bibliography

http://teachertech.rice.edu/Participants/louviere/Newton/law1.html cartons here http://www.youtube.com/watch?v=UVdqxYyFRKY&feature=player_embedded movie from isacc newton page http://www.youtube.com/watch?v=9EIZo9egyL4&feature=player_embedded movie from the laws of motion page http://animationlibrary.com/ other animations here