1. Foundations of Physical Science Workshop: Buoyancy

2. Presenters  Patsy DeCoster  Director of Staff Development  patsy@cpo.com  Scott Eddleman  Manager of Curriculum Development  scott@cpo.com

3. 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

4. Hands-on Equipment

5. www.cpo.com www.cpo.com 800-932-5227

6. Key Questions  Why don’t boats made of steel SINK?  Is it possible for a material that is MORE DENSE than water to float?

7. Overview  Use clay instead of steel  Make measurements and observations of clay stick  Build a clay boat  Make measurements and observations of clay boat

8. 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.

9.  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?

10.  Length (cm)__________  Width (cm)___________  Height (cm)__________  Volume (cm 3 )__________  Mass (g)______________  Density (g/cm 3 )___________ SINK OR FLOAT? Clay Stick

11. Questions?

12.  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

13. Discussion/Questions

14.  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…

15.  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

16. Clay Stick Data Summary Weight (N) of object Volume (mL) of displaced water Weight (N) of displaced water Stick of Clay 0.58 N36.0 mL0.35 N Clay Boat

17. 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

18. 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 N36.0 mL0.35 N Clay Boat0.58 N60.0 mL0.58 N

19. Thank You! www.cpo.com www.cpo.com 800-932-5227