Chapter 5, Section 2 Making Waves

2/15/12 HW: PTG #1, 2, 5-8, pg Due Tuesday 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: – 5.1 Quiz – Write LO and SC on a new left- side page – WDYS/WDYT pg. 492

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

2/17/12 HW: PTG #1, 2, 5-8, pg Due Tues 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: – Brain Dump: List everything you know about waves

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.

2/20/12 HW: PTG #1, 2, 5-8, pg , Due Tues 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 on pg , #6-7. Set up places to answer questions underneath data table.

Investigate: Part B Transverse Waves Demo #1-5 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

2/21/12 HW: PTG #1, 2, 5-8, pg 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 #13-15 – Pg – 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.

2/22/12 HW: PTG #1, 2, 5-8, pg 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

Investigate: Part D Skip

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. com/watch?v=Xqo6sE t1cUE 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 om/watch?v=MoVz2ENJ b8M 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. com/watch?v=03cUrk jqdE0 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

January 12, 2011 HW: Finish Vocab Boxes 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