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Transcript of biomechanics presentation
Goal kick or corner kick in soccer
Video of skill
Soccer Swing Kick
Through out the skill both by the rookie and professional, the joints used were the hip, knee, and ankle. The final joint, the ankle, produces complete maximal effort making the ball go as far as possible. In the case of the soccer kick, the kick is affected by where the ball is hit and how much force is generated. The largest joint, the hip joint, moves the slowest. Then the knee joint, and the fastest is the ankle which is the last, to create the best outcome.
2&3-Summation of joint forces and continuity of joint forces - during full soccer kick
1.stability- stability during the full soccer kick
When running to the ball- the athlete is unstable. When running, the athletes line of gravity is in front of them instead of in his center of gravity this allows the athlete to gain speed and produce more force in the kick. The athlete has a high center if gravity, he is not low to the ground where he would be more stable. Even his mass and base of support are small contributions to his instability.
After the kick- once the skill has been completed the athletes line of gravity is closer to center of gravity and his base of support has increased enhansing his stability. Also even though his mass and his center of gravity has not changed it does not change the effects of the other factors.
kicking the ball- The line of gravity is still outside the center of gravity producing force. There is still a high center of gravity and a small base of support. There is still a small mass and narrow base of support which this all contributes to instability.
5) Direction of force
movement occurs in the opposite direction of the applied force
This applies to a soccer kick because the athlete kicks the ball from behind and the ball goes forward
If the athlete changes the point of contact between the ball and their foot, the ball can travel in a different direction
depending on where the athletes foot hits the ball there can be some angular motion on the ball as it goes through the air spinning on its axis of rotation in its center of gravity
6) Angular motion
Is produced by the application of a force acting at some distance from an axis, that is, by torque.
Torque is the product of magnitude of the force and the radius
therefore the larger the radius the more force put on the ball
in the case of a soccer kick the radius goes from the hip to the toes. The longer the leg is, the more force can be applied because of the bigger radius. A child's kick will not travel as far as an adults kick because the child's legs are smaller and therefore less force is applied. even tho the child has a shorter leg it can be compensated if the child could swing their leg at a faster velocity.
8) Fluid Dynamics
applied whenever joint range of motion is at work
If skill requires maximal application of force, the joints should be moved through a larger range
This will cause the forces to be applied for a longer time and increase the resulting impulse.
This applies to a soccer kick because when the athlete is about to kicking the soccer ball for a goal kick he wants the ball to travel a long distance to another player. When the athlete extends the hip and flexes the knee joint it allows the lower leg (ankle and foot) to travel a longer distance allowing more force to be applied to the ball for it to travel a longer distance. Where as if the athlete was going to pass the ball over a short distance hes leg would not have to travel as long.
Angular momentum is constant when an athlete or object is free in the air.
Once an athlete or object is in air and a force has been applied outside the centre of mass then the athlete/object will continue to spin unless a force is applied in an opposite direction.
As a result, angular momentum can be applied to both the ball and athlete in this case. When the ball is kicked off center (creating the spin) it will continue spinning until it is stopped by another player, or the ground. As well when the athlete swings his leg, his antagonistic muscle that create the kick slow the leg and stop it from hurting the athlete
7) Angular Momentum
Foot-Plantarflexion of right foot
Knee-Flexion of Right knee, extension of left knee
Hip-Extension of right hip, rotation of left hip
Backswing or Recovery Movements:
Foot-Plantarflexion of right foot
Knee-Extension of both right and left knee
Hip-Internal rotation of right hip, extension of left hip
Force Producing Movements:
Stabilization of Trunk
Foot-starts to dorsiflex
knee-extension of right knee
Hip-flexion of right hip
The Critical Instant:
Knee-Right knee flexes
Hip- Right hip flexes
Foot-Dorsiflexion of right foot
Knee-Flexion of right knee
Hip-External rotation, abduction and extension
Applying the curve effect to the soccer effect: the air that flows around the ball when the ball is kicked, the air forms a thin layer around the ball. When the soccer ball is kicked is spins horizontally while in the air. The air on the side of the ball that is spinning creates a low pressure system causing the ball to "bend" or curve towards that side or the net. The side of the ball rotating against the air is responsible for causing the a higher pressure system the the side that is rotating with the air creates the bend.