Bobby has a notebook sitting on a desk. When he tilts the desk, it slides off of the desk. Which force causes it to slide off? * 1. speed
2.gravity
3.friction
4.acceleration

Use the drop-down menus to answer each question. which line represents the movement of a cart with a constant acceleration? a which line represents the movement of a cart with a constant velocity? c which lines represents a cart with no velocity or acceleration? b