Chapter 13: Electrical Systems
Chapter 18: Harmonic Motion
|
Demonstrating What Changes the Period of Simple Harmonic Motion
This Flipping Physics video has some nice demonstrations and explanations. Equations beyond what we will use in Conceptual Physics are introduced. Here's a link to another video from the same series, explaining why a pendulum is not in simple harmonic motion at amplitudes above 15 degrees. (It's still in harmonic motion, just not in simple harmonic motion.) Waves: Phase Difference
This video explains phase differences between graphs of waves. Pay attention to his explanations of degrees, but try to ignore what he says about angles measured in radians. (Radians are another unit for measuring angles. 360 degrees = 2 pi radians.) |
|
Resonance Introduction Using Nine Demonstrations
We will watch the first 7.5 minutes of this Flipping Physics video in class. |
Chapter 19: Waves
|
Intro to Waves
This is a three-minute introduction, including a comparison of transverse and longitudinal waves. Resonance and the Sounds of Music
MIT professor Walter Lewin delivers an entertaining physics lecture full of demonstrations. Standing Wave Harmonics
This demonstration uses a metronome to help you see how the harmonics are set up in a rope. |
Chapter 20: Sound
The videos for Chapter 19 are closely related. If you have not already watched Resonance and the Sounds of Music, I encourage you to do so. It's long but interesting!
Online Frequency Generator
This site will play a tone of any frequency you specify up to 22,000 Hz. The speakers on your device may limit the frequencies somewhat. Be ready to stop the sound if it is too loud, and be especially careful if you are using headphones! (This is the site we used in class to test our hearing. It's not a true hearing test, but it is a way to learn what different frequencies sound like.) Frequency Sound Generator App Cell phone apps are available to generate the frequency you specify. I used Frequency Sound Generator, an android app from LuxDeLux, so that we could hear two notes at the same time--one on my phone and the other on my computer--and listen to the beats produced by nearby frequencies. Decibel Meter App Cell phone apps can turn your phone into a decibel meter! I have been using Sound Meter, a free app from Splend Apps, to measure the loudness of my house, voice, appliances, and church service this week. My dog barks at 90 to 100 decibels! Frequency Meter Apps Cell phone apps can also show you the frequencies of sounds, including multiple frequencies at the same time. I have been using Spectroid (an app from Carl Reinke) and Oscilloscope (an app from Sound-Base Audio, LLC) to investigate frequencies of items in my environment. |
Textbook Error!
Page 471 of our textbook has an error in the paragraph about "The sensitivity of the ear." The second-to-last sentence should read: "Sounds near 2,000 Hz seem more loud than sounds of other frequencies, even at the same decibel level." |
Chapter 21: Light and Color
Chapter 22: Optics
The topic of Optics is closely related to Chapter 21 (Light and Color). If you want a review of some foundational ideas about light, look above for "What is Light?" by Professor Dave.
|
|
Specular vs. Diffuse Reflection
For another explanation of specular and diffuse reflection, check out The Physics Classroom's written explanation and/or their video about the same topic. |
|