# “That Sinking Feeling”

Document Sample

```					“That Sinking Feeling”
Day 1
The Crow and the Pitcher
Once there was a terribly thirsty crow. She had not
had a drink of water in days and knew that she
would soon perish if she didn’t find water.
Suddenly, to her delight, she spotted a pitcher
setting on a table beside a pebbled path. Thrilled
by the discovery, the crow flew to the table.
When the crow reached the pitcher, she
discovered to her grief that the water level was
too low and the neck of the pitcher was too
narrow. No matter how hard the crow tried to
squeeze her head into the pitcher, she could not
reach the water with her beak.
So, the crow tried to overturn the pitcher, hoping
that the water would spill and then she could
drink it. However, no matter how hard she tried,
the pitcher was too heavy for the crow to move.
Just as the crow was about to give up, she noticed
the pebbles on the ground. An idea suddenly
came to her. She picked up the pebbles one by
one and dropped them into the pitcher.
Each time she dropped a pebble into the pitcher,
the water level would rise. Eventually, the water
level was high enough for the crow to drink the
water and save her life.
If you remember, buoyancy is the ability of
an object to float or rise in a liquid or gas.
How was the crow able to cause the water
to rise so that she could get a drink?
Now lets watch a short piece from a video
that describes what buoyancy is-

Lets watch the following video on buoyancy:
http://dsc.discovery.com/videos/mythbusters
-lets-talk-buoyancy.html
“That Sinking Feeling” Day 1

Date That Sinking Feeling
Day 1
Instructions for today’s lab:
1. Fill in your lab journal      Materials:
•3 cubes
with the correct
•1 triple beam balance
information
2. Make a data table in your
journal similar to the one   CUBE       Predicted     Measured
here                                    Mass          Mass

3. Predict the mass of each
cube. Record your
1