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 heat engines and the second law of thermodynamics in physics, including how useful work can be done by engines which use expansion or hot gases to move a piston. Grades 9-12. 69 minutes on DVD.