Big Lump 'O' Clay  
Author(s): Craig Didden & Jim Schwagle 
Discrepant Event  Teacher's Guide SED 695B; Fall 2005  
In this activity students are asked the
question does the size of an object affect its density? I use clay because
it is
easily manipulated, and the students can make all different sizes of
balls to test their hypothesis. Make sure that you go over the formula
for finding the density of an object, Density=Mass/Volume. Also it is
important that students understand how to find the volume of an irregular
shaped object.  
Principles ilustrated


Standards Density and Buoyancy
 
Questioning Script Prior knowledge & experience:
Root question:
Target response: Common Misconceptions:


These are the results of measuring the mass and volume of one half of the clay ball.  

These are teh results of measuring the other half of the clay ball.  

These are the results of measuring th ewhole ball of clay.  
Study Questions 1. How do you determine the volume of an irregular shaped object? 2. How do you determine the volume of an object with equal sides? 3. What is the equation for detemining the density of an object? 4. Explain the water displacement method of finding density. 5. What are some problems with using a triple beam balance to determine the mass of an object? 6. 

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