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PHYSICS 002C Lecture 02A

PHYSICS 002C Lecture 02A - PHYSICS 002C Syllabus Changes 1...

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PHYSICS 002C Lecture 02 April 01, 2009 Serway and Jewett Chapter 12 – Oscillatory Motion Syllabus Changes 1 h Midterm exam May 1 The Physics 3 h Final exam Grades Review: How to solve physics problems – Chap 1 sect 10 p 22: Models, Representations, Strategies. Our representation of the physical world. Hooke balance wheel Behind these notions are the two postulates: of time and space Chap 12.1,2 Motion of a particle on a spring: Hooke’s law: kx F s - = DEMO: Spring with weights. Q: Quadrupling the mass: a) doubles the frequency, b) doubles the period, c) halves the period, d) quadruples the amplitude; e) breaks the spring. Q: Why is Hooke’s law true for small displacements? a) atoms move without friction, b) atomic forces are smooth, c) everything is linear, d) Newton’s law of universal cavitation; e) Hooke used a microscope. Combine Hooke’s law and Newton’s 2 nd law to get x dt x d 2 2 2 / ϖ - = , where m k / 2 = ϖ Solution: ) cos( φ ϖ + = t A x velocity: ) sin( / φ ϖ ϖ + - = = t A dt dx v The Framework
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