Transcript © 2004 Plano ISD, Plano, TX © 2004 Plano ISD, Plano, TX.

© 2004 Plano ISD, Plano, TX
© 2004 Plano ISD, Plano, TX
© 2004 Plano ISD, Plano, TX
During every waking and sleeping moment
of our lives, we are bombarded with
of energy.
© 2004 Plano ISD, Plano, TX
Most energy
waves collide with
us or pass right
through us
without any notice
on our part.
© 2004 Plano ISD, Plano, TX
Waves carry
energy, but
not matter.
However,
matter can be
used to
transfer
energy.
Waves that use
matter to
transfer
energy are
mechanical
waves.
The matter
used to
transport the
wave is called
a medium.
What is the
medium?
© 2004 Plano ISD, Plano, TX
What is the
medium?
© 2004 Plano ISD, Plano, TX
What is the
medium?
© 2004 Plano ISD, Plano, TX
In the 15th century,
Leonardo da Vinci
observed that while
waves move, the
medium (water) does
not, “like the waves
made in a field of
grain by the wind,
where we see the
waves running across
the field while the
grain remains in
place.”
© 2004 Plano ISD, Plano, TX
Water,sound, and
earthquake waves are
examples of mechanical
waves.
© 2004 Plano ISD, Plano, TX
Mechanical waves can be classified
according to the direction of the
motion of matter in relation to the
direction of wave motion.
© 2004 Plano ISD, Plano, TX
Mechanical waves in which matter
moves up and down or back and forth
at right angles compared to the
direction of wave movement are
transverse waves.
Click here to see
transverse waves in
action!
© 2004 Plano ISD, Plano, TX
© 2004 Plano ISD, Plano, TX
Mechanical waves in which medium
matter moves forward and backward
in the same direction the wave travels
are longitudinal or compressional
waves.
Click here to see
compressional waves
in action!
© 2004 Plano ISD, Plano, TX
Waves that do not
require matter to
transfer energy are
electromagnetic waves. Electromagnetic waves
can travel through a
medium, but they can
also travel in space or
through a vacuum.
© 2004 Plano ISD, Plano, TX
Radio waves, X-rays,
microwaves, and
visible light waves are
examples of
electromagnetic
waves.
They can all travel
through empty space
and they all travel at
the same speed. This
speed is sometimes
called
The Speed of Light.
© 2004 Plano ISD, Plano, TX
Review the information on
waves by filling in the
concept map.
© 2004 Plano ISD, Plano, TX
energy
Waves
transfer or carry
matter
do not move
or carry
can be classified
into two
categories
mechanical
waves
include
examples such
as
electromagnetic
waves
are further
classified into
are a special
type of
transfer energy
through
matter called a
medium
________
longitudinal
or
compression
waves
transverse
waves
move
move
matter
forward and
backward in
the same
direction of
wave
movement
matter up
and down or
back and
forth at
right angles
compared to
the direction
of wave
movement
includes
solids,
liquids,
gasses
do not
require
matter
to transfer
energy
include
examples such
as
Bibliography
Macaulay, David. (1988). How things work. Boston: Houghton
Mifflin Company. pp. 186
Resnick, Halliday, Krane. (1992). Physics. 4th Edition,
Volume 1. New York: John Wiley & Sons, Inc. pp.
417-418.
“What are waves?” (2002). Texas Science. New York:
Glenco McGraw-Hill,pp. 186-187.
© 2004 Plano ISD, Plano, TX