Home School Life Journal

Home School Life Journal ........... painting by Katie Bergenholtz
"Let us strive to make each moment beautiful."
Saint Francis DeSales

Building Big: Tug-Push-Twist

My boys learned many factors that affect buildings in a hands-on way. They experienced compression by teams pushing their hands against each other's; tension by pulling against each other's curved fingers and torsion by hold each other's wrists with hands and twisting in opposite directions.


Then we started testing materials for these three qualities. The materials were all household items (such as cloth, aluminum foil, clay, a rubber band and a drinking straw) that the boys had found the day before by way of a scavenger hunt.



Sometimes it was hard to decide how to rank the different materials in terms of tension, compression and torsion, but we did make a chart of the results of our testing, ranking the items from 1 (weak) to 4 (strong) in the different areas. We will use this information when we later build various structures.



If you would like to see more, go to PBS for Educators.

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