# 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.

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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 – 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

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? 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 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 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 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

#10-13 Demo then in groups #14-Demo, discuss energy #15-groups, discuss a.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 b.As the amplitude of a transverse pulse on a spring increases, its speed remains the same c.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 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 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 Longitudinal Waves Complete all sections, OK with teacher

Part C Big Ideas Compressional/Longitudinal Waves

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 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 Talk How do waves “add”? They continue to travel as though the other wave never existed. http://www.youtube. com/watch?v=Xqo6sE t1cUE http://www.youtube. com/watch?v=Xqo6sE t1cUE

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 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

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 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 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.c om/watch?v=MoVz2ENJ b8M http://www.youtube.c om/watch?v=MoVz2ENJ b8M

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=03cUrk jqdE0 http://www.youtube. com/watch?v=03cUrk jqdE0

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

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

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

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 Pg. 504 – What does it mean? – How do you know? – Why should you care?

Vocabulary Activity Book Definition:Definition in YOUR words ExamplePicture or Equation

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

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