1. Ocean waves, like all mechanical waves, carry energy through a medium
Chapter 17
Mechanical Waves
and Sound
Ocean waves, like all mechanical waves, carry energy through a medium

2. 17.1 Mechanical Waves Key Concepts What causes mechanical waves?
What are the three main types of mechanical
waves?

3. What Are Mechanical Waves?
A mechanical wave is a ____________ in matter that carries __________ from one place to another.
Recall that energy is the ability to do _________
The material through which a wave moves is
called a _________________
Solids, liquids, and gases can act as
mediums
disturbance
energy
work
medium

4. In a wave pool, ________________ is the medium.
You can see the effects of a wave’s energy when the wave ____________ people in the water (work)
water
lifts

5. What Are Mechanical Waves?
A mechanical wave is created when some source of energy causes a ________________ to travel through a medium.
A vibration is a repeating _________-and-__________ motion.
When you shake a rope, you add energy
at _______ end…the wave that results is a
vibration that carries energy ______________ the rope
vibration
back
forth
one
along

6. Types of Mechanical Waves
The three main types of mechanical waves are…
______________________ waves
_______________________waves
Mechanical waves are classified by the ________ ________________ through a medium.
transverse
longitudinal
surface
way
they move

7. Types of Mechanical Waves
The highest point of the wave is the _____________.
The lowest point of the wave is the ______________
A single point vibrates ______ and __________ between a crest and trough.
crest
trough up
down
Crest
Rest position
Direction of vibration
Rest position
Trough

8. Types of Mechanical Waves
A transverse wave causes the medium to vibrate in a direction __________________ or in a ______________ to the direction in which the wave travels.
The wave carries energy from ______________, in a direction perpendicular to the _________________ motion of the wave.
right angle
perpendicular
Direction of wave
Crest
left to right
up and down

9. Types of Mechanical Waves
A good example of a transverse wave is shaking sand off of a beach blanket
You shake the blanket
___________________
The transverse wave moves
______________ the
blanket
up and down
along

10. Types of Mechanical Waves
Longitudinal Waves
In a spring toy, the wave carries energy _____________the spring.
An area where the particles in a
medium are spaced close together is
called a _______________________
medium are spread out is called
a ________________________
along
compression
rarefaction

11. Types of Mechanical Waves
A compression starts to _______ along the spring.
A rarefaction ______________the compression along the spring.
move
Push
Compression
Pull
Direction of wave
Rarefaction
follows
Compression
Rest position

12. Types of Mechanical Waves
A longitudinal wave is a wave in which the vibration of the medium is _______________
to the direction the wave travels.
parallel

13. Another type of longitudinal wave is called a ____ wave or ______________ wave
Caused by earthquakes
Since P waves can travel through the earth, scientists use these waves to _______ Earth’s unseen interior P
primary
map

14. Types of Mechanical Waves
Surface Waves
Ocean waves are the most
familiar kind of ______________
waves.
A surface wave is a wave that
travels along a surface _______________ two media.
surface
between

15. Types of Mechanical Waves
Wave direction
The ocean wave shown travels at the surface between __________ and ________
The floating fishing bobber helps to visualize the motion of the medium as the wave moves ________________________
air
water
energy from left to right

16. Types of Mechanical Waves
Wave direction
When a crest passes the bobber, the bobber moves ________
When a trough passes the bobber, the bobber moves ___________
This up and down motion is similar to a _________________ wave up
down
transverse

17. Types of Mechanical Waves
Wave direction
The surface wave also pushes the bobber ____________ and _____________ like a longitudinal wave
When these two motions ________________ (up-down) and (back-forth) the bobber ends up moving in a _______________
back
forth
combine
circle

18. Types of Mechanical Waves
Oceans waves behave differently near the shore because ______________ with the shore slows down the _____________ of the wave
friction
bottom

19. A mechanical wave carries energy from one place to another through the
Assessment Questions
A mechanical wave carries energy from one place to another through the
physical transfer of matter.
interaction of electromagnetic fields.
phase changes of a medium.
vibration of a medium.

20. Assessment Questions
In what type of wave is the vibration of the medium only parallel to the direction in which the wave travels?
transverse wave
longitudinal wave
surface wave
rarefaction

21. Assessment Questions
3. As a surface wave travels across water, molecules of water move in a circular pattern. True False