PHY7A Lecture2

PHY7A Lecture2 - Various Types of Energy (to be discussed...

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Various Types of Energy (to be discussed this quarter) Some general terms for energies of macroscopic (large) objects 1. Internal energy (energies of the atoms making up the object) A. Thermal energy - the part of the internal energy of an object that increases as the temperature increases (i.e. energy of the “random motion” of all the molecules inside an object) B. Bond Energy - the part of the internal energy of an object that is left after the thermal energy is subtracted out C. Nuclear Energy - maybe talk about this later (really another type of bond energy)
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Some new types of energy systems to be discussed later today 2. Mechanical energies (energies of the entire object as a single unit) A. Kinetic energy - energy of motion of a single object B. Gravitational potential energy - energy that depends on the positions of two objects (usually the earth and some other object) C. Spring potential energy (really a kind of bond energy, the bonds bend but don’t break) - energy that depends on the positions of the two ends of a spring
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General method for energy conservation problems. 1) When you analyze a particular physical problem consisting of two interacting systems, you should begin by examining how the physical systems are changing and then use what you learn to decide which energies might be important in the problem. Possible changes: Change in physical system Energy system that is changing Temperature changes Thermal energy system Phase or chemical changes Bond energy system Speed of object changes Kinetic energy system
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This note was uploaded on 10/22/2010 for the course PHY 7A 56192 taught by Professor ? during the Summer '09 term at UC Davis.

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PHY7A Lecture2 - Various Types of Energy (to be discussed...

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