ch7 - Chapter 7 Potential Energy Potential Energy Potential...

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Chapter 7 Potential Energy
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Potential Energy Potential energy is the energy associated with the configuration of a system of objects that exert forces on each other The forces are internal to the system
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Types of Potential Energy There are many forms of potential energy, including: Gravitational Electromagnetic Chemical Nuclear One form of energy in a system can be converted into another
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System Example This system consists of Earth and a book Do work on the system by lifting the book through D y The work done is mgy b - mgy a
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Potential Energy The energy storage mechanism is called potential energy A potential energy can only be associated with specific types of forces Potential energy is always associated with a system of two or more interacting objects
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Gravitational Potential Energy Gravitational Potential Energy is associated with an object at a given distance above Earth’s surface Assume the object is in equilibrium and moving at constant velocity The work done on the object is done by and the upward displacement is
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Gravitational Potential Energy, cont The quantity mgy is identified as the gravitational potential energy, U g U g = mgy Units are joules (J)
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Gravitational Potential Energy, final The gravitational potential energy depends only on the vertical height of the object above Earth’s surface In solving problems, you must choose a reference configuration for which the gravitational potential energy is set equal to some reference value, normally zero The choice is arbitrary because you normally need the difference in potential energy, which is independent of the choice of reference configuration
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Conservation of Mechanical Energy The mechanical energy of a system is the algebraic sum of the kinetic and potential energies in the system E mech = K + U g The statement of Conservation of Mechanical
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This note was uploaded on 04/02/2010 for the course PHYSICS 6A taught by Professor Koskeshian during the Spring '10 term at UCLA.

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ch7 - Chapter 7 Potential Energy Potential Energy Potential...

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