Fantasic broad ranged interactive fun site covering stress and strains in common systems. 

http://web.mst.edu/~mecmovie/

Useful animations of simple mechanical systems.

http://www.brockeng.com/mechanism/

Great interactve online labs explaining momentum and impulse.

http://www.sciencejoywagon.com/physicszone/06momentum/

Mechanics quiz and other useful physics information

http://www.mcwdn.org/Physics/MechanicsQuiz.html

Quiz on a broad range of topics in mechanics. 

http://www.upscale.utoronto.ca/PHY138Y/Mechanics.2003-2004/QuizResults/index.html

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