Concepts of Physics
Chapters 25 & 26
Other Chapters
Color Key
Black: In Class
Green: Due/Test
Red: Homework
Blue: Related links
Updated 5.4.2008
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Friday, April 11
- Heat & Temperature Test
- Read Chapters 25 & 26
Monday, April 14
- Linear Expansion of Metals Lab due
- Introduction to waves - rhythmic disturbances that carry energy through matter or space
- Brainstorm: what travels as a wave?
- Difference between mechanical & electromagnetic waves (show spectrum chart).
- Intro. to Pendulum lab
Tuesday, April 15
Wednesday, April 16
Thursday, April 17 and Friday, April 18 – No school – Teacher Professional Development Day
Monday, April 21
- Simple harmonic motion - repetitive, regular motion with a measurable period
- Period - time to complete one cycle (measured in seconds)
- Frequency - number of occurances or cycles in an amount of time. Usually measured in Hertz (Hz) and is the number of cycles per second. Also know about kHz, MHz, GHz, etc.
- What does the period of a pendulum depend on?
- Simple harmonic motion
- Wave parts – crest, trough, wave pulse
- Measuring waves – wavelength (m), amplitude, frequency (Hz), period, energy (J), speed of waves
- Traveling waves vs. standing waves (nodes & antinodes)
- Bow waves & shockwaves
- Wave pulse, continuous wave, surface wave,
- Types of waves – S waves (transverse), P waves (longitudinal)
- Compression and rarefaction
Tuesday, April 22
- Wave calculations (wavelength, frequency, period, speed)
- Interference during superposition – Constructive and destructive (with slinky)
Wednesday, April 23
- P. 388, 21-27 due today
- Intro. to speed of sound lab
- Stroboscope demo
Thursday, April 24
- Pendulum lab due
- Speed of sound lab
- Sound is a longitudinal traveling wave, usually in air. Speed of sound in air is 331 m/s and increases by 0.6 m/s for every 1°C.
- Video: ESPN Doppler Effect
- Doppler effect (apparent shift in frequency with changes in velocity)
- Doppler radar, dopper effect DVD demonstration, red/blue shift in stars (Hubble constant) Hubble images | a Doppler physlet | Hubble constant graphs
- Sonar in bats, some radar guns
- applications of the doppler effect - star distances, speed enforcement, weather radar
- Speed of sound vs. speed of light
- How long does it take for sound and light to travel to you when lightning strikes 10 km (6.2 mi) away?
- Speed of Sound Lab due
- Finish Doppler Effect info. (do dvd demo)
- Singing rod demos
- bell in a vacuum jar (matter waves require matter)
- Interference & noise cancellation (BOSE noise cancelling headsets)
- DVD Demos: Disc 9; #9–19, 24–30
- Timbre: Vernier microphone - show different waveforms for
Tuesday, April 29 – No class due to PSSA testing –12th graders report to E–Large
Wednesday, April 30 – 2nd period after 5th/lunch today due to PSSAs
- P. 388, 36–39 due today
- Go over problems in class
- Range of hearing with sound generator and speakers
- Work on study guide
Thursday, May 1
- Video: ESPN How Sweet it is
- 1st period - infrasonic, ultrasonic
- Sound level meter and the decibel scale
- P. 394 table of loudnesses
- orange & green swinging pipe thingy (five tones - do with Vernier microphone)
- Bats: size of sweet spot on Al vs. wood bats, ease of hitting with bat types
Friday, May 2
- Waves and Sound Study Guide due
- Go over study guide; more DVD demonstrations
- Next time questions
Monday, May 5
- Waves and Sound Test
- Read Chapter 26
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