Professor Susskind begins the final lecture with a review and comparison of the three different concepts of momentum: mechanical momentum from Newtonian mechanics, canonical momentum from the Lagrangian formulation of mechanics, and momentum that is conserved by symmetry under translation invariance from Noether's theorem. He then develops the connection between Lagrangian and Hamiltonian mechanics and field theory in more detail than in previous lectures.

Professor Susskind moves on to develop the concepts of energy and momentum density, and then applies these concepts to electromagnetic fields. He concludes the course with an introduction to energy and momentum flux, and the stress-energy tensor.

Topics: Comparison of the three concepts of momentum; Connection between classical mechanics and field theory; Energy and momentum density; Stress-energy tensor.

1. The Lorentz Transform
2. Adding Velocities
3. Relativistic Laws of Motion and E = mc2
4. Classical Field Theory
5. Particles and Fields
6. The Lorentz Force Law
7. The Fundamental Principles of Physical Laws
8. Maxwell's Equations
9. Lagrangian for Maxwell's Equations
10. Connection Between Classical Mechanics and Field Theory

In 1905, while only twenty-six years old, Albert Einstein published "On the Electrodynamics of Moving Bodies" and effectively extended classical laws of relativity to all laws of physics, even electrodynamics. In this course, we will take a close look at the special theory of relativity and also at classical field theory. Concepts addressed here will include four-dimensional space-time, electromagnetic fields, and Maxwell's equations.