Lagrangian and Hamiltonian Mechanics

Lagrangians and Hamiltonians for High School Students
A discussion of Lagrangian and Hamiltonian dynamics is presented at a level which should be suitable for advanced high school students.
http://arxiv.org/abs/physics/0004029

The Principle of Least Action
A brief review of the mathematics and physics involved in the principle of least action.
http://www.ph.utexas.edu/~gleeson/httb/chapter1_3_6.html

The Principle of Least Action
An overview of the historical development of the principle of least action.
http://ourworld.compuserve.com/homepages/cuius/idle/evolution/ref/leastact.html