disable/enable "rubber band" scrolling:
1. Click on the Apple () button on the top left corner of your screen and then click on "System Preferences".
2. Under the top row of icons titled "Personal", click "Universal Access" on the far right.
3. At the top of the newly opened screen you have four options to click ("Seeing", "Hearing", "Keyboard", and "Mouse and Trackpad"). Select "Mouse and Trackpad".
4. Select "Trackpad Options..." towards the bottom of the newly opened screen.
5. In this screen, "Scrolling" should be checked unless you have tampered with this option before. To the right of scrolling is a drop down arrow with two options: "with inertia" or "without inertia". Select "with inertia" if you would like the "rubber band" effect or select "without inertia" if you would like to remove the "rubber band effect".
6. Select "Done" and enjoy your new method of scrolling!