Refreshing take on the subject. He derives all of freshman and sophomore physics from scratch and uses very intuitive arguments to do so. The math prerequisite isn't that much either: calculus, elementary linear algebra, and elementary differential equations. One thing I might add is this would be a very difficult first exposure without the help of a professor. There are some parts that seem a little too wordy at times and others that seem as though he is showing off at how little you need to arrive at a fundamental result. Don't be fooled, this isn't Feynman's first rodeo. Overall a great series of lectures. Bravo prof feynman