Crank and slider, Chain and sprocket systems and ratchatet ( By Lucía Horcajo)
http://technology2apl.blogspot.com.es/2017/04/mechanisms.html
Belt and pulley system, Screw and nut and Wedge ( By Andrea Caballero)
http://andreastechnologynotebook.blogspot.com.es/2017/05/mechanisms-workshits.html
Gears, Rack and pinnion and Ramp ( By Sara García)
