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Pages+from+Chapter+1 - 24 Chap ter 1 App lying Models to...

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24 Chapter 1 Applying Models to Thermal Phenomena General Process of Constructing an Energy-System Diagram Listed here are some general questions you need to ask yourself as you use the Energy-Interaction Model. The order suggested is logical, but it is often necessary to cycle back to previous questions . The energy-system diagram is a tool to help you use the Energy-Interaction Model. The energy-system diagram helps you keep track of the many important details you need as you construct the particular model corresponding to the particular physical situation you are interested in. 1) What happened? State the essence of the physical phenomenon of interest in your own words . You don’t need to write this down, but you should have an “internal dialogue” with yourself. 2) What is the boundary of the physical system you are modeling? Answer this question by listing the physical things you intend to include in the physical system. (Examples of “physical things” are: air, H 2 O, hand, heatpack, “all of the chemicals”.) Energy systems are always energy systems of particular physical things, so the energy systems you identify (in step (4)) will depend on the physical things you decide to include within the boundaries of your overall physical system . In some cases, it might be useful to identify two or more separate physical systems, each with its own energy-system diagram. 3) What is the extent of the process or interaction? This means identifying the
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This note was uploaded on 03/27/2011 for the course PHY 7A taught by Professor Pardini during the Winter '08 term at UC Davis.

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Pages+from+Chapter+1 - 24 Chap ter 1 App lying Models to...

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