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Summary

Areas of Science
Difficulty
 
Time Required
Short (2-5 days)
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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)

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://cssf.usc.edu/History/2005/Projects/J0205.pdf.
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General citation information is provided here. Be sure to check the formatting, including capitalization, for the method you are using and update your citation, as needed.

MLA Style

Science Buddies Staff. "The Turn of the Screw." Science Buddies, 7 May 2021, https://www.sciencebuddies.org/science-fair-projects/project-ideas/ApMech_p032/mechanical-engineering/turn-of-the-screw. Accessed 20 May 2022.

APA Style

Science Buddies Staff. (2021, May 7). The Turn of the Screw. Retrieved from https://www.sciencebuddies.org/science-fair-projects/project-ideas/ApMech_p032/mechanical-engineering/turn-of-the-screw


Last edit date: 2021-05-07
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