Org 2 is just more reactions, stuff involving carbonyls and carb acids that you probably didn't learn about in Org I. With a solid foundation in Org 1, you should be able to learn the basic patterns of these with a review book which will explain the trends. With the Orgs, I think that Org 1 isn't more important per se, but it's more important to understand the fundamentals because that'll carry you through the rest of the reactions.
With physics it's a little different because physics 1 is mostly intuitive and you'll be dealing a lot with kinematics, momentum/collisions, torque, energy conservation, and fluids. You might even know some of this from gen chem. Probably some angular momentum but I have yet to see anything about that on the mcat and I don't even know if it's listed on the official topics. Physics 2 is a lot more difficult in terms of content and you're dealing with complex things like magnetic fields and electric fields and particle accelerators and stuff. With Physics 1, you're kinda following a recipe and, most of the time, questions require a basic understanding and knowledge of a few of the same formulas. Physics 2 requires a deeper understanding.
All of the classes are important in their own ways but, in terms of difficulty (and also frequency on the mcat since they're clearly going to test difficult stuff a lot), physics 2 is more "important." Org 1 paves way for Org 2 and, from what I've seen, questions come with almost equal frequency from both of those.
