Weston Middle School

Technology/Engineering Course Materials

Weston, Massachusetts
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Grade 7 Design-Construction

 Building Big Forces Mini-Activities Links

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Class Notes



Additional Material


Mini-Activities-to Do in Pairs:

Extra time:

  • Determining tensile strength:
    • Suspend a concrete cinder block from the ceiling with a cable made up of 7 thin cotton strings tied together. Have students one by one cut the strings until the block crashes to the floor. Discuss how many strings are needed to hold the block to have a 100% safety margin.


Revised April 2007 by Jonathan Dietz, dietzj@mail.weston.org