Khan Academy. Circuits (part 3) Circuits (part 2) Circuits (part 1) Magnetism 6: Magnetic field due to current. Intro to springs and Hooke's Law. Work/Energy problem with Friction. Introduction to work and energy. Center of Mass. Moments (part 2) Moments. Newton's Second Law of Motion. Newton's First Law of Motion. Introduction to Vectors and Scalars. Newton's Third Law of Motion. Conservation of Energy. Work and Energy (part 2)