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The Turn of the Screw *

Difficulty
Time Required Short (2-5 days)
*Note: This is an abbreviated Project Idea, without notes to start your background research, a specific list of materials, or a procedure for how to do the experiment. You can identify abbreviated Project Ideas by the asterisk at the end of the title. If you want a Project Idea with full instructions, please pick one without an asterisk.

Abstract

How 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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MLA Style

Science Buddies Staff. "The Turn of the Screw" Science Buddies. Science Buddies, 20 June 2014. Web. 1 Aug. 2014 <http://www.sciencebuddies.org/science-fair-projects/project_ideas/ApMech_p032.shtml>

APA Style

Science Buddies Staff. (2014, June 20). The Turn of the Screw. Retrieved August 1, 2014 from http://www.sciencebuddies.org/science-fair-projects/project_ideas/ApMech_p032.shtml

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Last edit date: 2014-06-20

Bibliography

Coyle, C.P., 2005. "Some Variables Affecting the Torque Required to Turn a Screw," California State Science Fair Project Abstract [accessed April 18, 2006] http://www.usc.edu/CSSF/History/2005/Projects/J0205.pdf.

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