written by
Gary Gladding
published by
the University of llinois Physics Education Research Group
This is an interactive homework problem for introductory physics students relating to uniform circular motion. Two rocks of known mass are tied at opposite ends of a .19m string. A second string measuring .14m is tied to one rock. The pair of rocks is then spun in a circle. Students must determine the tension of the string connected to the rock closest to the center of the circle.
A user-activated "help" sequence is provided for each step of the problem-solving, including conceptual analysis and quantitative calculations. Immediate feedback is received for both correct and incorrect responses. This item is part of a larger collection of interactive homework problems for introductory physics. See Related items on this page for a link to the full collection.
<a href="https://www.compadre.org/introphys/items/detail.cfm?ID=6410">Gladding, Gary. Illinois PER Interactive Examples: Two Rocks on a String. Urbana: University of llinois Physics Education Research Group, June 16, 2006.</a>
G. Gladding, (University of llinois Physics Education Research Group, Urbana, 2006), WWW Document, (https://ie.per.physics.illinois.edu/per/ie/ie.pl?phys111/ie/04/ie_tworocks_string).
G. Gladding, Illinois PER Interactive Examples: Two Rocks on a String (University of llinois Physics Education Research Group, Urbana, 2006), <https://ie.per.physics.illinois.edu/per/ie/ie.pl?phys111/ie/04/ie_tworocks_string>.
Gladding, G. (2006, June 16). Illinois PER Interactive Examples: Two Rocks on a String. Retrieved April 30, 2025, from University of llinois Physics Education Research Group: https://ie.per.physics.illinois.edu/per/ie/ie.pl?phys111/ie/04/ie_tworocks_string
Gladding, Gary. Illinois PER Interactive Examples: Two Rocks on a String. Urbana: University of llinois Physics Education Research Group, June 16, 2006. https://ie.per.physics.illinois.edu/per/ie/ie.pl?phys111/ie/04/ie_tworocks_string (accessed 30 April 2025).
Gladding, Gary. Illinois PER Interactive Examples: Two Rocks on a String. Urbana: University of llinois Physics Education Research Group, 2006. 16 June 2006. 30 Apr. 2025 <https://ie.per.physics.illinois.edu/per/ie/ie.pl?phys111/ie/04/ie_tworocks_string>.
@misc{
Author = "Gary Gladding",
Title = {Illinois PER Interactive Examples: Two Rocks on a String},
Publisher = {University of llinois Physics Education Research Group},
Volume = {2025},
Number = {30 April 2025},
Month = {June 16, 2006},
Year = {2006}
}
%A Gary Gladding %T Illinois PER Interactive Examples: Two Rocks on a String %D June 16, 2006 %I University of llinois Physics Education Research Group %C Urbana %U https://ie.per.physics.illinois.edu/per/ie/ie.pl?phys111/ie/04/ie_tworocks_string %O text/html
%0 Electronic Source %A Gladding, Gary %D June 16, 2006 %T Illinois PER Interactive Examples: Two Rocks on a String %I University of llinois Physics Education Research Group %V 2025 %N 30 April 2025 %8 June 16, 2006 %9 text/html %U https://ie.per.physics.illinois.edu/per/ie/ie.pl?phys111/ie/04/ie_tworocks_string
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