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Study on the Angular Momentum of Forward Rotation of the Long Jump(PDF)

《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:
2014年02期
Page:
140-
Research Field:
体育学
Publishing date:

Info

Title:
Study on the Angular Momentum of Forward Rotation of the Long Jump
Author(s):
Shi Lei1; Chen Liang2
(1. School of Sports Sciences,Tianjin Normal University,Tianjin 300387,China) (2. Biomechanics of Sports Laboratory,Tianjin University of Sports,Tianjin 300381,China)
Keywords:
long jump; take-off; forward rotation; angular momentum
PACS:
G823. 3
DOI:
-
Abstract:
Based on the quantitative analysis towards the changing characteristics of the angular momentum when the long jumpers are turning around the centre of mass horizontal axis in the process of the take-off by video analysis method,the study finds that influenced by the breaking force,the body gets the angular momentum of turning forward in the stage from touching down to the vertical support in long jump,and the rate of growing is very large. After passing through the vertical support surface,the breaking force changes to the motivate power,as it is affected by the moment of eccentric force,the angular momentum increases or decreases,but in a small range;the difference between the actual achievement and theory achievement is positively related to the plate body of spin angular momentum,which shows that the reducing the take-off from the board before the spin angular momentum helps to maintain the body in balance in the air,so that atheletes can improve performance by making more effective use of the achievng distance of body mass parabola.

References:

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Memo

Memo:
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Last Update: 2014-06-30