Bell
Work
• List 5 different
kinds of waves
you have seen in
your lifetime.
What are Waves?
Objectives:
• How do matter and
energy interact when
waves are generated?
• What are the three
main types of waves?
What is a WAVE?
• A disturbance that transfers energy from
place to place.
• Waves carry energy!
• After the wave has moved, the disturbance
is gone. Everything is calm again.
How does a wave travel?
• A wave must have something to
travel through. MATTER!
• The material through which a
wave travels through is called a
medium.
What are some examples of
mediums that waves can travel
through?
Mechanical Waves
• Waves that require a
medium through which
to travel through are
called mechanical
waves.
• Waves do not carry the
medium as they move
through it.
• Waves just carry
energy.
• The duck does
not move
sideways toward
to shore.
• The duck moves
up and down and
the WAVE moves
toward to shore.
Electromagnetic Waves
• Not all waves require
a medium in order to
travel.
• Light from the sun can
travel through empty
space. Empty space
is not a medium
What CAUSES waves?
• Waves are generated when a source
of energy forces the matter in a
medium to vibrate.
• Vibration is a repeated back-and-forth
or up-and-down motion.
• Motion is the source of the wave.
The transfer of energy:
• A moving object has
energy.
• The moving object can
transfer energy to a
nearby medium,
creating a wave.
Wave Motion
Waves
transfer
Energy
include
include
Electromagnetic
waves
don’t
require
Mechanical
waves
require
A medium to
pass through
Classification
•
•
Waves are classified according to how they travel
through a medium.
Three types of waves:
1. Transverse waves
2. Longitudinal waves
3. Surface waves
Transverse Wave
• Waves that move the medium at right
angels to the direction in which the waves
are traveling.
• Across
• Highest part of the wave is called the crest.
• The lowest part of the wave is called a
trough.
Transverse Wave
Can you think of any transverse
waves?
Longitudinal Wave
• Moves the particles of the medium parallel to the
direction that the waves are traveling.
• Coils of a spring
• Compressions – parts where the coils are close
together
• Rarefactions – parts where the coils are spread out
Longitudinal Wave
Can you think of any
longitudinal waves?
Surface Wave
• Combinations of transverse and
longitudinal waves.
• The waves occur at the surface
between two media, such as water and
air.
• Up and down and back and forth
Objectives Review:
• How do matter and energy interact
when waves are generated?
• What are the three main types of
waves?
Assignment: