The Turn of the Screw *
AbstractHow much force is required to advance a lag bolt (large wood screw with a hex-shaped head) into a piece of wood? You can measure the force by using a spring scale attached to the handle of ratchet. Pull on the spring scale until the bolt starts to turn, and note the required force from the spring scale. There are many potential experiments you could try. Think about answering the following questions: How does the force change as the bolt advances deeper into the wood? Why? How does the required force change as the diameter of the pilot hole is changed? Why? Can you change the required force by rubbing the bolt's threads with soap or wax? (Coyle, 2005)
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Last edit date: 2017-07-28
BibliographyCoyle, C.P., 2005. "Some Variables Affecting the Torque Required to Turn a Screw," California State Science Fair Project Abstract [accessed April 18, 2006] http://cssf.usc.edu/History/2005/Projects/J0205.pdf.
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