Classical Theory and Atomistics -- Atomistic Models -- Atomistic Locking and Friction -- Atomistic Origin of Friction -- Superlubricity -- Atomistic Simulation of Friction -- Experimental Approach for Atomic Level Friction -- Summary -- Physical Preliminaries -- Mathematical Supplement -- Data Analysis -- Crystal Structure -- The SI (mks) Unit System -- Practice for Verlet Algorithm -- Program Example of Molecular Dynamics for Atomistic Model -- Table of Values -- Table of Relative Atomic Weights -- References -- Afterword.