03: D´Alembert´s principle and Lagranges eq
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Jacob Linder: Lecture 2, 11.01.2012, Klassisk Mekanikk (TFY 4345) v2012 NTNU
A full textbook covering the material in the lectures in detail can be downloaded for free here:
http://bookboon.com/en/introduction-to-lagrangian-hamiltonian-mechanics-ebook