written by
Gary Gladding
published by
the University of llinois Physics Education Research Group
This interactive homework problem involves a small ball suspended by a string in a uniform, horizontal electric field of known magnitude. Presuming the ball is in equilibrium when the string makes a 30 ° angle with the vertical, students must determine the net charge on the ball.
This problem is accompanied by a Socratic-dialog "help" sequence designed to encourage critical thinking as students do a guided conceptual analysis before attempting the mathematics. Immediate feedback for both correct and incorrect responses is provided through each step of the problem-solving. This item is part of a larger collection of interactive problems developed by the Illinois Physics Education Research Group. See Related Materials on this page for a link to the full collection.
<a href="https://www.compadre.org/introphys/items/detail.cfm?ID=6450">Gladding, Gary. Illinois PER Interactive Examples: Pendulum. Urbana: University of llinois Physics Education Research Group, June 16, 2006.</a>
G. Gladding, (University of llinois Physics Education Research Group, Urbana, 2002), WWW Document, (https://per.physics.illinois.edu/per/IE/ie.pl?phys102/ie/01/p5new).
G. Gladding, Illinois PER Interactive Examples: Pendulum (University of llinois Physics Education Research Group, Urbana, 2002), <https://per.physics.illinois.edu/per/IE/ie.pl?phys102/ie/01/p5new>.
Gladding, G. (2006, June 16). Illinois PER Interactive Examples: Pendulum. Retrieved January 13, 2025, from University of llinois Physics Education Research Group: https://per.physics.illinois.edu/per/IE/ie.pl?phys102/ie/01/p5new
Gladding, Gary. Illinois PER Interactive Examples: Pendulum. Urbana: University of llinois Physics Education Research Group, June 16, 2006. https://per.physics.illinois.edu/per/IE/ie.pl?phys102/ie/01/p5new (accessed 13 January 2025).
Gladding, Gary. Illinois PER Interactive Examples: Pendulum. Urbana: University of llinois Physics Education Research Group, 2002. 16 June 2006. 13 Jan. 2025 <https://per.physics.illinois.edu/per/IE/ie.pl?phys102/ie/01/p5new>.
%A Gary Gladding %T Illinois PER Interactive Examples: Pendulum %D June 16, 2006 %I University of llinois Physics Education Research Group %C Urbana %U https://per.physics.illinois.edu/per/IE/ie.pl?phys102/ie/01/p5new %O text/html
%0 Electronic Source %A Gladding, Gary %D June 16, 2006 %T Illinois PER Interactive Examples: Pendulum %I University of llinois Physics Education Research Group %V 2025 %N 13 January 2025 %8 June 16, 2006 %9 text/html %U https://per.physics.illinois.edu/per/IE/ie.pl?phys102/ie/01/p5new
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This is a link to the full collection of interactive homework problems by the same author. Complete problem sets are available for both algebra-based and calculus-based courses in introductory physics.
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