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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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february 17 2012 hw ptg 1 2 5 8 pg 505 506 due next wednesday thursday
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
investigate part a
Investigate: Part A
  • Stadium Wave
  • Standing Wave
  • #1-Answer a-d in your notebook
do now
Do Now
  • Draw a wave
  • Label as many parts as you can of the wave.
  • Read page 494 #4, 5, 6, 7
part a big idea
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.
investigate part b
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
exit ticket
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___________.
february 23 2012
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
slide9

#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.
february 22 2012 hw ptg 1 2 5 8 pg 505 506 due wed bring tissues
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
part b big ideas
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:
investigate part c
Investigate: Part C
  • Longitudinal Waves
  • Complete all sections, OK with teacher
part c big ideas
Part C Big Ideas
  • Compressional/Longitudinal Waves
physics talk
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.
physics talk1
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!
physics talk2
Physics Talk
  • How do waves “add”?
  • They continue to travel as though the other wave never existed.
  • http://www.youtube.com/watch?v=Xqo6sEt1cUE
physics talk3
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
physics talk4
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
slide19

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)
physics talk5
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
physics talk6
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
physics talk7
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
slide23

Node

  • Antinode
  • Place on a standing wave that is motionless
  • Point on a standing wave where the displacement (movement) is greatest
slide24

What type of wave is sound?

  • Compression Wave
  • Air molecules get compressed and move through the air
slide25

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

slide26

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