My physics teacher doesn't know how to teach anything. Even the most basic concepts. This results in everybody in the class becoming frustrated because we all have to teach ourselves and half of us are failing. Like, to explain when an object swings in a pendulum motion that it has the same amount of kinetic energy mid-swing as potential energy at the far ends of it's motion, he must go on for about 30 minutes of blathering. So I'm attempting this stuff right now and it sucks.