John R. Taylor's Classical Mechanics is widely considered one of the most accessible and comprehensive textbooks for undergraduate physics students. It provides a bridge between basic introductory courses and more advanced theoretical physics. Amazon.com Accessing the Text
If you are serious about mastering physics, this is the resource you need. While finding a PDF offers convenience, the clarity and depth of Taylor’s writing make it a volume worth investing in for the long haul of a physics career.
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: You can borrow or view a high-resolution scan of the book on Archive.org
Simplifying constraints in mechanical systems.