For first-semester students studying classical mechanics, several recommended problem books emphasize challenging problems that require more than just formula memorization. "3000 Solved Problems in Physics" is suggested as a suitable alternative to the Goldstein book. Another strong recommendation is "Classical Mechanics with Problems and Solutions" by Morin, which is noted for its effectiveness in providing a solid understanding of the subject. Additionally, "Classical Dynamics: A Contemporary Approach" by José and Saletan is mentioned for its challenging problems and clear exposition. For those comfortable with advanced concepts, "Mathematical Methods of Classical Mechanics" is also suggested, though it may not focus on problem-solving as much. Overall, Morin's book is highlighted as particularly beneficial for beginning undergraduates.
