Lect14 - PHYS 172 Modern Mechanics Lecture 14 Friction...

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Fall 2011 PHYS 172: Modern Mechanics Lecture 14 – Friction, Driven Oscillations, and Resonance Read 7.10 – 7.12 1
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NO ANIMALS WERE HARMED IN THE MAKING OF THIS FILM EXCEPT FOR THAT REPORTER'S POOR LITTLE DOGGIE 3
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Announcements EVENING EXAM TONIGHT 8-9 pm in Elliott Hall 7 multiple choice questions + 1 hand-graded Material: Through section 7.9 in the book Equation Sheet will be provided Final Exam Dec. 14, Elliott Hall 8:00 – 10:00 AM. Excused absences will not be granted for the Final Examination. (See the syllabus) 4
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Today ` s Lecture • Friction and Energy Dissipation • Driven Oscillations and Resonance 5
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A small metal ball will fall as if gravity is the only force, F=mg. A falling coffee filter does not obey F=mg. Instead it reaches a nearly constant terminal velocity: Air Resistance 6
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7 Terminal speed m ! g ! F air d ! p dt = ! 0 ! v = const " ! """" terminal speed 7
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mg F air F air Observations about air resistance: 1. F air is proportional to speed.
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This note was uploaded on 12/07/2011 for the course PHYS 172 taught by Professor ? during the Fall '08 term at Purdue.

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Lect14 - PHYS 172 Modern Mechanics Lecture 14 Friction...

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