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Background information for simple machines—Ca...
http://www.sciencetech.technomuses.ca/english...

Inventor's Toolbox: The Elements of Machines
http://www.mos.org/sln/Leonardo/InventorsToolbox.htm...

The Franklin Institute Online—Simple Machines
http://www.fi.edu/qa97/spotlight3/spotlight3.html

How to catapult a castle : machines that brought down the battlements
Author: De Winter, James.
ISBN: 9781429631181
Copyright: 2009
Summary: Presents the science behind building and defending castles including the use of simple machines, such as pulleys and levers.

Move it! Work it! : a song about simple machines
Author: Salas, Laura Purdie.
ISBN: 9781404852990
Copyright: 2009
Summary: Introduces the topic of simple machines through the familiar tune 'Kookaburra'.

Inclined planes to the rescue
Author: Thales, Sharon.
ISBN: 073686752X
Copyright: 2007
Summary: Describes inclined planes, including what they are, how they work, and common uses of these simple machines today. Includes an activity.

Levers to the rescue
Author: Thales, Sharon.
ISBN: 0736867473
Copyright: 2007
Summary: Describes levers, including what they are, how they work, past uses, and common uses of these simple machines today. Includes an activity.

Pulleys to the rescue
Author: Thales, Sharon.
ISBN: 0736867481
Copyright: 2007
Summary: Describes pulleys, including what they are, how they work, past uses, and common uses of these simple machines today. Includes an activity.