Development of a method to quantify the contributions of horizontal and vertical forces to angular momentum generation in trampolining somersaults, and application to forward rotating somersaults.

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Author
Ollerenshaw, Richard
Date
2004Type
Thesis
Publisher
University of Wales Institute, Cardiff.
Metadata
Show full item recordAbstract
The angular momentum generated by horizontal and vertical forces during contact
with a trampoline were calculated for one elite male trampolinist performing a range
of forward-rotating somersaults. To calculate torque due to vertical forces, a method
of predicting the centre of vertical force from the bed was developed and tested for its
accuracy in the calculation of torques. The accuracy for individual trials was
considered to be adequate, and very good where groups of trials were averaged, when
compared to observed angular momentum during contact.
It was found that torque due to vertical forces contributed to angular momentum
generation, but this contribution was most significant during the second half of the
contact period as the centre of mass moved further in front of the centre of vertical
force. During the early stages of contact, horizontal forces accelerated the centre of
mass forwards and effected torque in opposition to forward rotation, limiting angular
displacement. During the latter stages, horizontal forces reversed, decelerating the
forwards movement of the centre of mass and effecting torque which assisted the
development of angular momentum for the somersaults. The forward movement of
the centre of mass was greater for more demanding somersaults; in the most
demanding somersaults, the reversal of the horizontal forces was later, and insufficient
in magnitude to fully remove horizontal velocity.
Description
MSc Coaching Science Thesis
Collections
- Masters Degrees (Sport) [168]
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