And while on that subject, you can check out: Structure and Interpretation of Classical Mechanics http://mitpress.mit.edu/sicm/book.html http://mitpress.mit.edu

And while on that subject, you can check out: Structure and Interpretation of Classical Mechanics http://mitpress.mit.edu/sicm/book.html http://mitpress.mit.edu/sicm/book.html [ A complete course on Lagrangian mechanics (the stuff you need to solve mechanics problems more complicated that the simple types of motion covered by Newtonian mechanics), with each equations are actionable.] http://mitpress.mit.edu/sicm/book-Z-H-11.html http://mitpress.mit.edu/sicm/book-Z-H-11.html