Resource: Unit Two

In Unit Two, I struggled most with the concept of falling at an angle.  To help me better understand this topic, I found these helpful diagrams from the ever-trusty "physicsclassroom.com"

Each of these pictures shows the process an object (or a cannonball, in this case) would take when the forces of both gravity and horizontal velocity are acting on it.  I think each picture demonstrates something important in one's understanding of projectile motion. 

Sources: 

http://www.physicsclassroom.com/class/vectors/u3l2a.cfm

http://www.physicsclassroom.com/class/vectors/u3l2b.cfm

http://www.physicsclassroom.com/class/vectors/Lesson-2/Horizontal-and-Vertical-Components-of-Velocity