After you turn in the pHet
density lab, You will need:
 One person should pick up a large white
board and the other person in your team
should pick up…
 2 markers; box of letters: A, B, C, D; eraser
1-3. Define density on your
board
 Include the words:
 1. physical property
 2. mass
 3. volume
 Underline the words when you do this.
We must appreciated the definition of energy and
the ultimate source of energy as the overall
common thread to this course.
Before we can study
anything in physics…
What is the ultimate source
of energy for the earth?
The sun!
General break-down (copy this)
More details on the atmosphere
(add these facts, too.)
Phase changes: Mr. Anderson
https://www.youtube.com/watch?v=LG7pLufXAo
Chemical vs. Physical Quiz
http://vital.cs.ohio.edu/?page_id=161
Energy transfer: Mr. Anderson
https://www.youtube.com/w
atch?v=fe_fFFrVl7U
http://www.b
enwiens.com/
energy1.html
#energy1.1
Electrical energy
Forms of heat energy transfer
http://www.aplusphysics.com/co
urses/regents/WEP/regentsenergy.html
4.
6.
a. wavelength
b. amplitude
c. crest
d. trough
5.
What is each of these parts of a wave?
4.
C. crest
A. wavelength
6.
5.
D. trough
7.Our eyes give off light so
that we can see.
 A. true
 B. false
7.Our eyes give off light so
that we can see.
 B. false
 A. longitudinal
 B. transverse
 B. transverse
9. What is the definition of
reflection that you recall?
The throwing back of
light, heat, or sound by a
body or surface without
absorbing it.
9. What is the definition of
reflection?
 B. The throwing back by a
body or surface of light,
heat, or sound without
absorbing it.
10. What is the inside color of a
rainbow?
10. What is the inside color of a
rainbow?
Why does this make sense?
Where does daylight come from?
…8 minutes
What is the speed of sunlight to earth?
300,000,000m/s
The speed of sound is only 340 m/s
How do those beams travel to the
earth?
http://www.y
outube.com/
watch?v=7nS
_aR8XX_U
(1.5min)
 Light Wave – transverse wave
http://www.youtub
e.com/watch?v=7c
DAYFTXq3E
( 25 sec)
1. transverse
crest
wavelength
trough
wavelength
Do the
WAVE!!!
http://www.neok12.com/Light-Optics.htm (3:00 min)
Electromagnetic Spectrum:
Radio
Waves
Microwave
Visible
Light
Infrared
Ultraviolet
X-Rays Gamma
Rays
http://www.bbc.co.uk/schools/g
csebitesize/science/edexcel/el
ectromagnetic_spectrum/elect
romagneticspectrumact.shtml
YES
The sun releases UV/visible/IR radiation:
Radio
Waves
Microwave
Long waves =
Low frequency=
less intense
Visible
Light
Ultraviolet
X-Rays Gamma
Rays
Infrared
Short wavelength =
High frequency=
more intense
The sun
What if the sun burns
out?
How long before we
would know it
happened?
8 minutes
Spectrum of the sun
 Some colors are
brighter
(green/yellow)
 Black are colors not
emitted (no one
knows why)
 Gases above sun
absorb some light
The widest measured band is green…
Why isn’t the sun green?
What happens if I shine a green light at a green sun?
All the colors are mixed, so
Why isn’t the sun white then?
??????????
http://www.youtube.com/watch?v=C84HDYn2kWw
Whatever color the sun…
It does emit the most green…
Yet the sun does not appear
green.
We see things because they
reflect light into our eyes.
Reflection:
 the throwing back of light, heat, or sound by
a body or surface
it.
WHAT DID YOU LEARN IN LAB?
Write in your notes what you
think you would see written
on the bug deflector when
you walk up to an ambulance.
 Basically… how would the word
be written, so that a
driver can read it in his/her review mirror?
WHAT DID YOU LEARN IN LAB?
 An ambulance looks
like this straight on.
 In your mirror it looks
like this.
Warm – up 9-12-2014
 We talked about
 1. Does the speed of
wavelength, frequency
and the speed of light.
 Put your name on the
notecard that is at your
table and answer these
two questions as
ACCURATELY as
possible.
light change from red
to violet light? How?
 2. Describe the
relationship between
the frequency and the
wavelength of these
two colors of light.
Energy
 The sun is our ultimate
source of energy…
 We ‘discussed the
difference between UV
and IR,
 How does this relate to
our planet?
 http://www.youtube.com
/watch?v=OqVyRa1iuMc
 And…How do we define
‘energy’?
Let’s check these out…
 http://education-
portal.com/academy/le
sson/what-is-energydefinition-andsignificance-innature.html#lesson
 http://education-
portal.com/academy/le
sson/kinetic-energy-topotential-energyrelationship-indifferent-energytypes.html#transcript
Grab the large whiteboard +
markers
 Make a concept map of
forms of energy after
watching the video
clip. Put ENERGY in
the center and the
branches should be all
the energy forms you
are aware of
 Branch out more and
list any facts or draw
pix of other pertinent
info about each form of
energy.
 (By the time we are
done with this course
you will have at least
500 things to put in a
map like this!!) 
Something like this…
energy
You next problem:
 What determines the
period of a pendulum?
 1. the length of the
string?
 2. the mass of the
objects on the string?
 3. the height of
release?
•WHAT DID YOU
LEARN IN LAB?
How large do
you need a
mirror to be
to see your
entire
reflection?
WHAT DID YOU
LEARN IN LAB?
yes
no
Does it
matter how
far away you
are?
http://www.youtube.com/
watch?v=o6YaokJfP98
(1.5min)
Concave mirrors:
 http://cdac.olabs.co.in/?sub=74&brch=9&sim
=38&cnt=59
http://www.
youtube.com
/watch?v=VG
MnztltVh0
4:03
http://www.youtube.com/watch?v=oZPiyEZgc2s
Why is the sky blue? (1.5min)
http://www.youtube.com/watch?v=zEZ3_UIj0bc - jfl
Red light
http://ww
w.youtube
.com/watc
h?v=EHMH0
uQDEOU&fe
ature=rel
ated
What is the inside color of a
rainbow?
Why?
…when the white light is
When white light enters a prism, violet is refracted at
a smaller angle than red light because it isn’t ‘as
strong’.
Rainbows:
the same thing basically happens
when it enters a raindroplet
Conspiracy of rainbows: http://www.youtube.com/watch?v=_c6HsiixFS8 (2min)
Refraction
refraction: bending of light as it
passes from 1 medium/substance to another
light travels slower in water, so
it bends more toward the ‘normal’
Refraction-Given
that light travels
slower in water than
air…
Refraction
http://www.youtube.com/
watch?v=5Rmh2die2fM
(1min Dive Fishing)
what/where you see it
actual image
However, what is too much sun?
What Causes Skin
Cancer?
-95% of UV reaching Earth
–less intense but 30-50 x more common
-equal intensity all daylight hr/year
-can penetrate clouds and glass.
-causes skin reddening and sunburn on
outer layer
-intensity varies by season/location/
time of day (10AM - 4PM April to Oct).
-UVB rays can burn/damage year-round,
especially at high altitudes & on
reflective surfaces such as snow or ice
Asymmetry: Not matching halves,
different
shapes
Border: Often uneven; may have
scalloped or notched edges.
Color: Common moles are a single
shade of brown, should not change
color
8
0
16581934
Diameter:
¼” diameter
(size of a pencil eraser)
16581934
16581934
8
0
8
0
16581934
1. A. winter
2. B. Spring or
D. fall
3. c. summer
 http://www.acoustics.salford.ac.uk/schools/te
acher/lesson3/flash/whiteboardcomplete.swf
 Animation on reflection, refraction,
diffraction
 Best clipart:
 http://www.picgifs.com/graphics/