SlideShare a Scribd company logo
1 of 32
Download to read offline
LET’S MAKE
WAVES/
ANATOMY
OF A WAVE
Activity 1 and 2 :
 Discussion
ACTIVITY 1: LET’S MAKE WAVES

Board work: Draw three sketches
of the rope showing the motion
of the pulse at three subsequent
instances (snapshots at three
different times).
Draw an arrow to represent the
direction of the pulse’s motion.
BASED ON THE ILLUSTRATION SHOWN
ON THE BOARD, ANSWER THE FF:
a. What is a wave pulse?
b. What is the source of the wave
pulse?
c. Describe the motion of your
hand as you create the pulse.
d. Describe the motion of the pulse
with respect to the source.
A periodic wave can be regarded as a series
of pulses. One pulse follows another in regular
succession.




               Periodic Wave
BOARDWORK:
Attach a colored ribbon on one part
of the rope. You may use adhesive
tape to fix the ribbon. Make a wave
by continuously vibrating the end of
the rope with quick up-and-down
movements of your hand. (Activity)
Draw the waveform or the shape of
the wave that you have created.
BASED ON YOUR ACTIVITY/ ILLUSTRATION
ON THE BOARD, ANSWER THE FF:
a. Does the wave transport the
colored ribbon from its original
position to the end of the rope?
b. Describe the vibration of the
colored ribbon. How does it move as
waves pass by? Does it move in the
same direction as the wave?
c. Describe transverse waves.
BOARDWORK:

Observe the waves along the
coil spring.
Draw how the coil spring looks
like as you move it back-and-
forth.
Attach a colored ribbon on one part of the
coil spring. You may use an adhesive
tape to fix the ribbon.
Ask a friend to vibrate the coil spring
back-and-forth while you observe the
motion of the colored ribbon.
 Remember that the colored ribbon
serves as a marker of a chosen segment
of the coil spring. (Activity)
BASED ON THE ACTIVTY, ANSWER THE
FF:
a. Does the wave transport the
colored ribbon from its original
position to the end of the coil spring?
b. Describe the vibration of the
colored ribbon. How does it move as
waves pass by?
c. Describe longitudinal waves.
BOARDWORK:
Create a wave pulse by tapping the
surface of the water with your index finger
and observe the direction of travel of the
wave pulse.Tap the surface of the water
at regular intervals to create periodic
waves. (Activity)
View the waves from above and draw the
pattern that you see. In your drawing,
mark the source of the disturbance.
BASED ON THE ACTIVTY, ANSWER
THE FF:
Wait for the water to become still before you
place your paper boat on the surface. Create
periodic waves and observe what happens to
your paper boat. (Activity)
a. Do the waves set the paper boat into
motion? What is required to set an
object into motion?
b. If you exert more energy in creating
periodic waves by tapping the surface
with greater strength, how does this
affect the movement of the paper boat?
If you were somehow able to mark individual water
molecules (you used a colored ribbon to do this) and
follow them as waves pass by, you would find that
their paths are like those shown in the figure below.




                   Surface Waves
a. As shown in the figure, the
passage of a wave across a surface
of a body of water involves the
motion of particles following
a___________ pattern about their
original positions.
b. Does the wave transport water
molecules from the source of the
vibration? Support your answer using
the shown figure.
SUMMARY FOR ACT. 1
1. Waves can be typified according to the
direction of motion of the vibrating
particles with respect to the direction in
which the waves travel.
a. Waves in a rope are called
____________ waves because the
individual segments of the rope vibrate
____________ to the direction in which
the waves travel.
b. When each portion of a coil spring
is alternatively compressed and
extended, ____________ waves are
produced.
c. Waves on the surface of a body of
water are a combination of
transverse and longitudinal waves.
Each water molecule moves in a
_______________ pattern as the
waves pass by.
2. How do we know
that waves carry
energy?
3. What happens
when waves pass by?
ACTIVITY 2. ANATOMY OF A WAVE
HOW DO YOU DESCRIBE WAVES?

Most periodic waves have sinusoidal
waveforms as shown below. The
highest point and lowest point of a
wave are called the crest and the
trough respectively. The amplitude
is the maximum displacement of a
vibrating particle on either side of its
normal position when the wave
passes.
PARTS OF A WAVE
Crest- highest point
Trough- lowest point
Wave length- distance between 2 waves
Wave height- distance from crest to
trough
Amplitude- range from normal position
of wave to either side
 Equilibrium- no disturbance
Sinusoidal Wave
HOW CAN YOU MEASURE THE
WAVELENGTH OF A WAVE?
The wavelength of a wave refers
to the distance between any
successive identical parts of the
wave. For instance, the distance
from one crest to the next is equal
to one full wavelength. In the
following illustration, this is given
by the interval B to F.
Identify the other intervals that
represent one full wavelength.
Place a basin filled with water
on top of a level table. Wait for
the water to become still.
Create a vibration by regularly
tapping the surface of the
water with your index finger.
You would be able to see the
subsequent crest of the water
waves.
Crest and Trough on a Water Wave
BOARDWORK:

Draw the water waves
as you see them from
the top of the basin.
Label one wavelength
in your drawing.
Increase the rate of the vibrations you
create by tapping the surface of the
water rapidly. What happens to the
wavelength of the waves?
______________________________
Draw the water waves as you see
them from the top of the basin.
Compare it with your first drawing.
HOW DO YOU MEASURE THE
FREQUENCY OF A WAVE?
The frequency of a series of periodic
waves is the number of waves that pass a
particular point every one second. It is
also useful to consider the period of a
wave, which is the time required for one
complete wave to pass a given point. The
period of each wave is
                  =   ___1___
From the identified frequency
of the observed periodic
waves, the period can be
calculated. For example, if two
waves per second are passing
by, each wave has a period of
½ seconds.
Show your table on the board.
If you increase the
frequency of vibration by
jerking the end of the
rope at a faster rate,
what happens to the
wavelength?
HOW DO YOU MEASURE THE SPEED OF
A WAVE?
The wave speed is the distance traveled
by the wave per second.
           =(                            )
=                      ℎ
From the basic formula that applies to all
periodic waves, you can see that wave
speed, frequency and wavelength are
independent of the wave’s amplitude.
SUMMARY:
1. What is the relationship between wave
speed, wavelength and
frequency?
2. Suppose you observed an anchored boat to
rise and fall once every 4.0 seconds as waves
whose crests are 25 meters apart pass by it.
a. What is the frequency of the observed
waves?
b. What is the speed of the waves?
Let’s make waves

More Related Content

What's hot

ACTIVITY NO. 1: LET'S MAKE WAVES!
ACTIVITY NO. 1: LET'S MAKE WAVES!ACTIVITY NO. 1: LET'S MAKE WAVES!
ACTIVITY NO. 1: LET'S MAKE WAVES!Hello Hello
 
Characteristics of light
Characteristics of lightCharacteristics of light
Characteristics of light2015EmilyTripp
 
Science 8 module 1 Forces and Motion
Science 8 module 1 Forces and MotionScience 8 module 1 Forces and Motion
Science 8 module 1 Forces and MotionVenus Metilla
 
Grade 9 uniformly accelerated motion
Grade 9 uniformly accelerated motionGrade 9 uniformly accelerated motion
Grade 9 uniformly accelerated motionjulmajir salipmugdar
 
Grade 8 science teacher's guide
Grade 8 science teacher's guideGrade 8 science teacher's guide
Grade 8 science teacher's guideiteach 2learn
 
Science 7 - Describing Motion
Science 7 - Describing MotionScience 7 - Describing Motion
Science 7 - Describing MotionMerra Mae Ramos
 
Grade 7 science 4th Quarter M1
Grade 7 science 4th Quarter M1Grade 7 science 4th Quarter M1
Grade 7 science 4th Quarter M1Alfred Gico
 
K TO 12 GRADE 7 LEARNING MODULE IN SCIENCE (Q3-Q4)
K TO 12 GRADE 7 LEARNING MODULE IN SCIENCE (Q3-Q4)K TO 12 GRADE 7 LEARNING MODULE IN SCIENCE (Q3-Q4)
K TO 12 GRADE 7 LEARNING MODULE IN SCIENCE (Q3-Q4)LiGhT ArOhL
 
Module 15 waves carriers of energy
Module 15  waves carriers of energyModule 15  waves carriers of energy
Module 15 waves carriers of energydionesioable
 
Colors of light activity 1
Colors of light activity 1Colors of light activity 1
Colors of light activity 1Gina Vargas
 
Earthquakes and faults (Grade 8 Lesson)
Earthquakes and faults (Grade 8 Lesson) Earthquakes and faults (Grade 8 Lesson)
Earthquakes and faults (Grade 8 Lesson) Riya Duran
 
Integrated Science Module for Grade 7 --Quarter 3-4
Integrated Science Module for Grade  7 --Quarter 3-4Integrated Science Module for Grade  7 --Quarter 3-4
Integrated Science Module for Grade 7 --Quarter 3-4John Rennen Quezada
 
Science Grade 8 Teachers Manual
Science Grade 8 Teachers ManualScience Grade 8 Teachers Manual
Science Grade 8 Teachers ManualOrland Marc Enquig
 
Exam grade 8 2nd q
Exam grade 8 2nd qExam grade 8 2nd q
Exam grade 8 2nd q09460460631
 

What's hot (20)

ELECTRICITY grade 8 DEMO CO
ELECTRICITY grade 8 DEMO COELECTRICITY grade 8 DEMO CO
ELECTRICITY grade 8 DEMO CO
 
ACTIVITY NO. 1: LET'S MAKE WAVES!
ACTIVITY NO. 1: LET'S MAKE WAVES!ACTIVITY NO. 1: LET'S MAKE WAVES!
ACTIVITY NO. 1: LET'S MAKE WAVES!
 
Describing motion
Describing motionDescribing motion
Describing motion
 
Characteristics of light
Characteristics of lightCharacteristics of light
Characteristics of light
 
Science 8 module 1 Forces and Motion
Science 8 module 1 Forces and MotionScience 8 module 1 Forces and Motion
Science 8 module 1 Forces and Motion
 
Science 10 Quarter 1 Module 1 Volcanoes, Earthquake and Mountain Ranges
Science 10 Quarter 1 Module 1 Volcanoes, Earthquake and Mountain RangesScience 10 Quarter 1 Module 1 Volcanoes, Earthquake and Mountain Ranges
Science 10 Quarter 1 Module 1 Volcanoes, Earthquake and Mountain Ranges
 
Grade 9 uniformly accelerated motion
Grade 9 uniformly accelerated motionGrade 9 uniformly accelerated motion
Grade 9 uniformly accelerated motion
 
Grade 8 science teacher's guide
Grade 8 science teacher's guideGrade 8 science teacher's guide
Grade 8 science teacher's guide
 
Science 7 - Describing Motion
Science 7 - Describing MotionScience 7 - Describing Motion
Science 7 - Describing Motion
 
Grade 7 science 4th Quarter M1
Grade 7 science 4th Quarter M1Grade 7 science 4th Quarter M1
Grade 7 science 4th Quarter M1
 
Grade 10 Science Quarter 1 Module 1
Grade 10 Science Quarter 1 Module 1Grade 10 Science Quarter 1 Module 1
Grade 10 Science Quarter 1 Module 1
 
Sound grade 7
Sound grade 7Sound grade 7
Sound grade 7
 
K TO 12 GRADE 7 LEARNING MODULE IN SCIENCE (Q3-Q4)
K TO 12 GRADE 7 LEARNING MODULE IN SCIENCE (Q3-Q4)K TO 12 GRADE 7 LEARNING MODULE IN SCIENCE (Q3-Q4)
K TO 12 GRADE 7 LEARNING MODULE IN SCIENCE (Q3-Q4)
 
Module 15 waves carriers of energy
Module 15  waves carriers of energyModule 15  waves carriers of energy
Module 15 waves carriers of energy
 
Colors of light activity 1
Colors of light activity 1Colors of light activity 1
Colors of light activity 1
 
Characteristics of stars
Characteristics of starsCharacteristics of stars
Characteristics of stars
 
Earthquakes and faults (Grade 8 Lesson)
Earthquakes and faults (Grade 8 Lesson) Earthquakes and faults (Grade 8 Lesson)
Earthquakes and faults (Grade 8 Lesson)
 
Integrated Science Module for Grade 7 --Quarter 3-4
Integrated Science Module for Grade  7 --Quarter 3-4Integrated Science Module for Grade  7 --Quarter 3-4
Integrated Science Module for Grade 7 --Quarter 3-4
 
Science Grade 8 Teachers Manual
Science Grade 8 Teachers ManualScience Grade 8 Teachers Manual
Science Grade 8 Teachers Manual
 
Exam grade 8 2nd q
Exam grade 8 2nd qExam grade 8 2nd q
Exam grade 8 2nd q
 

Viewers also liked

Consumer-Oriented Pulse Wave Analyzer (PWA)
Consumer-Oriented Pulse Wave Analyzer (PWA)Consumer-Oriented Pulse Wave Analyzer (PWA)
Consumer-Oriented Pulse Wave Analyzer (PWA)Len Malinin
 
Determining the number of wavelengths in a wave diagram
Determining the number of wavelengths in a wave diagramDetermining the number of wavelengths in a wave diagram
Determining the number of wavelengths in a wave diagramkhonkane
 
Rocks AND SOIL FORMATION
Rocks AND SOIL FORMATIONRocks AND SOIL FORMATION
Rocks AND SOIL FORMATIONMoses Lutta
 
Kolonyalismo at Imperyalismo sa Silangang Asya
Kolonyalismo at Imperyalismo sa Silangang AsyaKolonyalismo at Imperyalismo sa Silangang Asya
Kolonyalismo at Imperyalismo sa Silangang AsyaJuan Miguel Palero
 
Seismic Waves
Seismic WavesSeismic Waves
Seismic Wavescharsh
 
Levels Of Organization
Levels Of OrganizationLevels Of Organization
Levels Of Organizationsth215
 
1.4 Laboratory Equipment: Names & Uses
1.4 Laboratory Equipment:  Names & Uses1.4 Laboratory Equipment:  Names & Uses
1.4 Laboratory Equipment: Names & UsesCheryl Bausman
 

Viewers also liked (16)

Q3 q4 teachers guide v1.0
Q3 q4 teachers guide v1.0Q3 q4 teachers guide v1.0
Q3 q4 teachers guide v1.0
 
Describing motion 2
Describing motion 2Describing motion 2
Describing motion 2
 
Consumer-Oriented Pulse Wave Analyzer (PWA)
Consumer-Oriented Pulse Wave Analyzer (PWA)Consumer-Oriented Pulse Wave Analyzer (PWA)
Consumer-Oriented Pulse Wave Analyzer (PWA)
 
Determining the number of wavelengths in a wave diagram
Determining the number of wavelengths in a wave diagramDetermining the number of wavelengths in a wave diagram
Determining the number of wavelengths in a wave diagram
 
Waves around you
Waves around youWaves around you
Waves around you
 
Waves Around You
Waves Around YouWaves Around You
Waves Around You
 
Mechanical vs electromagnetic waves
Mechanical vs electromagnetic wavesMechanical vs electromagnetic waves
Mechanical vs electromagnetic waves
 
Rocks AND SOIL FORMATION
Rocks AND SOIL FORMATIONRocks AND SOIL FORMATION
Rocks AND SOIL FORMATION
 
Soil formation
Soil formationSoil formation
Soil formation
 
Distance and displacement
Distance and displacementDistance and displacement
Distance and displacement
 
Kolonyalismo at Imperyalismo sa Silangang Asya
Kolonyalismo at Imperyalismo sa Silangang AsyaKolonyalismo at Imperyalismo sa Silangang Asya
Kolonyalismo at Imperyalismo sa Silangang Asya
 
Science tg-g7
Science tg-g7Science tg-g7
Science tg-g7
 
How do people destroy natural resources
How do people destroy natural resourcesHow do people destroy natural resources
How do people destroy natural resources
 
Seismic Waves
Seismic WavesSeismic Waves
Seismic Waves
 
Levels Of Organization
Levels Of OrganizationLevels Of Organization
Levels Of Organization
 
1.4 Laboratory Equipment: Names & Uses
1.4 Laboratory Equipment:  Names & Uses1.4 Laboratory Equipment:  Names & Uses
1.4 Laboratory Equipment: Names & Uses
 

Similar to Let’s make waves

S4 E Phy Waves(Tranverse)(T)
S4 E Phy Waves(Tranverse)(T)S4 E Phy Waves(Tranverse)(T)
S4 E Phy Waves(Tranverse)(T)guest73629
 
Waves basicsstuver-100518155745-phpapp02
Waves basicsstuver-100518155745-phpapp02Waves basicsstuver-100518155745-phpapp02
Waves basicsstuver-100518155745-phpapp02Daniella Vineyard
 
Unit 4 2014 ppt wave characteristics
Unit 4 2014  ppt    wave characteristicsUnit 4 2014  ppt    wave characteristics
Unit 4 2014 ppt wave characteristicsDavid Young
 
Medical Physics.gyfdtydsrsustusttdrsdrrd
Medical Physics.gyfdtydsrsustusttdrsdrrdMedical Physics.gyfdtydsrsustusttdrsdrrd
Medical Physics.gyfdtydsrsustusttdrsdrrdhamdirage35
 
3 wave representations
3 wave representations3 wave representations
3 wave representationsMissingWaldo
 
Exp SPA - Chp 12 General Wave Properties
Exp SPA - Chp 12 General Wave PropertiesExp SPA - Chp 12 General Wave Properties
Exp SPA - Chp 12 General Wave Propertiesharrywwh
 
Waves _______________________ (Name) How do ocea.docx
Waves _______________________ (Name) How do ocea.docxWaves _______________________ (Name) How do ocea.docx
Waves _______________________ (Name) How do ocea.docxmelbruce90096
 
Physics ii djy 2013 ppt wave characteristics
Physics ii djy 2013 ppt    wave characteristicsPhysics ii djy 2013 ppt    wave characteristics
Physics ii djy 2013 ppt wave characteristicsDavid Young
 
Phy exppp chap11
Phy exppp chap11Phy exppp chap11
Phy exppp chap11hmsoh
 
General Wave Properties
General Wave PropertiesGeneral Wave Properties
General Wave PropertiesShafie Sofian
 

Similar to Let’s make waves (20)

Chapter16openstax
Chapter16openstaxChapter16openstax
Chapter16openstax
 
Waves
WavesWaves
Waves
 
S4 E Phy Waves(Tranverse)(T)
S4 E Phy Waves(Tranverse)(T)S4 E Phy Waves(Tranverse)(T)
S4 E Phy Waves(Tranverse)(T)
 
Waves
Waves Waves
Waves
 
Topic 3 waves
Topic 3 wavesTopic 3 waves
Topic 3 waves
 
Waves Basics
Waves BasicsWaves Basics
Waves Basics
 
Waves basicsstuver-100518155745-phpapp02
Waves basicsstuver-100518155745-phpapp02Waves basicsstuver-100518155745-phpapp02
Waves basicsstuver-100518155745-phpapp02
 
Unit 4 2014 ppt wave characteristics
Unit 4 2014  ppt    wave characteristicsUnit 4 2014  ppt    wave characteristics
Unit 4 2014 ppt wave characteristics
 
Medical Physics.gyfdtydsrsustusttdrsdrrd
Medical Physics.gyfdtydsrsustusttdrsdrrdMedical Physics.gyfdtydsrsustusttdrsdrrd
Medical Physics.gyfdtydsrsustusttdrsdrrd
 
Lab 25
Lab 25Lab 25
Lab 25
 
3 wave representations
3 wave representations3 wave representations
3 wave representations
 
Exp SPA - Chp 12 General Wave Properties
Exp SPA - Chp 12 General Wave PropertiesExp SPA - Chp 12 General Wave Properties
Exp SPA - Chp 12 General Wave Properties
 
Waves _______________________ (Name) How do ocea.docx
Waves _______________________ (Name) How do ocea.docxWaves _______________________ (Name) How do ocea.docx
Waves _______________________ (Name) How do ocea.docx
 
4.2
4.24.2
4.2
 
Physics ii djy 2013 ppt wave characteristics
Physics ii djy 2013 ppt    wave characteristicsPhysics ii djy 2013 ppt    wave characteristics
Physics ii djy 2013 ppt wave characteristics
 
Phy exppp chap11
Phy exppp chap11Phy exppp chap11
Phy exppp chap11
 
4.2
4.24.2
4.2
 
Module No. 42
Module No. 42Module No. 42
Module No. 42
 
General Wave Properties
General Wave PropertiesGeneral Wave Properties
General Wave Properties
 
Module No. 44
Module No. 44Module No. 44
Module No. 44
 

More from Makati Science High School

Types of graphs and charts and their uses with examples and pics
Types of graphs and charts and their uses  with examples and picsTypes of graphs and charts and their uses  with examples and pics
Types of graphs and charts and their uses with examples and picsMakati Science High School
 

More from Makati Science High School (20)

Writing a Scientific Paper
Writing a Scientific PaperWriting a Scientific Paper
Writing a Scientific Paper
 
Research Paper Rubrics 2020
Research Paper Rubrics 2020Research Paper Rubrics 2020
Research Paper Rubrics 2020
 
Statistical test discuss 5
Statistical test discuss 5Statistical test discuss 5
Statistical test discuss 5
 
Measures of variation discuss 2.1
Measures of variation discuss  2.1Measures of variation discuss  2.1
Measures of variation discuss 2.1
 
Measures of dispersion discuss 2.2
Measures of dispersion discuss 2.2Measures of dispersion discuss 2.2
Measures of dispersion discuss 2.2
 
Materials and methods discuss
Materials and methods  discussMaterials and methods  discuss
Materials and methods discuss
 
Inferential stat tests samples discuss 4
Inferential stat tests samples discuss 4Inferential stat tests samples discuss 4
Inferential stat tests samples discuss 4
 
Ds vs Is discuss 3.1
Ds vs Is discuss 3.1Ds vs Is discuss 3.1
Ds vs Is discuss 3.1
 
Descriptive inferential-discuss 1
Descriptive  inferential-discuss 1Descriptive  inferential-discuss 1
Descriptive inferential-discuss 1
 
Central tendency m,m,m 1.2
Central tendency m,m,m 1.2Central tendency m,m,m 1.2
Central tendency m,m,m 1.2
 
Central tendency discuss 2
Central tendency  discuss 2Central tendency  discuss 2
Central tendency discuss 2
 
Types of graphs and charts and their uses with examples and pics
Types of graphs and charts and their uses  with examples and picsTypes of graphs and charts and their uses  with examples and pics
Types of graphs and charts and their uses with examples and pics
 
Levels of measurement discuss
Levels of measurement   discussLevels of measurement   discuss
Levels of measurement discuss
 
Gantt chart discuss 3
Gantt chart discuss 3Gantt chart discuss 3
Gantt chart discuss 3
 
Gantt chart discuss 2
Gantt chart discuss 2Gantt chart discuss 2
Gantt chart discuss 2
 
Gantt chart discuss 1
Gantt chart discuss 1Gantt chart discuss 1
Gantt chart discuss 1
 
Research Designs -9 experimental Designs
Research Designs -9 experimental DesignsResearch Designs -9 experimental Designs
Research Designs -9 experimental Designs
 
Research designs Pt 1
Research designs Pt 1Research designs Pt 1
Research designs Pt 1
 
Identifying variables
Identifying variablesIdentifying variables
Identifying variables
 
Kinds and classifications of research
Kinds and classifications of researchKinds and classifications of research
Kinds and classifications of research
 

Let’s make waves

  • 2. Activity 1 and 2 : Discussion
  • 3. ACTIVITY 1: LET’S MAKE WAVES Board work: Draw three sketches of the rope showing the motion of the pulse at three subsequent instances (snapshots at three different times). Draw an arrow to represent the direction of the pulse’s motion.
  • 4. BASED ON THE ILLUSTRATION SHOWN ON THE BOARD, ANSWER THE FF: a. What is a wave pulse? b. What is the source of the wave pulse? c. Describe the motion of your hand as you create the pulse. d. Describe the motion of the pulse with respect to the source.
  • 5. A periodic wave can be regarded as a series of pulses. One pulse follows another in regular succession. Periodic Wave
  • 6. BOARDWORK: Attach a colored ribbon on one part of the rope. You may use adhesive tape to fix the ribbon. Make a wave by continuously vibrating the end of the rope with quick up-and-down movements of your hand. (Activity) Draw the waveform or the shape of the wave that you have created.
  • 7. BASED ON YOUR ACTIVITY/ ILLUSTRATION ON THE BOARD, ANSWER THE FF: a. Does the wave transport the colored ribbon from its original position to the end of the rope? b. Describe the vibration of the colored ribbon. How does it move as waves pass by? Does it move in the same direction as the wave? c. Describe transverse waves.
  • 8. BOARDWORK: Observe the waves along the coil spring. Draw how the coil spring looks like as you move it back-and- forth.
  • 9. Attach a colored ribbon on one part of the coil spring. You may use an adhesive tape to fix the ribbon. Ask a friend to vibrate the coil spring back-and-forth while you observe the motion of the colored ribbon. Remember that the colored ribbon serves as a marker of a chosen segment of the coil spring. (Activity)
  • 10. BASED ON THE ACTIVTY, ANSWER THE FF: a. Does the wave transport the colored ribbon from its original position to the end of the coil spring? b. Describe the vibration of the colored ribbon. How does it move as waves pass by? c. Describe longitudinal waves.
  • 11. BOARDWORK: Create a wave pulse by tapping the surface of the water with your index finger and observe the direction of travel of the wave pulse.Tap the surface of the water at regular intervals to create periodic waves. (Activity) View the waves from above and draw the pattern that you see. In your drawing, mark the source of the disturbance.
  • 12. BASED ON THE ACTIVTY, ANSWER THE FF: Wait for the water to become still before you place your paper boat on the surface. Create periodic waves and observe what happens to your paper boat. (Activity) a. Do the waves set the paper boat into motion? What is required to set an object into motion? b. If you exert more energy in creating periodic waves by tapping the surface with greater strength, how does this affect the movement of the paper boat?
  • 13. If you were somehow able to mark individual water molecules (you used a colored ribbon to do this) and follow them as waves pass by, you would find that their paths are like those shown in the figure below. Surface Waves
  • 14. a. As shown in the figure, the passage of a wave across a surface of a body of water involves the motion of particles following a___________ pattern about their original positions. b. Does the wave transport water molecules from the source of the vibration? Support your answer using the shown figure.
  • 15. SUMMARY FOR ACT. 1 1. Waves can be typified according to the direction of motion of the vibrating particles with respect to the direction in which the waves travel. a. Waves in a rope are called ____________ waves because the individual segments of the rope vibrate ____________ to the direction in which the waves travel.
  • 16. b. When each portion of a coil spring is alternatively compressed and extended, ____________ waves are produced. c. Waves on the surface of a body of water are a combination of transverse and longitudinal waves. Each water molecule moves in a _______________ pattern as the waves pass by.
  • 17. 2. How do we know that waves carry energy? 3. What happens when waves pass by?
  • 18. ACTIVITY 2. ANATOMY OF A WAVE HOW DO YOU DESCRIBE WAVES? Most periodic waves have sinusoidal waveforms as shown below. The highest point and lowest point of a wave are called the crest and the trough respectively. The amplitude is the maximum displacement of a vibrating particle on either side of its normal position when the wave passes.
  • 19. PARTS OF A WAVE Crest- highest point Trough- lowest point Wave length- distance between 2 waves Wave height- distance from crest to trough Amplitude- range from normal position of wave to either side  Equilibrium- no disturbance
  • 21. HOW CAN YOU MEASURE THE WAVELENGTH OF A WAVE? The wavelength of a wave refers to the distance between any successive identical parts of the wave. For instance, the distance from one crest to the next is equal to one full wavelength. In the following illustration, this is given by the interval B to F.
  • 22. Identify the other intervals that represent one full wavelength.
  • 23. Place a basin filled with water on top of a level table. Wait for the water to become still. Create a vibration by regularly tapping the surface of the water with your index finger. You would be able to see the subsequent crest of the water waves.
  • 24. Crest and Trough on a Water Wave
  • 25. BOARDWORK: Draw the water waves as you see them from the top of the basin. Label one wavelength in your drawing.
  • 26. Increase the rate of the vibrations you create by tapping the surface of the water rapidly. What happens to the wavelength of the waves? ______________________________ Draw the water waves as you see them from the top of the basin. Compare it with your first drawing.
  • 27. HOW DO YOU MEASURE THE FREQUENCY OF A WAVE? The frequency of a series of periodic waves is the number of waves that pass a particular point every one second. It is also useful to consider the period of a wave, which is the time required for one complete wave to pass a given point. The period of each wave is = ___1___
  • 28. From the identified frequency of the observed periodic waves, the period can be calculated. For example, if two waves per second are passing by, each wave has a period of ½ seconds. Show your table on the board.
  • 29. If you increase the frequency of vibration by jerking the end of the rope at a faster rate, what happens to the wavelength?
  • 30. HOW DO YOU MEASURE THE SPEED OF A WAVE? The wave speed is the distance traveled by the wave per second. =( ) = ℎ From the basic formula that applies to all periodic waves, you can see that wave speed, frequency and wavelength are independent of the wave’s amplitude.
  • 31. SUMMARY: 1. What is the relationship between wave speed, wavelength and frequency? 2. Suppose you observed an anchored boat to rise and fall once every 4.0 seconds as waves whose crests are 25 meters apart pass by it. a. What is the frequency of the observed waves? b. What is the speed of the waves?