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Table of Contents- CONT.
LEFT SIDE
PG
RIGHT SIDE
Table of Contents
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
Section Review4.2
50
Buoyancy Eureka 49
Buoyancy WS
51
Film Can Conclusion 52 Sinking Film Can 53
The Soda Can
4
54 Film Can Challenge 55
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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
PVC: D = Mass/Volume
Lead
___cm3
= ___g/
= ____g/cm3
Aluminum D = M/V
Brass
= ___g/ ___cm3
= ____g/cm3
Pine
Acrylic
Oak
40
D = M/V
= ___g/ ___cm3
= ____g/cm3
D = M/V
= ___g/ ___cm3
= ____g/cm3
D = M/V
= ___g/ ___cm3
= ____g/cm3
Copper D = M/V
D = M/V
= ___g/ ___cm3
= ____g/cm3
Steel
D = M/V
= ___g/ ___cm3
= ____g/cm3
Nylon: D= M/V
= 18.5g/ 15.625cm3
= 1.184 g/cm3
= ___g/ ___cm3
= ____g/cm3
D = M/V
= ___g/ ___cm3
= ____g/cm3
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
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:
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VOLUME: Regular shaped solid
FORMULA: Volume = L x W x H
= __ cm x __ cm x __ cm
=
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1.
2.
3.
4.
5.
6.
Describe the objects- color, etc
Measure Mass with scale in grams.
Use the displacement method to find the volume in mL.
Graph your data on graph paper. Draw trend line.
Calculate the item’s density in g/mL.*** (slope of lineaverage)
Use the chart to try to identify what the item is.
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.
Volume
Mass
Observations (color, texture, size, etc)
Volume
Mass
Observations (color, texture, size, etc)
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TIFF (LZW) decompressor
are needed to see this picture.
Copy graph on next page- tape it into
your notebook
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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)
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Example graph of densities- Page 42
Mass (grams)
Densities of Solids
45
40
35
30
25
20
15
10
5
0
-5 0
Red
Green
Silver
5
10
Volume (mL)
15
Densities of items in increasing order
0.64 g/ml
0.75 g/ml
0.77 g/ml
0.90 g/ml
0.92 g/ml
1.15 g/ml
1.17 g/ml
1.23 g/ml
1.32 g/ml
1.37 g/ml
1.42 g/ml
2.2 g/ml
2.7 g/ml
7.7 g/ml
7.9 g/ml
8.56 g/ml
8.91 g/ml
11.3 g/ml
Walnut
Oak
Maple
Polypropylene
LDPE (polyethylene)
Nylon
Acrylic
Polyurethane
Phenolic
PVC (Polyvinylchloride)
Acetyl
Teflon
Aluminum
Steel
Iron
Brass
Copper
Lead
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Definition and units to use: (page 78)
Amount of water
INSTRUCTION MANUAL-
To find the volume of: (List steps from p 78 to find the
volume of each)
1. LIQUIDS (p.78)
a.
b.
Qu i ck Ti m e ™ an d a
de co m pr e ss or
ar e n ee de d t o s ee t h is pi ct u re .
picture
2. REGULAR SHAPE SOLID
a.
b.
picture
c.
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3. DISPLACEMENT METHOD (illustrated) for irregular
Solids (use last two paragraphs on P78 to describe and draw the
four steps in displacement method.)
A. Fill the…
B. Slide the object…
picture
C. What happens?
picture
WILL DIFFERENT AMOUNTS OF A MATERIAL HAVE
DIFFERENT DENSITIES?
picture
D. How to get volume
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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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
1. Pennies
2. 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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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
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Page 48: The Egg Mystery
Page 49: Eureka Buoyancy Notes
Use 5 lines.
QuickTime™ and a
decompressor
are needed to see this picture.
Draw the egg/ beakers
Label at least 3 things
Observations
(what I see)
Inferences
(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.
Use 4 lines
ONLY
1.
2.
Vector:
page 48
An arrow that shows the
DIRECTION and
MAGNITUDE of a force
48
Small
force
Bigger
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 object’s volume in cm3.
b. Calculate the object’s 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.
50
Buoyancy Worksheet
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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
Why doesn’t 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
QuickTime™ and a
d eco mpres sor
are nee ded to s ee this picture.
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 Archimede’s principle apply to the film can?
Quic kTime™ and a
dec ompres sor
are needed to see t his pic ture.
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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?:
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 ver
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 shou
be about the same
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NB Page 54
The Film Can Challenge: 12/13/11
Archimedes Principle
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.
Canister
Mass of film
can (grams)
Volume of
water displaced
(mL)
Weight of water
displaced (grams)
Buoyant force
(grams)
SINKS
FLOATS
Suspended
in middle
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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