Hey, I've recently had to implement scroll with momentum/inertia. It's actually incredible simple: 1) animate scroll with basic linear tween with short duration (eg. .15 s) - let it be tween A 2) create second tween with easeOut ease and way longer duration (eg. 1 second)- let it be tween B 3) when user scrolls, use tween A - basic scroll movement 4) whenever user stops scrolling launch tween B - you can measure time from the last event and decide if user has stopped scrolling