Videos máquinas simples y complejas

http://www.youtube.com/watch?v=l_cc9Mgv3Ic&feature=related 
palanca
http://www.youtube.com/watch?v=28ZosNCAUKk&feature=related
polea
http://www.youtube.com/watch?v=_BGBwseLCmA&feature=related
planos inclinados
http://www.youtube.com/watch?v=SC7Gj8qASqc&feature=related
engranajes
http://www.youtube.com/watch?v=1-dhPXhbs-4&list=PL687CA85771A4D7D2&index=15&feature=plpp_video
motores