I am currently in calculus based undergraduate physics. I have questions that I can't seem to find answers to in my textbook. Can anyone suggest a really good book about the nature of conservative fields (gravity, electrostatic, etc) and the related math? I'm already done with the vector calculus sequence, so some heavy math isn't too scary. It seems that the vector calc sequence only ever did completely theoretical problems. The physics book doesn't go into much detail at all with the math.