Merriam-Webster Online <http://www.m-w.com/cgi-bin/dictionary>
Atomic Bonds <http://www.vendian.org/envelope/dir0/bond.html>
Arctic Reigonal Supercomputing Center. <http://www.arsc.edu> (molecule image)
Serway Jewett, "Physics For Scientists and Engineers" , Thomson Brooks/cole. p 464

Links:
Advanced character physics
Open Dynamics Engine -- for those who want to use already written code to simulate Physics
Rigid Body Simulation Tutorial --an exaustive tutorial on physics simulation.
My Physics Lab - Rigid Body Collisions -- a java web-based physics simulation
http://scienceworld.wolfram.com/physics/RigidBody.html -- a definition for rigid body physics.

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