Chapter15

# Chapter15 - Chapter 15: Oscillations and Waves Demos:

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PHYS276, S09 Chapter 15 1 Chapter 15: Oscillations and Waves Demos: http://www.physics.umd.edu/deptinfo/facilities/lecdem/lecdem.htm G1-01 examples of shm G1-52: stringless pendulum G1-11: comparison of shm and ucm G1-14: pendula with different masses G1-15: pendula with 4 to 1 length ratio G1-42: torsional pendulum H3-61: beaker breaker Thanks to Prof LaPorta and “Peer Instruction” by Eric Mazur

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Intro to Waves PHYS276, S09 Chapter 15 2 So far, when modeling physical phenomena, we have considered objects are “particles” or as being constructed from “particles”. However, many physical phenomena instead are examples of oscillations and/ or waves. • oscillating spring • pendulum • water waves • sound waves • light • quantum mechanics NASA
SHM PHYS276, S09 Chapter 15 3 Do g1-01: examples of shm, g1-52: stringless pendulum First, we’ll consider “Simple Harmonic Motion”. The most basic example is the oscillations of a spring that is stretched or compressed, then released. • why/when SHM occurs • equations to describe it • relation between SHM and motion in a circle with constant velocity We’ll then move on and see how the mathematics/language is related to wave motion. All of these motions have a “restoring” force. What is the restoring force for each?

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PHYS276, S09 Chapter 15 4 Stretch/compress the spring an amount x. Release from rest. After you let go, the only force on the block is that due to the spring. Let’s show that the position is
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Chapter15 - Chapter 15: Oscillations and Waves Demos:

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