An electronic device displays a plurality of user interface representations in a stack on a display. The device detects a first drag gesture by a first contact at a location on a touch-sensitive surface that corresponds to a location of a first user interface representation on the display. While the first contact is at a location on the touch-sensitive surface that corresponds to the location of the first user interface representation on the display and is moving across the touch-sensitive surface in a direction that corresponds to a first direction on the display, the device moves the first user interface representation in the first direction on the display at a first speed in accordance with a speed of the first contact on the touch-sensitive surface and moves a second user interface representation, disposed above the first user interface representation in the stack, in the first direction at a second speed greater than the first speed.