Physics of martial arts: Incorporation of angular momentum to model body motion and strikes.

We develop a physics-based kinematic model of martial arts movements incorporating rotation and angular momentum, extending prior analyses. Here, our approach is designed for a classroom environment; we begin with a warm-up exercise introducing counter-intuitive aspects of rotational motion before p...

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Autores principales:	Alexis Merk, Andrew Resnick
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9fac5b7fd9bf486eb9ad150ec88f4620
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spelling	oai:doaj.org-article:9fac5b7fd9bf486eb9ad150ec88f46202021-12-02T20:15:06ZPhysics of martial arts: Incorporation of angular momentum to model body motion and strikes.1932-620310.1371/journal.pone.0255670https://doaj.org/article/9fac5b7fd9bf486eb9ad150ec88f46202021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0255670https://doaj.org/toc/1932-6203We develop a physics-based kinematic model of martial arts movements incorporating rotation and angular momentum, extending prior analyses. Here, our approach is designed for a classroom environment; we begin with a warm-up exercise introducing counter-intuitive aspects of rotational motion before proceeding to a set of model collision problems that are applied to martial arts movements. Finally, we develop a deformable solid-body mechanics model of a martial arts practitioner suitable for an intermediate mechanics course. We provide evidence for our improved model based on calculations from biomechanical data obtained from prior reports as well as time-lapse images of several different kicks. In addition to incorporating angular motion, our model explicitly makes reference to friction between foot and ground as an action-reaction pair, showing that this interaction provides the motive force/torque for nearly all martial arts movements. Moment-of-inertia tensors are developed to describe kicking movements and show that kicks aimed high, towards the head, transfer more momentum to the target than kicks aimed lower, e.g. towards the body.Alexis MerkAndrew ResnickPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 8, p e0255670 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Alexis Merk Andrew Resnick Physics of martial arts: Incorporation of angular momentum to model body motion and strikes.
description	We develop a physics-based kinematic model of martial arts movements incorporating rotation and angular momentum, extending prior analyses. Here, our approach is designed for a classroom environment; we begin with a warm-up exercise introducing counter-intuitive aspects of rotational motion before proceeding to a set of model collision problems that are applied to martial arts movements. Finally, we develop a deformable solid-body mechanics model of a martial arts practitioner suitable for an intermediate mechanics course. We provide evidence for our improved model based on calculations from biomechanical data obtained from prior reports as well as time-lapse images of several different kicks. In addition to incorporating angular motion, our model explicitly makes reference to friction between foot and ground as an action-reaction pair, showing that this interaction provides the motive force/torque for nearly all martial arts movements. Moment-of-inertia tensors are developed to describe kicking movements and show that kicks aimed high, towards the head, transfer more momentum to the target than kicks aimed lower, e.g. towards the body.
format	article
author	Alexis Merk Andrew Resnick
author_facet	Alexis Merk Andrew Resnick
author_sort	Alexis Merk
title	Physics of martial arts: Incorporation of angular momentum to model body motion and strikes.
title_short	Physics of martial arts: Incorporation of angular momentum to model body motion and strikes.
title_full	Physics of martial arts: Incorporation of angular momentum to model body motion and strikes.
title_fullStr	Physics of martial arts: Incorporation of angular momentum to model body motion and strikes.
title_full_unstemmed	Physics of martial arts: Incorporation of angular momentum to model body motion and strikes.
title_sort	physics of martial arts: incorporation of angular momentum to model body motion and strikes.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/9fac5b7fd9bf486eb9ad150ec88f4620
work_keys_str_mv	AT alexismerk physicsofmartialartsincorporationofangularmomentumtomodelbodymotionandstrikes AT andrewresnick physicsofmartialartsincorporationofangularmomentumtomodelbodymotionandstrikes
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Physics of martial arts: Incorporation of angular momentum to model body motion and strikes.

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