p111_lecture12

# P111_lecture12 - Chapter 6 Work and Energy 6.4 Conservative Versus Nonconservative Forces DEFINITION OF A CONSERVATIVE FORCE Version 1 A force is

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Chapter 6 Work and Energy

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6.4 Conservative Versus Nonconservative Forces DEFINITION OF A CONSERVATIVE FORCE Version 1 A force is conservative when the work it does on a moving object is independent of the path between the object’s initial and final positions. Version 2 A force is conservative when it does no work on an object moving around a closed path, starting and finishing at the same point.
6.4 Conservative Versus Nonconservative Forces

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6.4 Conservative Versus Nonconservative Forces Version 1 A force is conservative when the work it does on a moving object is independent of the path between the object’s initial and final positions. ( ) f o h h mg W ! = gravity
6.4 Conservative Versus Nonconservative Forces Version 2 A force is conservative when it does no work on an object moving around a closed path, starting and finishing at the same point. f o h h = ( ) f o h h mg W ! = gravity W gravity = 0

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Conservative Versus Nonconservative Forces An example of a nonconservative force is the kinetic frictional force. ( ) s f s f s F W k k ! = = = o 180 cos cos " The work done by the kinetic frictional force is always negative. Thus, it is impossible for the work it does on an object that moves around a closed path to be zero. The concept of potential energy is not defined for a
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## This note was uploaded on 06/03/2011 for the course PHY 111 taught by Professor Bolland during the Fall '10 term at Ohio State.

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P111_lecture12 - Chapter 6 Work and Energy 6.4 Conservative Versus Nonconservative Forces DEFINITION OF A CONSERVATIVE FORCE Version 1 A force is

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