This document discusses dependent motions that occur when particles are interconnected by inextensible cords wrapped around pulleys. It provides three key points: 1) The motion of one particle depends on the motion of another connected particle, since the total cord length between them remains constant. 2) Equations can be derived relating the coordinates and velocities of connected particles based on the constant cord length. 3) For a specific example where block B moves upward at 6 ft/s, the speed of the connected block A can be determined using the equations relating their motions.