ABSTRACT
The Portland Timbers won their first Major League Soccer (MLS) Cup Championship in December 2015. However, if it had not been for a kind double goalpost miss during a penalty shootout a few weeks earlier, the Timbers would never have been in the finals. On Oct. 30th, after what has been called “the greatest penalty kick shootout in MLS history,” featuring a combined 22 penalties that included penalties by both goalkeepers, the Timbers won their first-round playoff against Sporting Kansas City. During the thrilling shootout, which can be watched, for example, for example on the MLS website, Sporting had two potentially game-winning penalties miss by the smallest of margins. One penalty bounced off the goalpost back into the field and another was an improbable double post miss. For a physicist, this prompts an interesting research question. Could we find an estimate by what distance the double post penalty shown in Fig. 1 failed to be the game winning shot?
Acknowledgments
The author wants to acknowledge Michael Fitzgibbons and Elliot Mylott for their helpful feedback.
- 1. http://matchcenter.mlssoccer.com/matchcenter/2015-10-29-portland-timbers-vs-sporting-kansas-city/recap (accessed 07/29/2016). Google Scholar
- 2. http://matchcenter.mlssoccer.com/matchcenter/2015-10-29-portland-timbers-vs-sporting-kansas-city/boxscore (accessed 07/29/2016). Google Scholar
- 3. http://www.mlssoccer.com/post/2015/10/30/greatest-penalty-kick-shootout-mls-history (the double post penalty is Sporting Kansas City’s 9th penalty) (accessed 07/29/2016). Google Scholar
- 4. R. Cross, “Enhancing the bounce of a ball,” Phys. Teach. 48, 450–452 (Oct. 2008). https://doi.org/10.1119/1.3488187, Google ScholarScitation
- 5. R. Cross, “Grip-slip behavior of a bouncing ball,” Am. J. Phys. 70, 1093–1102 (Nov. 2002). https://doi.org/10.1119/1.1507792, Google ScholarScitation, ISI
- 6. R. Cross, “Bounce of a spinning ball near normal incidence,” Am. J. Phys. 73, 914–920 (Oct. 2005). https://doi.org/10.1119/1.2008299, Google ScholarScitation, ISI
- 7. A. Doménech, “A classical experiment revisited: The bounce of balls and superballs in three dimensions,” Am. J. Phys. 73, 28–36 (Jan. 2005). https://doi.org/10.1119/1.1794755, Google ScholarScitation, ISI
- 8. P. Knipp, “Bouncing balls that spin,” Phys. Teach. 46, 95–96 (Feb. 2008). https://doi.org/10.1119/1.2834530, Google ScholarScitation
- 9. A. M. Nathan, “The effect of spin on the flight of a baseball,” Am. J. Phys. 76, 119–124 (Feb. 2008). https://doi.org/10.1119/1.2805242, Google ScholarScitation, ISI
- 10. A. Štěpánek, “The aerodynamics of tennis balls—The topspin lob,” Am. J. Phys. 56, 138–141 (Feb. 1988). https://doi.org/10.1119/1.15692, Google ScholarScitation
- 11. J. E. Goff and M. J. Carré, “Trajectory analysis of a soccer ball,” Am. J. Phys. 77, 1020–1027 (Nov. 2009). https://doi.org/10.1119/1.3197187, Google ScholarScitation, ISI
- 12. England-Germany, World Cup 2010, https://www.youtube.com/watch?v=HV4nc_sjW9Y (accessed 07/29/2016). Google Scholar
- 13. England-Germany, World Cup 1966, https://www.youtube.com/watch?v=0Uhe_l1h3w8 (accessed 07/29/2016). Google Scholar
- 14. http://www.fifa.com/mm/document/affederation/generic/81/42/36/lawsofthegame_2011_12_en.pdf (accessed 07/29/2016). Google Scholar
- 15. M. Lucibella, “Early fumbles in ‘DeflateGate,’” APS News 24 (3), 1 (March 2015); https://www.aps.org/publications/apsnews/201503/upload/March-2015.pdf. Google Scholar
- 16. Terrence Toepker, “Let’s weigh in on ‘Deflategate,’” Phys. Teach. 54, 338–339 (Sept. 2016). https://doi.org/10.1119/1.4961173, Google ScholarScitation
- 17. Jack Blumenthal, Lauren Beljak, Dahlia-Marie Macatangay, Lilly Helmuth-Malone, Catharina McWilliams, and Sofia Raptis, “‘Deflategate’: Time, temperature, and moisture effects on football pressure,” Phys. Teach. 54, 340–343 (Sept. 2016). https://doi.org/10.1119/1.4961174, Google ScholarScitation
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