Projectile motion
http://www.problemsphysics.com/mechanics/motion/animation/projectile.html
Component or tip to tail for adding vectors
http://www.physicsclassroom.com/Physics-Interactives/Vectors-and-Projectiles/Vector-Addition
Change order, see resultant
Guess as many vectors in given time
http://www.physicsclassroom.com/Physics-Interactives/Vectors-and-Projectiles/Vector-Guessing-Game
Projectile motion
Angle, range components
http://www.stmary.ws/HighSchool/Physics/home/animations3/Motion/VixViyAngle5.htm
Projectile motion