The iOS has this interesting feature while you’re scrolling: if you continue flicking while the page is still moving, no matter how slow it’s moving, or how minor the subsequent flicks are, the scrolling will accelerate cumulatively with every flick. It makes getting to the bottom of very long pages much easier.
But the software doesn’t care if the subsequent flicks are in the same direction, or even if you pause for a minute before continuing. If you catch the page mid-scroll, and your finger doesn’t leave the screen before your next flick, it will always be twice as fast, no matter how long you wait, or which direction you flick next time. It results in some really squirrelly behavior when you’re just trying to scan for something in a long text document…unless you’re aware of the behavior and know how to avoid it.