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Waves Jun8
1. Happy Monday!
June 8th 2015
Today’s Objectives:
• Classify a Mechanical wave as Transverse,
Longitudinal, or Surface
• ID the parts of a wave: wavelength, amplitude,
crest, trough, compression, rarefaction, & rest
position
Today’s Agenda:
• Notes & PowerPoint
• Waves Video Activity
• Wave Exit Ticket
2. Waves
• Have you ever been in a wave
pool at an amusement park? How do we know
that energy is being transferred?
3. Mechanical waves
• A mechanical wave is a ___________ in matter
that carries ______ from one place to another
disturban
ce
• Energy is the ability to do _____wor
k• Mechanical waves need a material to travel
through, which is called a ________mediu
m
• A medium can be a solid, ____, or gas
In a wave pool, what is the
medium?
liquid
wate
r
energy
4. • A mechanical wave is created when a source
of energy causes a vibration to travel through
a medium
Mechanical waves
• Think about shaking a rope, when you shake
the rope, you add energy
o The wave that results carries energy along
the rope
5. • Mechanical waves are classified by the way
they move through a medium
Mechanical waves
transvers
e
longitudi
nal
surface
3
7. Transverse wave
• Before the wave, every point is @ resting
position
• The highest point of the wave above the RP is
the _____
• The lowest point below the RP is the ______
crest
troug
h• The crest and the trough are not fixed points
• A transverse wave is a wave that causes the
medium to vibrate at right angles to the
direction in which the wave travels
8. • Imagine shaking a rope attached to a chair
oBy shaking the rope, you create waves that
move up and down
oHowever, the energy is moving from left to
right
oThese two
motions are
perpendicular
to one another
Transverse wave
10. • Examples of transverse waves:
o Shaking a rope up & down that is tied to
something
o Shaking crumbs off of a blanket or sand off of
a beach towel
o Stadium wave at football & basketball games
Transverse wave
11. transverse waves
• In transverse waves, the vibration of the
medium is ___________ to the direction that
the wave travels
perpendicular
12. Longitudinal waves
• However, in a longitudinal wave, the
vibration of the medium is parallel to the
direction the wave travels
rarefaction
compres
sion
13. Longitudinal waves
• To start a LW, add energy via pushing &
pulling
o carries energy from left to right, coils
move closer together or farther apart
14. Longitudinal waves
• Think about a slinky or a spring
oWhen you push it together and pull it
apart, a wave is sent through the slinky
oEach coil in the slinky vibrates back-and-
forth, the wave also travels back-and-forth
oTherefore, the motion of the vibration is
parallel to the direction the wave moves
16. • Label each section as a compression or
rarefaction
Longitudinal waves
A
B
C
D
E
• Remember,
oA compression is an area where the particles
in a medium are spaced ______ together
oA rarefaction is an area where the particles in
a medium are _______ ____
clos
e
sprea ou
rarefact
ion
compressio
n
compressio
n
rarefact
ion
compressio
n
18. Surface waves
• The first waves you probably think of is ocean
waves, which are called surface waves
• A surface wave is a wave that travels along a
surface separating two media
• Ocean waves travel between water & air
• A bobber in the ocean moves up & down
(perpendicular) and back & forth
(parallel) producing a circular motion
19. • Most waves do not transfer matter from one
place to another
• However, as a wave enters shallow water, it
topples over on itself
• Why do you think this happens?
Surface waves
• Friction with the show slows down the
bottom of the wave
• The top of the wave continues forward at its
original speed
21. Properties of mechanical waves
• How do we
describe waves?
• If you like to surf,
fish, or just swim
in the ocean –
you should know
a little
something about
describing
waves...
3 ft. at 8s
SE
2 ft. at 14s
NE
22. • Wavelength is the distance between a
point on one wave & the same point on
the next cycle of the wave
Properties of MWs
Wavelength
23. Wavelength
• The distance between a point on one wave and
the same point on then next cycle of the wave
Which wave has longer
wavelengths?
A
B
https://www.youtube.com/watch?v=aH5r4ZTO
XS4
24. Amplitude
• Amplitude of a wave is the maximum
displacement of the medium from its rest
position
25. Amplitude
• The more ______ a wave has, the greater its
amplitude
• Amplitude of a wave is the maximum
displacement of the medium from its rest
position
energy
26. Waves Video Activity
• For this activity, students will work in groups
of 4-5 to create a 3-5 minute video
explaining the 3 types of mechanical waves
discussed today
• In the video, students should illustrate and
define: mechanical wave, transverse wave,
trough, crest, rest position, longitudinal
wave, compression, rarefaction, surface
wave, medium, wave length, & amptliude
27. Exit Ticket pg. 100
1. Draw a transverse wave. Label the crest,
trough, amplitude, and wavelength.
2. Draw a longitudinal/compressional wave.
Label an area of compression and
rarefaction.
3. Give an example of a surface wave.
4. In what type of wave does the medium
travel perpendicular to the motion of
energy?
5. In what type of wave des the medium travel
parallel to the motion of energy?
