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Biomechanics ­ Angular Motion

Glossary

Angular Motion ­ Motion in a circular path about an axis of rotation. This is created by applying an
external force outside the centre of mass.

Centre of Mass ­ The point at which the body is balance in all directions.

Fulcrum ­ The fixed…

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Angular motion is probably the most common technique used in sport. It is created by
applying an external force outside the centre of mass (eccentric force), the axis of rotation becomes
where the centre of mass is located.

An example of angular motion is a somersault in gymnastics or high…

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Dodge ball ­ The performer will want to be able to change their state of motion quickly in
order to dodge the ball.
Gymnastics ­ A gymnast also has to perform a series of tumbles that being unstable will allow
them to change direction quickly and earn a higher mark.…

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The fulcrum is located between the load and the effort. An example of this is the elbow in an
over arm throw in rounders. The load is the weight of the weight of the arm, hand and the rounders
ball. The fulcrum is the elbow joint. The effort is the…

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An axis of rotation in an imaginary line about which a body will rotate. The importance of
manipulating the centre of mass returns here. There are 3 axes about which the body can rotate ­

Longitudinal such as a pirouette
Transverse such as a front somersault
Frontal such as a…

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their body position. A simple example would be if you were spinning on a chair, opening your arms
and legs out, then tucking them in will help conserve momentum.




Angular momentum is referred to as a conserved quantity. A performer will want to
generate as much as possible at take-off…

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They will tuck their arms and legs into their body, close to the transverse axis to lower their
moment of inertia which will increase their angular velocity to increase the overall speed of rotation.
This does although give them little control, but it is not needed as they are not…

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