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• Table of Contents- CONT.

• Table of Contents

LEFT SIDE PG RIGHT SIDE PG
The Cubes Density 40 Density Intro 41
Graphing Density 42 Density of Solids 43
Volume Guide 44 Density of Water 45
Copper Penny Analysis 46 King Bling 47
Egg Mystery 48 Buoyancy Eureka 49
Section Review4.2 50 Buoyancy WS 51
Film Can Conclusion 52 Sinking Film Can 53
The Soda Can 54 Film Can Challenge 55
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• Leave blank for now

• Table of Contents

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Introduction to Density 11/7/11 Which weighs
more, a pound of feathers or a pound of bricks?
Explain. Data Table
Density calculation Density Mass/Volume
___g/ ___cm3 ____g/cm3 Calculate all
densities for cubes on other page using volume
found above. Round to nearest hundredth. Include
all units as shown in example
Item Observations Item Observations
PVC 26.2 g Lead 163.4 g
Aluminum 46.4 g Brass 137.0 g
Pine 11.5 g Copper 146.3 g
Acrylic 19.5 g Steel 126.2 g
Oak 8.9 g Nylon 18.5 g Nylon 18.5 g
PVC D Mass/Volume ___g/ ___cm3 ____g/cm3 Lead D M/V ___g/ ___cm3 ____g/cm3
Aluminum D M/V ___g/ ___cm3 ____g/cm3 Brass D M/V ___g/ ___cm3 ____g/cm3
Pine D M/V ___g/ ___cm3 ____g/cm3 Copper D M/V ___g/ ___cm3 ____g/cm3
Acrylic D M/V ___g/ ___cm3 ____g/cm3 Steel D M/V ___g/ ___cm3 ____g/cm3
Oak D M/V ___g/ ___cm3 ____g/cm3 Nylon D M/V 18.5g/ 15.625cm3 1.184 g/cm3
For each item, write three observations- one
qualitative and one quantitative. Under the
chart, make a list How they are similar
How they are different
THE CUBES The cubes are similar in and different
in VOLUME Regular shaped solid FORMULA
Volume L x W x H __ cm x __ cm x __ cm
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Density of Solids 11/9/11 Density describes how
much mass is in a given volume of a
material. Mass is measured by a scale in
grams. Volume can be measured by 2 techniques
A) Volume formula (l w h) Or B)
displacement.

1. Describe the objects- color, etc
2. Measure Mass with scale in grams.
3. Use the displacement method to find the volume in
   mL.
4. Graph your data on graph paper. Draw trend line.
5. Calculate the items density in g/mL. (slope
   of line- average)
6. Use the chart to try to identify what the item is.

Volume Mass Observations (color, texture, size, etc)




Volume Mass Observations (color, texture, size, etc)




Copy this under the charts. Use 6 lines Density
calculations 1. Density Mass/Volume
___g/ ___mL ____g/mL We think the
________ object is _____ (describe it)
because (use the chart to try to identify
the solids)
Copy graph on next page- tape it into your
notebook
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Example graph of densities- Page 42
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Densities of items in increasing order
0.64 g/ml Walnut 0.75 g/ml Oak 0.77
g/ml Maple 0.90 g/ml Polypropylene 0.92
g/ml LDPE (polyethylene) 1.15 g/ml Nylon 1.17
g/ml Acrylic 1.23 g/ml Polyurethane 1.32
g/ml Phenolic 1.37 g/ml PVC (Polyvinylchloride)
1.42 g/ml Acetyl 2.2 g/ml Teflon 2.7
g/ml Aluminum 7.7 g/ml Steel 7.9
g/ml Iron 8.56 g/ml Brass 8.91
g/ml Copper 11.3 g/ml Lead
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WILL DIFFERENT AMOUNTS OF A MATERIAL HAVE
DIFFERENT DENSITIES?
Amount of water Density (g/mL)
90 mL
80 mL
70 mL
60 mL
50mL
40 mL
30 mL
20 mL
100 mL
The density of the water is the same for each
group because.. Density is a ________.
As mass increases, volume ______, so when you
______ mass by volume, you get the _____ answer.
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King Bling and the Copper Caper Problem Are
pennies made of copper? My job skip 2
lines Plan Group decides how to solve the
problem using your knowledge of density. PLAN
must - be specific (HOW will you measure) be
accurate (how will you prove if the pennies are
copper) Data Include graduated cylinder
drawings record all data needed Data MUST
include- pictures to show how data was obtained
and ALL measurements made and information
collected DO NOT INCLUDE DENSITY CALCULATIONS
HERE

• Copper Density Analysis
• Calculations MUST include
• Show all math in calculating
• Comparisons to show if pennies are
• made of copper
• List formulas and make calculations for density
  of
• Pennies
• Copper (see NB 40)
• Analysis In a paragraph, give a logical answer
  to the problem Are the pennies copper?.
  Include your reasons and all quantitative data to
  support your analysis. Use your density of copper
  from NB pg 40 to solve the problem
• Must include
• - Are the pennies copper?
• - Supporting evidence
• - Recommendations for what King Bling should do.

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Page 49 Eureka Buoyancy Notes
Page 48 The Egg Mystery
Use 5 lines. Draw the egg/ beakers Label at least
3 things
Observations Inferences (what I see)
(what I think)
Use 5 lines. Discuss with your partner and record
observations and inferences Write at least 3 for
each
Write 2 questions you would like answered to help
you understand the phenomenon. 1. 2.
Use 4 lines ONLY
Vector page 48 An arrow that shows the
DIRECTION and MAGNITUDE of a force
Bigger force
Small force
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• Section Review 4.2 Page 87
• 1. The buoyant force on an object depends on the
  _______ of the object that is underwater.
• 2. What happens to the buoyant force on an object
  as it is lowered
• into water? Why?
• 3. The buoyant force on an object is equal to the
  weight of the water it ________________.
• 4. When the buoyant force on an object is greater
  than its weight, the object ___________.
• 5. A rectangular object is 10 centimeters long, 5
  centimeters high, and 20 centimeters wide. Its
  mass is 800 grams.
• a. Calculate the objects volume in cm3.
• b. Calculate the objects density in g/cm3.
• c. Will the object float or sink in water?
  Explain.
• 6. Solid iron has a density of 7.9 g/cm3. Liquid
  mercury has a density of 13.6 g/cm3. Will iron
  float or sink in mercury? Explain.
• 7. Why is it incorrect to say that heavy objects
  sink in water?
• 8. Steel is denser than water and yet steel ships
  float. Explain.

• Buoyancy Worksheet

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The Case of the Sinking Film Can
12/8/11 Archimedes Principle PREDICT Will an
object that sinks weight the same, less, or more
than its weight in air? __________________________
_____ EXPLAIN?
NB Page 52 12/9/11 The Case of the Sinking Film
Can Analysis and Conclusion 1. Calculate the
density of the film can Density
------------- D _____ g/ _____ mL D
_______ g/mL Density of water
_________ g/mL
1. Weight of the film can (in grams) from spring
scale ___ 2. Weight of the film can (in grams)
under water (not touching bottom) _____ 3. How
much less does the film can weigh under
water? This is the buoyant force __________
GRAMS Show subtraction _______ - ______
_____ 4. Volume of film can (use the
displacement can) Repeat the measurement until
you get answers that are very close ________ mL
______ mL _____mL 5. Weight of the
water displaced _________ 6. Write out
Archimedes Principle (Pg 83) ________________
__________________________________________________
__________________________________________________
________________________ 7. Use Archimedes
Principle to explain why the answer to 3 and 5
should be about the same
Why doesnt the film can float? 3. DENSITY OF
OBJECTS AND LIQUIDS EXPLANATION The film can
doesn_t float because..... Include Drawing of
film can (NO VECTORS) Measurements of mass and
volume with UNITS Calculation of density
Comparison of density of film can and liquid 4.
THE BUOYANT FORCE EXPLANATION The film can
doesn_t float because..... Include Drawing of
film can with vectors labeled with measurements
from lab (1, 2, 3) Buoyant force definition and
measurements with UNITS Weight definition and
measurement. How does Archimedes principle
apply to the film can?
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The Film Can Challenge 12/13/11 Archimedes
Principle
NB Page 54 12/12/11 The Soda Can PREDICTION
What will happen when we place a can of soda in
Lake Aguirre? _______ predicted that.
because. In your answer, include density,
mass, volume, buoyancy, weight, vector The
Soda Can Why does the regular soda sink and the
diet soda floats? In your answer, include
density, mass, volume, buoyancy, weight,
vector Draw a labeled picture- include vectors
for buoyant force and weight. (hint look at page
49)
The buoyant force on an object in water is equal
to the weight of the water displaced.
MY JOB __________________ Analysis and Results
(answer these questions with complete
sentences!!) 1. What is the mass of an empty film
canister? 2. Did the mass of the canister change
at all? Explain. 3. Did the volume of the film
canister change at all? Explain. 4. What caused
each canister to stay at their level in the
water? Explain what caused the canisters to
float, sink, or suspend using the term buoyancy.
ANSWER In WORDS AND DRAWINGS WITH LABELED
VECTORS DRAW FILM CAN, VECTORS LABELED WITH
WORDS MEASUREMENTS FROM LAB (How does the
buoyant force compare to the weight of the
displaced water?) Use the words BUOYANT FORCE,
DENSITY, WEIGHT, NET FORCE, FLOAT, SINK,
DISPLACED WATER
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