Specifically... The direction of scrolling through the list of items may be reversed in response to the scrolling intersecting a virtual boundary corresponding

Specifically... The direction of scrolling through the list of items may be reversed in response to the scrolling intersecting a virtual boundary corresponding to a terminus of the list. The scrolling reversal may correspond to a damped motion. For example, during scrolling, a displayed portion of the list of items may appear to bounce off of a boundary of the window in the touch-sensitive display when a beginning or an end of the list of items is reached. The apparent bounce may correspond to a simulation of a viscous or elastic ball having momentum in a first direction striking an immovable and/or inelastic object, such as a wall. The subsequent motion of the ball may be damped, for example, by including a friction or dissipative term in the simulation. A parameter corresponding to the friction term in the simulation may be adjustable, allowing the ball to reach equilibrium in contact with the wall, i.e., the virtual boundary, or displaced from the wall. -- "Ording" (2005) U.S. Patent No. 7,786,975 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=7,786,975.PN.&OS=PN/7,786,975&RS=PN/7,786,975 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=H...