Balance of Energy — Lesson 1

This video lesson starts with the definition of power expended by external forces on a body. Using the Cauchy and Gauss Divergence theorems, a volumetric integral expression for the external power is developed. The expression is further manipulated, and other theorems applied, such as the Reynolds transport theorem, to the end of deriving a reduced form of the first law of thermodynamics.

Answers to Frequently Asked Questions:

In this video we will answer the following question:

  • Would the discontinuity in boundary conditions defined in this lesson affect the displacement?

  • What are the technical conditions mentioned related to the balance of energy?