Strong shapes
http://www.howstuffworks.com/bridge.htm
How bridges work: An in depth
look at how forces are used in the design and construction
of various types of bridge.
Gravity
http://www.howstuffworks.com/question232.htm
How does gravity work?: A good
treatment of a complex question. Well worth the read!
Upthrust and ballooning
http://www.omsi.edu/explore/physics/air/science/glossary.html
Air Travelers: [sic.] A good
site dedicated to the science behind hot air ballooning. Includes
a range of activities and teachers notes.
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