Hello, Since I cannot post this in the "Learning Materials" forum, I thought I'll just post it here. I am a first year Physics/Biology major, and I am currently studying a course in classical mechanics. My problem is that I do not seem to find high level problems in mechanics anywhere online, or in books. I've tried doing MIT problem sets from their OCW website, but most of it, compared to our problems/tests are not very hard. I've also tried solving problems from Kleppner & Kolenkow's Introduction to Mechanics (The book recommended in our syllabus), but that, too, wasn't difficult. Does anyone know where I could find some difficult problems to tackle? Thanks!