Foundations of Physical Science
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Transcript of Foundations of Physical Science
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Foundations of Physical Science
Workshop: Buoyancy
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Presenters Patsy DeCoster Director of Staff Development [email protected]
Scott Eddleman Manager of Curriculum Development [email protected]
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CPO Science Inquiry-based textbook programs
Foundations of Physical Science Foundations of Physical Science with Earth and Space
Science Introduction to Earth and Space Science Foundations of Physics COMING IN 2005: Chemistry
Supplemental hands-on equipment and curriculum for grades 6 – 12
Staff Development Graduate institutes Workshops Videos/DVDs
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Hands-on Equipment
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Key Questions Why don’t boats
made of steel SINK?
Is it possible for a material that is MORE DENSE than water to float?
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Overview Use clay instead of steel
Make measurements and observations of clay stick
Build a clay boat
Make measurements and observations of clay boat
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Set up your work area Use wax paper to cover work area
Web participants that registered in advance received a materials list, those of you that are here with me have all the materials you need at your table. There is enough clay for each person to build his/her own boat, but we will share non-consumables such as graduated cylinders.
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Find volume of clay stick in cubic cm, mass in grams, and then calculate density. (see data summary next slide)
Will the clay sink or float?
Test your hypothesis. Place clay stick in container of water to see if it floats or sinks. Remove clay quickly and dry it off!
Does Clay Sink or Float?
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Length (cm)__________
Width (cm)___________
Height (cm)__________
Volume (cm3)__________
Mass (g)______________
Density (g/cm3)___________
SINK OR FLOAT?
Clay Stick
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Questions?
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Place clay stick carefully into displacement tank. Be sure a dry beaker is under the overflow spout!
Use the graduated cylinder to measure the volume of water displaced.
How does the volume of displaced water compare to first volume measurement of clay stick?
Volume of clay stick in mL
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Discussion/Questions
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Find mass of displaced water. How does this value compare to the volume?
Now calculate the WEIGHT of displaced water. (why calculate weight? Because we want to look at FORCES involved with floating and sinking)
Calculate the weight of the stick of clay
Floating and Sinking and Forces…
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Volume of displaced water (ml)__________
Mass of displaced water (g)_________
Weight of displaced water (N)________
(gramsX0.0098N/g = N)
Weight of clay stick (N)_____________
Clay Stick
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Clay Stick Data SummaryWeight (N) of object
Volume (mL) of displaced water
Weight (N) of displaced water
Stick of Clay
0.58 N 36.0 mL 0.35 N
Clay Boat
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Make a Boat! Use the entire stick of clay to mold the clay
into a shape that will float. You will be putting the boat in the displacement tank, so be sure that it fits properly.
PREDICT: How will weight of boat, volume of displaced water, and weight of displaced water compare to the data for the clay stick?
Use the displacement tank to find out how much water the boat displaces
Find the weight of the displaced water
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Conclusions Study the data. What relationships can
you see among the measured values?
Weight (N) of clay
Volume (mL) of displaced water
Weight (N) of displaced water
Stick of Clay
0.58 N 36.0 mL 0.35 N
Clay Boat 0.58 N 60.0 mL 0.58 N
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