Is temperature a discrete or continuous variable? What are the three properties of air? These are common physics questions that the professor likes to ask. Not many students love physics, it really seems like a rather boring process, because in order to get excellent grades in college you need to know the formulas by heart.
Recently I came across a site where physics questions and answers are collected, and to my surprise, I found almost all the answers on my homework. But most of all I liked the fact that all the material is presented in an easy form, where you do not need to spend a lot of time to remember the information.