Department of Physics and Astronomy
Michigan State University
PHY231 Fall 1997

Lecture 20: October 15

Reading before class: C/J 10.4, 10.6, 10.7, 10.8

Topics and Concepts

• Reference circle for understanding simple harmonic motion
• Pendulum
• Damped harmonic motion
• Resonance

Equations

• x = a cos theta = a cos omega t
• v = -a omega sin theta
• a = -aw^2 cos theta
• omega = 2 pi/T = 2 pi f = sqrt(k/m) [spring]
• omega = mgL/I = sqrt(g/L) [pendulum]

Examples

• Non-simple harmonic motion (C/J example 7, page 291)
• Keeping time (C/J example 13, page 299)

Handouts

• Homework 7

Reading for next class: C/J 11.1-11.4

PHY 231

This document http://www.pa.msu.edu/courses/1997fall/PHY231/lect20.html was last updated on 20 August 1997 by Thomas Glasmacher