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Chapter 5, Section 2

Chapter 5, Section 2. Making Waves. February 17, 2012 HW: PTG #1, 2, 5-8, pg. 505-506, Due Next Wednesday/Thursday. Learning Objective: Describe how waves carry energy Describe how wavelength, frequency and speed of a wave are related Success Criteria: Observe the motion of a pulse

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Chapter 5, Section 2

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  1. Chapter 5, Section 2 Making Waves

  2. February 17, 2012HW: PTG #1, 2, 5-8, pg. 505-506, Due Next Wednesday/Thursday • Learning Objective: • Describe how waves carry energy • Describe how wavelength, frequency and speed of a wave are related • Success Criteria: • Observe the motion of a pulse • Calculate the speed of a wave pulse • Observe standing waves • Investigate the relationship among wave speed, wavelength, and frequency • Make a model of wave motion • Distinguish between transverse and longitudinal waves • Do Now: • Write LO and SC on a new left-side page • WDYS/WDYT pg. 492

  3. Investigate: Part A • Stadium Wave • Standing Wave • #1-Answer a-d in your notebook

  4. Do Now • Draw a wave • Label as many parts as you can of the wave. • Read page 494 #4, 5, 6, 7

  5. Part A Big Idea? • Wave moves, but people move up and down • Waves are produced by adjacent particles move up and down, causing the wave to move across.

  6. Investigate: Part B • Transverse Waves • Demo #1-2 (answer questions) demo 3-4 answer question • You are writing in your notebook • #6-7-in groups • #7-choose amplitude as a class • Prediction: How do you think amplitude will affect the speed of the wave? • Groups 1-2, 3-4, 5-6 different amplitudes

  7. Exit ticket • ON a half sheet of paper… • Describe how waves carry energy using the following sentence structure about how waves carry energy. • As particles move___________, the wave moves___________.

  8. February 23, 2012 • Learning Objective: • Describe how waves carry energy • Describe how wavelength, frequency and speed of a wave are related • Success Criteria: • Observe the motion of a pulse • Calculate the speed of a wave pulse • Observe standing waves • Investigate the relationship among wave speed, wavelength, and frequency • Make a model of wave motion • Distinguish between transverse and longitudinal waves • Do Now: • Read procedures #10-15 • Pg. 496-497 • Create data table

  9. #10-13 Demo then in groups • #14-Demo, discuss energy • #15-groups, discuss • A transverse pulse is one in which the motion of the wave is perpendicular (90 degrees) to the motion of the particles of the medium • As the amplitude of a transverse pulse on a spring increases, its speed remains the same • As the frequency of a standing wave increases, the wavelength decreases and the wave velocity remains the same.

  10. February 22, 2012HW: PTG #1, 2, 5-8, pg. 505-506, Due Wed, Bring Tissues • Learning Objective: • Describe how waves carry energy • Describe how wavelength, frequency and speed of a wave are related • Success Criteria: • Observe the motion of a pulse • Calculate the speed of a wave pulse • Observe standing waves • Investigate the relationship among wave speed, wavelength, and frequency • Make a model of wave motion • Distinguish between transverse and longitudinal waves • Do Now: • LO and SC reflection • Go through what we have covered so far and write page #s next to each item • How do you know you have met this success criteria or learning objective? On left side page

  11. Part B Big Ideas • Speed of a wave=distance/time • Speed=frequency x wavelength • Frequency=#times the wave moves up and down each second • Energy travels in waves • Transverse Wave: • Standing Wave:

  12. Investigate: Part C • Longitudinal Waves • Complete all sections, OK with teacher

  13. Part C Big Ideas • Compressional/Longitudinal Waves

  14. Physics Talk • Waves Transfer Energy • Example • A wave transfers energy with no transfer of mass • When you throw a ball the mass and kinetic energy move from one place to another • A wave transfers only energy, no mass is moving.

  15. Physics Talk • How is energy transferred? • Chemical energy in musclesmechanical energy in armkinetic energy in spring • Energy transferred from one form to another, but TOTAL energy remains the same…Conservation of Energy!

  16. Physics Talk • How do waves “add”? • They continue to travel as though the other wave never existed. • http://www.youtube.com/watch?v=Xqo6sEt1cUE

  17. Physics Talk • Periodic Wave • Crest • Trough • Amplitude • Repetitive series of pulses • Highest point on a periodic wave • Lowest point on a periodic wave • Height of crest or depth of trough

  18. Physics Talk • How does amplitude relate to sound? • How does amplitude relate to energy? • Large amplitudeLoud sound! • Small amplitudesoft sound • Large amplitudeLarge amount of energy • Small amplitudesmall amount of energy

  19. Wavelength (λ) • Frequency (f) • Distance between two consecutive crests or troughs • Symbol is λ (pronounce lambda) • Number of waves per unit time • Usually waves/sec called hertz (Hz)

  20. Physics Talk • Period (T) • Time required to complete one complete wave (crest-trough-crest) • Period and frequency are inversely proportionate • T=1/f • f=1/T

  21. Physics Talk • Transverse Waves • Compressional (Longitudinal) Wave • The medium moves perpendicular to the direction of the wave • The medium moves parallel to the direction of the wave • http://www.youtube.com/watch?v=MoVz2ENJb8M

  22. Physics Talk • Standing Wave • Wave pattern that remains in a constant position. • Does not go right/left, but does go up/down. • http://www.youtube.com/watch?v=03cUrkjqdE0

  23. Node • Antinode • Place on a standing wave that is motionless • Point on a standing wave where the displacement (movement) is greatest

  24. What type of wave is sound? • Compression Wave • Air molecules get compressed and move through the air

  25. How can you calculate the speed of a wave? • Speed=Distance/Time • Wave speed=wave frequency x wavelength v=fλ Sample problems on pg. 502

  26. Learning Objective: • Describe how waves carry energy • Describe how wavelength, frequency and speed of a wave are related • Success Criteria: • Observe the motion of a pulse • Calculate the speed of a wave pulse • Observe standing waves • Investigate the relationship among wave speed, wavelength, and frequency • Make a model of wave motion • Distinguish between transverse and longitudinal waves • Do Now: • Finish LO and SC reflection • Go through what we have covered so far and write page #s next to each item • How do you know you have met this success criteria or learning objective? On left side page • Essential Questions Pg. 504 • What does it mean? • How do you know? • Why should you care?

  27. Essential Questions • Pg. 504 • What does it mean? • How do you know? • Why should you care?

  28. Vocabulary Activity

  29. HW: PTG #1, 2, 5-8, pg. 505-506

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