# Chapter 5, Section 2 - PowerPoint PPT Presentation

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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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Chapter 5, Section 2

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## Chapter 5, Section 2

Making Waves

### 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

• Standing Wave

### 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

• 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:

• Pg. 496-497

• Create data table

• #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, 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

• 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

• They continue to travel as though the other wave never existed.

### 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

### Physics Talk

• Standing Wave

• Wave pattern that remains in a constant position.

• Does not go right/left, but does go up/down.

• 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?