Problem 3: Ring on the Rod

“A washer on a vertical steel rod may start spinning instead of simply sliding down. Study the motion of the washer and investigate what determines the terminal velocity.”

I. Phenomenon Demonstration

• A Washer Falls Down Threaded Rod https://www.reddit.com/r/oddlysatisfying/comments/iwsjh7/a_washer_falls_down_threaded_rod/

• DANCING WASHERS – ENGLISH – 19MB by Arvind Gupta https://youtu.be/hHtkJzOU2bo 

• IYPT ring on the rod demonstration by Aradyha Jain. https://www.youtube.com/watch?v=IVJiNpXZI4M
• Washer on a threaded rod by GEORGE ZARIFIS: https://youtu.be/oD6yxsCkkpg
• Кольцо на стержне / Ring on the rod / IYPT 2022 by Андрей Щетников. https://www.youtube.com/watch?v=jce_Jya1lZ8

II. Books, Encyclopedia, Discussion and Forum Posts

• Vibrational Detachment of Threaded Fasteners https://www.boltscience.com/pages/VibrationalDetachmentOfFasteners.htm  

III. Research Paper

• Cross, Rod. “Rotating Ring on a Vertical Rod.” Physics Education 56, no. 2 (2021): 023003. https://doi.org/10.1088/1361-6552/abd992. https://iypt.ru/wp-content/uploads/2021/09/Rotating-ring-on-a–vertical.pdf
• Jirandehi, Arash P, and Tajbakhsh N Chakherlou. “A Profound Study on the Effects of Friction Coefficient on …” Research Gate, September 2015. https://www.researchgate.net/publication/294874446_A_profound_study_on_the_effects_of_friction_coefficient_on_torque_tightened_longitudinally_loaded_bolted_connections.