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written by
Kathryn E. Williamson, Edward E. Prather, and Shannon D. Willoughby
The study described here extends the applicability of the Newtonian Gravity Concept Inventory (NGCI) to college algebra-based physics classes, beyond the general education astronomy courses for which it was originally developed. The four conceptual domains probed by the NGCI (Directionality, Force Law, Independence of Other Forces, and Threshold) are well suited for investigating students' reasoning about gravity in both populations, making the NGCI a highly versatile instrument. Classical test theory statistical analysis with physics student responses pre-instruction (N?=?1,392) and post-instruction (N?=?929) from eight colleges and universities across the United States indicate that the NGCI is composed of items with appropriate difficulty and discrimination and is reliable for this population. Also, expert review and student interviews support the NGCI's validity for the physics population. Emergent similarities and differences in how physics students reason about gravity compared to astronomy students are discussed, as well as future directions for analyzing the instrument's item parameters across both populations.
American Journal of Physics: Volume 84, Issue 6, Pages 458-466
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![]() <a href="https://www.per-central.org/items/detail.cfm?ID=16040">Williamson, K, E. Prather, and S. Willoughby. "Applicability of the Newtonian gravity concept inventory to introductory college physics classes." Am. J. Phys. 84, no. 6, (May 23, 2016): 458-466.</a>
![]() K. Williamson, E. Prather, and S. Willoughby, , Am. J. Phys. 84 (6), 458 (2016), WWW Document, (https://doi.org/10.1119/1.4945347).
![]() K. Williamson, E. Prather, and S. Willoughby, Applicability of the Newtonian gravity concept inventory to introductory college physics classes, Am. J. Phys. 84 (6), 458 (2016), <https://doi.org/10.1119/1.4945347>.
![]() Williamson, K., Prather, E., & Willoughby, S. (2016, May 23). Applicability of the Newtonian gravity concept inventory to introductory college physics classes. Am. J. Phys., 84(6), 458-466. Retrieved April 24, 2025, from https://doi.org/10.1119/1.4945347
![]() Williamson, K, E. Prather, and S. Willoughby. "Applicability of the Newtonian gravity concept inventory to introductory college physics classes." Am. J. Phys. 84, no. 6, (May 23, 2016): 458-466, https://doi.org/10.1119/1.4945347 (accessed 24 April 2025).
![]() Williamson, Kathryn E., Edward Prather, and Shannon Willoughby. "Applicability of the Newtonian gravity concept inventory to introductory college physics classes." Am. J. Phys. 84.6 (2016): 458-466. 24 Apr. 2025 <https://doi.org/10.1119/1.4945347>.
![]() @article{
Author = "Kathryn E. Williamson and Edward Prather and Shannon Willoughby",
Title = {Applicability of the Newtonian gravity concept inventory to introductory college physics classes},
Journal = {Am. J. Phys.},
Volume = {84},
Number = {6},
Pages = {458-466},
Month = {May},
Year = {2016}
}
![]() %A Kathryn E. Williamson %A Edward Prather %A Shannon Willoughby %T Applicability of the Newtonian gravity concept inventory to introductory college physics classes %J Am. J. Phys. %V 84 %N 6 %D May 23, 2016 %P 458-466 %U https://doi.org/10.1119/1.4945347 %O text/html ![]() %0 Journal Article %A Williamson, Kathryn E. %A Prather, Edward %A Willoughby, Shannon %D May 23, 2016 %T Applicability of the Newtonian gravity concept inventory to introductory college physics classes %J Am. J. Phys. %V 84 %N 6 %P 458-466 %8 May 23, 2016 %U https://doi.org/10.1119/1.4945347 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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