Hannover 2010 – wissenschaftliches Programm
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DD: Fachverband Didaktik der Physik
DD 19: Postersitzung
DD 19.16: Poster
Dienstag, 9. März 2010, 16:00–18:00, Foyer Osteingang
Motion Analysis of the 2009 Men's 100 m World Record — Johannes Sauren1, •Benjamin Lieby2, and Elmar Schmidt2 — 1Hogeschool Zuyd, Heerlen, The Netherlands — 2SRH Univ. of Applied Sciences, Heidelberg, Germany
The fabulous 100 m world record of Jamaica's Usain Bolt (9.58 s on Aug. 16th, 2009, in Berlin) has intrigued not only sports fans. It can also be fruitfully used in physics teaching as a real life event, although there are some caveats.
After downloading public-domain, high-resolution renditions of the record race for a motion analysis, we first used video-cutting software to clock individual frames when the winning athlete passed the visible on-track markers. A polynomial fit of these data was possible with r^2 = 0.9998, however, it failed to produce physically plausible velocities and accelerations.
Data published by the IAAF, when evaluated in the same way, did not produce these artifacts, and showed the record-breaking dash to be composed of a 3-second phase with decreasing acceleration, followed by a high-speed phase peaking at 44.2 km/h near 7.5 s. A slight deceleration at the very end can be used as an estimate for still further, albeit small improvements of the 100 m world record, as has been down before.[1] The relevance of the results w.r. to biokinematics as well as training methods is discussed.
[1] H.K. Eriksen et al., Am. J. Phys 77, 324 (2009)