Transcript Sink and Swim

Sink and Swim
Ms. Scillieri
Memorial School
6th Grade Science
Misconceptions
• A lot of people believe that
objects float in WATER because of
mass. Just being heavy or light
Density
• Scenario:
• A tree trunk falls during a storm
and ends up in the ocean it
FLOATS, even though it has a
mass of hundreds of pounds.
• This is because of density
• I know you must be saying
• “Density what is that?!”
Let’s Think About It
• A block of wood cut into a cube
It is 10 centimeters long on each
side and has a weight of 500
grams
Now think about a block of gold cut
into the same cube with 10
centimeters on a side
What will have more mass the gold
or wood?
Conclusion
• The block of gold has a mass of 11,000
grams. The wood only 500 grams
• The two cubes are the same size, or
take up the same amount of space
VOLUME, but there is more mass in
gold than wood. Making it more dense
So….
• Density is a comparison of how
much mass there is in a certain
amount of space. ( OR VOLUME)
Which one is more dense
• Let’s pretend it is people in a
room
Now which one?
• Grams
• LxWxH
• Centimeters
cubed OR
CM 3
Density
• Has
weight
and
takes up
space
Volume
Mass
Units of Density
• Mass ÷
Volume
• Grams ÷
CM 3
Solving for Density
• Formula:
Mass/Volume
• Units: Grams and
Centimeters3
• Practice Problem:
• If your notebook has
a mass of 500 grams
and a volume of 40
centimeters cubed
what is the density
• Step One: Write
Formula
• Step Two : Find
Mass and Volume
• Step Three: Plug
into Formula
• Step Four Solve
Practice Problem
•
•
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•
Density= Mass/Volume
Mass= 500 grams
Volume= 40 centimeters cubed
Density= 500grams/40 cms3
Density = 10 grams/cm3
• Questions???
• Don’t worry we will practice this
A LOT MORE ON WEDNESDAY!!
Big Ideas
• ONE BIG IDEA BEHIND WHY SOME
THINGS FLOAT IN WATER OR ANY
OTHER LIQUID
• If it is LESS DENSE THAN THE LIQUID
it FLOATS
• If it is MORE DENSE THAN THE LIQUID
it SINKS
• The density for water is 1.0 g/cm3
What will sink and what
will float in water?
Material
Density
A piece of wood
0.5 g/cm
A piece of wax
0.9 g/cm
A piece of copper
9.0 g/cm
Density of Irregular
Shaped Objects
• Would be able to measure LENGTH, WIDTH,
and HEIGHT of something like a jagged
pebble, a ball, or a toy car?
• How would you go about finding density?
(Hint use water, think about what happens
when you get into a pool or bathtub)
Let’s Take A Look
• Step One: Write the formula
• Step Two: Find the mass of the irregular
shaped object . How?
• Step Three: Fill a beaker with water in mL.
• Drop the item in the water submerging it or
covering it. difference in water is the volume.
• Now how would we finish solving
Let’s Experiment
Liquid Layers
What do you think will happen if we
pour corn syrup, vegetable oil,
and water one by one in a clear
container?
Liquid Layers Lab
• Break up into your lab groups quickly and quietly!
• Let’s chat and come up with a hypothesis
• On the back supply table each group has a clear
beaker, 200mL of water colored blue, 200 ml of corn
syrup, and 200 mL vegetable oil.
• Carefully send 2 people over and take your beaker and
fluids
• When I say go we will pour each fluid in one at a time
and in the end we get something that…
Lab Questions
• What is the formula for density?
• What is the density of water?
• What happens if you pour together liquids
that have different densities?
• Will the liquid on the top have the highest or
lowest density?
• Will the liquid on the bottom have the highest
or lowest density?
Looks like this!!!
HOMEWORK
1. How would you
define density?
2. What is the
formula and units
for density
SUPER SCIENCE
QUESTION!!!!
If Hunter and
Samantha have a
book, a scale, and a
ruler how would
they be able to find
density?