college physics

This semester i'm retaking this college level introductory physics course. So far it's going great! I love the teacher with his enthusiasm and his sense of humor.His colleague who filled in for him in the last lecture, says about him: " He's a good teacher, and he actually gives a crap".That pretty much explains it. We're using a textbook by Giancoli, 6th edition. So the first chapter is about how they do science,and contents like scientific method(observation,theory,model,law,principle etc), standard units (SI unit),precision VS accuracy, percent error, significant figure, order-of-magnitude estimation, dimensions. On the very first day of class, the statement that i really liked, so far ignited my interest in the course was " Law in human world is prescriptive, but law in science is descriptive", which means legal law tells people how they SHOULD behave, but scientific law tries to tell how nature DOES behave. Theory is being tested over and over again, the most important feature of theory is actually testable. Law is a statement which holds to be valid over a wide range of observed phenomena, whereas principle applies to statements less general( ex: Archimed's Principle).Main SI units are m-kg-s. Accuracy (Did you hit the target?) Precision (How close did you hit the target?) :)
The concept of significant figure is little fuzzy though it'll get better once i start solving problems. Order of magnitude simply means ten to the power something (i.e, 10^-5). Dimensional analysis will help you make sure you got the correct answer by checking the unit combination.
That's it for the first two lectures. Also there's going to be a web project due at the end of the semester. The topic can be anything physics related, even a biography of any notable physicist.