Perhaps I am not reading the chapters enough, but this is just intro to physics where there aren't even any math equations to compute. It is simply the concepts and nature of things like light, heat, phase change, etc. The final exam which is in a few weeks covers everything from day 1, it's cumulative. I've been reading the chapters again however it is a thick book. I have been reading thoroughly so should I Just keep reading or am I just too slow to understand physics? I have a keen interest in it and want to understand For example, I attended the lecture on magnetism and electromagnetic induction, and to sum it up I could say that magnetism is emitted by charges in motion, which is electrical current. When there is a change in the magnetic field, electromagnetic induction occurs, and an electrical current is produced. The two are bound together. Right now I am reading about light, and I can say that the reason why light travels at the speed it does is because of the conservation of energy. If it traveled any slower the wave would die out.