Voir les mots dérivés de machines.
This is a series of experiments about simple machines: levers, wheels and inclined planes. This unit was designed for use in the third grade. ...
http://www.galaxy.net/~k12/machines/
An overview of the six basic types of simple machines with pictures and student drawings.
http://www.coe.uh.edu/archive/science/science_lessons/scienceles1/finalhome.htm
Games challenge you to identify different types of simple machines.
http://www.edheads.org/activities/simple-Machines/
Thus, Ug and Home Lee invented the first simple machine. Throughout the centuries, humans have been challenged to make life easier. ...
http://www.usoe.k12.ut.us/curr/Science/sciber00/8th/Machines/sciber/intro.htm
Some simple machines, explained, described and illustrated.
http://www.mos.org/sln/Leonardo/inventorsToolbox.html