So for this lab, we're going to need several
materials: a light bulb -- 150 watt light
bulb, and a socket. You can use either the
frosted or the unfrosted light bulbs.
We're going to need two different clamps that look like
this. To set those up really quick here...
...that screws on like that.
And we can set our light bulb up too
while we do that.
So we'll leave the light bulb set up
like that for just a second. We're going to
need a flexible temperature probe, our
LabQuest device, a half-meter stick, tape....
...we're going to need a fan, and our globe. Set
up -- the initial setup since we have our
light bulb set up I would like your light
bulb to be horizontal like this so if
it's tilting at some certain angle try
to make that as straight as possible.
The first experiment that we're going to do is
a northern winter, so part one of this
lab is a northern winter. So for northern
winter, our Earth's axis as we may have
already read in the topic iBook is
at a 23.5 degree tilt.
So the Earth isn't straight up and down
it's tilted relative to the Sun at
23.5 degrees. And so
when we have northern winter the North
Pole is actually tilted away from the
Sun in this experiment our light bulb is
going to be the Sun and we want for the
first part our northern hemisphere to be
tilted away from the light bulb. The next
thing we're going to do is we're going
to find Farmington, Minnesota on the
globe here. I would look for Minneapolis
because Farmington is obviously not
going to be on a globe like this. So I'll
go just a little bit south of
Minneapolis I'll put the tip of this
flexible temperature probe on here...
...and I'm just gonna tape it to
Minneapolis. Just for a little bit of a
close-up on what this is gonna look like
as I said just a little bit south of
Minneapolis -- you want to make sure that
the whole tip of this probe is exposed
you don't want to cover that up with
tape otherwise your numbers gonna be off,
and your graph is probably gonna look a
little strange. And like I said tilt the
globe away for the northern hemisphere
the one last thing that we need to do is
we need to adjust the light bulb. So
we'll do that right now.
Because in the winter as we may have
seen in our iBooks already the most
vertical, um, southernly
raised sun rays on the winter solstice
don't line up up here in the northern
hemisphere they actually align down here
in the southern hemisphere. On the winter
solstice so the beginning of winter the
most vertical direct rays of sunlight
actually line up with the Tropic of
Capricorn south of the Equator so I'm
gonna line my light up so that it's
roughly aligned with the Tropic of
Capricorn. Which looks good and the very
last thing that we need to do is we need
the distance between our Sun and our
temperature probe here to be 25
centimeters. So, using a half-meter stick
we can measure that out.
 
Okay, so once we've allowed the fan to
run for a little bit and we think our
flexible temperature probe is going to
read an appropriate temperature, we're
going plug in that flexible temperature
probe into channel 1 of our LabQuest
device. For both the northern winter and
the northern summer experiments we're
going to be running a time-based LabQuest
trial. Our rate is going to be 0.5
samples per second. And our duration is
going to be 10 minutes so 600 seconds --
600 seconds. So 0.5 samples per second at
600 seconds. Looks good, and so actually
once this is all set up we should be
able to start the first run. I'm going to
hit play
and as soon as I hit play as soon as I
can I'm gonna turn on the light bulb -- had
to plug it in first. And we're gonna let
that run for about ten minutes. After ten
minutes I'm going to turn off the light. If
you set it to 10 minutes properly your
LabQuest should look something like that.
So I ran for the whole time from 0 to
600, um,  looks like it went up a little less
than a degree. Which kind of makes sense
because the probe is pointed away from
our light source. We're gonna see how
that compares to the summer temperature
in the next experiment.
Since we're satisfied with what we have for our
first part our northern winter, we're
going to start our next experiment the
northern summer the first thing we're
gonna do is we're gonna hit this filing
cabinet icon this is gonna store our
initial graph, and create a Run 2. So you
do not do not start a new graph
otherwise you're gonna lose that when we
connect that to Graphical Analysis.
So make sure -- file cabinet (button) -- you're going to have
a second run and the time constraints
should be the same. So everything should
be the same we should be ready now on
the LabQuest to run the next experiment.
But first we're actually going to have to
setup our northern summer. So this is
gonna be for part two -- our northern summer.
What I want you to do first since
we were just heating this up -- to keep a
consistent temperature we're gonna run
the fan for a little bit.
So let the fan run for a little bit to
cool off that temperature before...
...before we move anything around.
Alright, so I let my fan run for a while so that
I could cool off my flexible temperature
probe the next thing that we're gonna do
then is set up the globe for our
Northern Hemisphere summer. So, like we
had the North Pole tilted away for our
Northern Hemisphere winter in the summer,
the globe is actually gonna be tilted...
...towards the Sun.
So our globe -- I'm just
gonna readjust the flexible temperature probe really quick,
but the tip of
our globe should be pointed now towards our light bulb.
So again, should be pretty close to just
a little bit south of Minneapolis,
make sure that the temperature probe is exposed at the top, at the tip --
that's where we actually get our temperature
readings from. So we're almost set up for
Northern Hemisphere summer. The last
thing we have to do is re-align our light bulb.
So, looks like my light bulb is
still nice and horizontal, but now that
my North Pole is tilted towards the
globe indicating that we're in the
summer months the most direct
vertical sunrays are actually going to
be over the Tropic of Cancer now. So I
have this still aligned with what was
the Tropic of Capricorn. I'm gonna find
on my globe the Tropic of Cancer
So it looks like I have to raise my light bulb
up just a little bit, so that it's
aligned with the Tropic of Cancer for
this experiment.
And then, I still want it to be 25
centimeters away from the probe to the
light bulb so I'm gonna adjust this just
a little bit -- so that it's closer.
And again just make sure as best as you can
reasonably do this light bulb should be
lined up with the Tropic of Cancer for
this experiment.
So, this setup looks pretty good to me
make sure that your axis here isn't
covering up your flexible temperature
probe. This (black tip of probe) shouldn't be under this (the tape),
otherwise your numbers are gonna be off.
If we go back to our LabQuest device...
...again make sure you're in Run 2, 
 this should keep your first trial temperature.
And I'm gonna push
play on this (LabQuest) and get my light bulb turned on.
And we're gonna let this run
for another ten minutes so this will be
our summer trial, um, so part two -- northern
summer.
All right, after this last ten minutes I'm going to turn off my light bulb.
And you know, when you take this down
make sure not to touch the light bulb, that'll hurt.
Let's look at our data.
So, the data looks really good, oh my gosh -- that's a huge temperature change,
over such a short period of time -- only 10 minutes.
So that looks great! So if we
want to view our runs together I'm going to
click on Run 2 -- and go to all runs (button) -- so we
can see our two plots together.
So Run 1, our winter plot vs. Run 2 -- that's a
pretty big difference.
And so at that point we can connect to our LabQuest
device.
Okay so I'm going to go into Graphical Analysis.
New experiment (button) -- data sharing (button)...
...and again just like the Practice Lab if we open up
our QR code (pausing to take picture)...
...take a picture of that QR code -- hit connect (button).
You should see both runs of your data. If
you need to it's possible that one of
these (graphs) just became unchecked make sure
that both of them are checked.
So you can either upload that or take a screenshot.
This is the picture on your Graphical Analysis that I want to see on your lab write-up.
Before you finish up your write-up, make sure that you put away all
your supplies.
Give some time for that light bulb to cool off.
Hey! Would you look at that -- thanks to Professor Rex
that cleanup barely took any time at all.
As always, if you have any questions with
the lab procedure or any of the lab
questions on the lab worksheet,
please let me know.
This was our Seasons Lab.
