Apologies if this question has already been asked but a quick google search as well as a PF - specific search didn't yield anything. So, I am currently going through University Physics (Freedman, Young , Sears Zhemansky) before junior year starts and I was wondering if I have to solve all the problems in the exercises. There are about a 100 problems per chapter (on average) with around half of them as miscellaneous and the other half is section-specific. I did that once and it put me off Physics for quite some time. Ideally, I'd look through a problem just to see if I could do it and then skip it. But sometimes it happens that the problem looks really obvious but am unable to find a solution. So, is it necessary to solve all the problems? And if not , what is the criteria to skip a problem? Thank you.