Is this in Safari or a hybrid mobile app? For hybrid mobile, I have used a setting in the config.xml file:
<!-- Stop the app from overscrolling and looking all bouncy -->
<preference name="DisallowOverscroll" value="true" />
<preference name="webviewbounce" value="false" />
Stackoverflow is a good source http://stackoverflow.com/questions/18799517/how-to-stop-uiwebview-bouncing-vertically-in-phonegap-3-0
I assume he tried this trick. Some say it works and some say it does not.