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written by
Gary Gladding
published by the University of llinois Physics Education Research Group
This interactive homework problem presents an object with three forces acting on it. Learners must find the magnitude of the net force with the information given. The author provides explicit help with correct placement of the vectors to calculate net force, then leads them interactively through the calculations without spoon-feeding. Immediate feedback is received for both correct and incorrect responses. This resource is part of a larger collection of interactive homework problems for introductory physics. See Related Materials for a link to the full collection.
This resource is part of a Physics Front Topical Unit.
Topic: Dynamics: Forces and Motion
Unit Title: Newton's Second Law & Net Force This interactive homework problem presents an object with 3 forces acting on it. Learners must find the magnitude of the net force with the information given. The author provides explicit help with correct placement of the vectors to calculate net force, then leads them interactively through the calculations. Immediate feedback is received for both correct and incorrect responses. This problem incorporates principles of PER (Physics Education Research). Link to Unit:
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![]() <a href="https://www.compadre.org/precollege/items/detail.cfm?ID=6401">Gladding, Gary. Illinois PER Interactive Examples: Forces. Urbana: University of llinois Physics Education Research Group, August 30, 2014.</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/03/ie_forces).
![]() G. Gladding, Illinois PER Interactive Examples: Forces (University of llinois Physics Education Research Group, Urbana, 2006), <https://ie.per.physics.illinois.edu/per/ie/ie.pl?phys111/ie/03/ie_forces>.
![]() Gladding, G. (2014, August 30). Illinois PER Interactive Examples: Forces. Retrieved March 26, 2025, from University of llinois Physics Education Research Group: https://ie.per.physics.illinois.edu/per/ie/ie.pl?phys111/ie/03/ie_forces
![]() Gladding, Gary. Illinois PER Interactive Examples: Forces. Urbana: University of llinois Physics Education Research Group, August 30, 2014. https://ie.per.physics.illinois.edu/per/ie/ie.pl?phys111/ie/03/ie_forces (accessed 26 March 2025).
![]() Gladding, Gary. Illinois PER Interactive Examples: Forces. Urbana: University of llinois Physics Education Research Group, 2006. 30 Aug. 2014. 26 Mar. 2025 <https://ie.per.physics.illinois.edu/per/ie/ie.pl?phys111/ie/03/ie_forces>.
![]() @misc{
Author = "Gary Gladding",
Title = {Illinois PER Interactive Examples: Forces},
Publisher = {University of llinois Physics Education Research Group},
Volume = {2025},
Number = {26 March 2025},
Month = {August 30, 2014},
Year = {2006}
}
![]() %A Gary Gladding %T Illinois PER Interactive Examples: Forces %D August 30, 2014 %I University of llinois Physics Education Research Group %C Urbana %U https://ie.per.physics.illinois.edu/per/ie/ie.pl?phys111/ie/03/ie_forces %O text/html ![]() %0 Electronic Source %A Gladding, Gary %D August 30, 2014 %T Illinois PER Interactive Examples: Forces %I University of llinois Physics Education Research Group %V 2025 %N 26 March 2025 %8 August 30, 2014 %9 text/html %U https://ie.per.physics.illinois.edu/per/ie/ie.pl?phys111/ie/03/ie_forces Disclaimer: ComPADRE offers citation styles as a guide only. We cannot offer interpretations about citations as this is an automated procedure. Please refer to the style manuals in the Citation Source Information area for clarifications.
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The AIP Style presented is based on information from the AIP Style Manual. The APA Style presented is based on information from APA Style.org: Electronic References. The Chicago Style presented is based on information from Examples of Chicago-Style Documentation. The MLA Style presented is based on information from the MLA FAQ. This resource is stored in 2 shared folders. You must login to access shared folders. Illinois PER Interactive Examples: Forces:
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