The Physics 2 Tutor: Learning by Example DVD series covers thermodynamics, oscillations & waves in physics through step-by-step example problems. Emphasis is placed on giving students confidence in their skills by gradual repetition so that the skills learned are committed to long term memory. Lessons cover superposition and interference of waves, including how two or more waves can interact by adding the amplitudes of the waves together. Grades 9-12. 54 minutes on DVD.