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NCEA Level 3 - Physical Education AS 91499 "Analyze a physical skill performed by self or others."
by

## Khodesh Temita

on 19 June 2013

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Strengths:
AS 91499 Analyze a physical skill performed by self or others
Strengths and Weaknesses
Preparation Phase:
When the player jumps up for the badminton smash he applies Newton's third law which states: For every action there will be opposite and equal reaction. As he pushes downwards, he applies force downwards which results in a force to propel him into the air upwards.

Execution Phase:
The player applies Newton's second law: F=ma - Force is mass times acceleration. As the player extends his elbow which is a hinge joint that allows extension and flexion motions applies the gathered force onto the mass (shuttlecock), it accelerates in the direction in which the force was applied.

I will be critically analyzing my partner's badminton smash shot
The badminton smash is the most potent of all badminton shots. There is almost no defense against a well executed smash. It can be played both on the forehand and backhand sides.
The smash is a shot hit with power and speed downward into the opponent's court. The angle and the steepness of the shuttlecock's trajectory will make it hard for an opponent to retrieve.

In this assessment I will talk about the jump shot of the badminton smash - the jump smash. I will breakdown biomechanical features of the skill and compare the skills of my partner's smash to an ideal smash.

How to perform the badminton smash at an autonomous (professional) level .
1.
2.
The Breakdown of the Badminton Smash
Preparation phase
Execution phase
I will be analyzing the biomechanical principles for each phase:
Inertia
Momentum
Stability and Balance
Centre of Mass
Force
Levers
Projectile Motion
Newton's Law
Newton's Laws
Stability and Balance + Momentum
Preparation Phase: The player is very stable and balanced, the centre of gravity (COG) and his line of gravity (LOG) lie within the margins of his base of support (BOS). The BOS is very wide with two points of contact with the ground, as he crouches down to gather force to propel himself upward.

Execution Phase: The player is stable because his COG still remains within his BOS as he launches into the air, although only using one leg to propel off. He is more vulnerable to external factors in the air that could cause him to land awkwardly and cause damage to his physical well being.

Follow through: His COG moves after the racquet makes contact with the shuttlecock, as his body leans forward with the momentum. His right leg then moves forward to re-establish his BOS and ensure his stability and balance is maintained. The player lands on one foot, meaning that there is more chance of the force going outside of the BOS compared to landing on two feet which increases his chance of a safer landing. He re-gathered his balance and stability despite the poor landing.
Force Summation

Inertia
Preparation Phase:
The player sights the flight of the shuttlecock and lowers his COG in preparation of the smash, allowing for a slight contraction causing flexion hamstrings, gluteals and gastrocnemius, consequently generating force. The amount of force is directed downwards

Execution Phase: The generated force is then directed back through the player's body as it states in Newton's 3rd law: For every action there is an equal and opposite reaction. The reacting force sends the player up off the floor with the full extension of the hamstrings coinciding with the flexion of the quadriceps and gastrocnemius, thus overcoming the inertia that kept the player on the ground.

Preparation - The player searches where to make the exact placement of the shuttlecock and moves accordingly to prepare for the smash, so he that he is in position to attempt to execute the shot. To ensure that the appropriate parts of the body move at the correct time, he positions his body so as to increase the chance of executing the smash successfully.

Execution Phase: The sequence and timing of the player's body segments and muscles is legs: gastrocnemius -> Quadriceps -> Gluteals -> Hip flexors -> Abdominals -> Pectorals ->Deltoids -> Tricep/Bicep -> finally the hands at the racquet. His legs have the largest muscle groups and are farthest from the shuttlecock. The momentum the legs generate will be passed to the smaller muscle groups until it gets to the shuttlecock. He stretches out his force arm, making it the longest possible 3rd class lever and moves it quickly through the full range of motion to generate a large force, so his force arm has maximum velocity and momentum on contact with the shuttlecock.

Projectile Motion
Preparation –When the player strikes the shuttlecock with the racquet it will become a projectile. I presume the player mentally considered the height, angle and speed of release of the shuttlecock. His speed of release must be high enough to clear the net and to make it difficult for the opposition to receive, but not so great that the shuttlecock would go out the back of the court.

Execution – He struck the shuttlecock with his force arm at full extension above his head to maximize the height of release, and to increase the range possible on the badminton smash. His angle of release was less than 45 degrees. It had to be high enough to clear the net, but low enough for the shuttlecock to have flight time and horizontal distance.

Follow-Through – The follow-through helps determine the path of the shuttlecock. Once the player made contact with the shuttlecock at maximum height, he flexed his hand downward just enough so that the shuttlecock would go over the net, but not out the back of the court.

Weaknesses:
The strength of the player's smash shot was that he was able to produce a large amount of force for his shot, due to his size and shear physical capabilities
His technique was poor in his preparation phase and execution phase, consequently his shot lacked the full potential of what he could have produced if he had used two feet for take off for the smash and also used his arms to help gather more force to put through the smash.
By Khodesh Temita
13PEDT B07
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