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Throwing a Cricket Ball

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by

Michael Stevens

on 19 September 2014

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Transcript of Throwing a Cricket Ball


Anatomy
Biomechanics
Science behind throwing.
Although this video is about baseball the same things applies to cricket.
Forces When Throwing
-Muscular
-Gravitation
-Aerodynamic
-Interia
-Centrifugal

Newtons First Law
Newtons first law is of Inertia. This states that an object at rest remains until a force acts to change its state of of rest.
This apply to cricket and throwing a ball as the ball will not move until the throw it and apply forces behind the ball. When the ball is in my hand it has stationary inerita. The arm acts as a large force and overcomes this. Once the force has been applied action occurs and the ball will be thrown.
Inter Relationships
I am able to analyse the inter-relationships of my skill by preforming the skill, filming it and then critique it. With this gained knowledge of my technique I was able to research the throwing action and apply this to my own action. I could then have practice sessions based around improving my technique. I could then film myself throwing again to see if I had made any improvements. This is one way of being able to move from the associative stage in the skill to the autonomous stage. When braking down my skill I could see I was making errors with my elbow position. When I release the ball my elbow is level or even sometimes below my shoulder. This restricts the amount of force being applied on the ball due to the less leverage I have. Breaking the skill down like this is called part learning. After learning my elbow is in the wrong position, I would practice throwing at a target for 10 minutes whilst videoing it. I would then look if my action had improved. I would keep doing this over and over until I execute this part of the skill automatically. This is called distributed practice. The second newton law interrelates with my poor elbow position, the second newton law states that; The acceleration of a body is proportional to the force being applied and the change in motion (acceleration) occurs in the direction that the force is applied. When my elbow is at level or below my shoulder I will not be able to gain the maximum amount of force so when I throw the ball it will be less affective and have less acceleration.To break down my throwing action I need to separate the action into three phases; prep phase, action phase and follow thorugh. When I throw the ball I really need to focus on getting my elbow higher mainly in the prep and action phases. The muscles that are used during these two faces of throwing are; Wrist Flexors, Bicep, Triceps, Deltiod and Latissimuss Dorsi. So when I am preforming the skill i need to focus on these muscles to keep my elbow above my shoulder, so I can move onto the autonomous stage in the skill.
When reviewing myself preforming the skill I also noticed errors in my follow through. After I have thrown the ball my left arm goes off to the side rather than pull in tight to my body. This inter-relates with Newoton's second and third laws. The second Law is that of that the grater force applied to an object, the greater acceleration the object will have. If I work on my follow through and get my arm to pull in closer to my body, I will be able to produce more force on the ball, thus the ball will have greater acceleration. The third law inter-relates with this part of my action by the follow through of my action, being a reaction. The third law states that for every action there is an equal and opposite reaction. After I have release the ball I need to follow through to gain the maximum amount of force put on the ball. This is the reaction. To fix this part of my throwing technique i will utilise distributed practice. I will throw at a target for about 10 minutes, focusing on pulling my arm in close to my body. I had this filmed to see if I made any improvements. After reviewing if I had made any improvements, I then carried on throwing at a target focusing on my follow through. I kept doing this until I had reached the autonomous stage in my action. In the follow through the main muscles I had to focus on were; Wrist Flexors, Triceps, Deltoid and Pectoral. When working on pulling my arm close to my body I need to teach my nervous system to use these muscles, after continually repeating this movement my nervous system will do this part of my action automatically. Thus I will move to the autonomous stage of the skill.
Practicing Skill
Wrist at bad angle
on release
Throwing a Cricket Ball
Skill Learning
Newtons Second Law
Newtons second law is the law of acceleration. This states the acceleration of a body is proportional to the force being applied and the change in motion occurs in the direction that the force is applied. This applies to my skill of throwing a ball by the greater force I apply to the ball through my arm, the greater acceleration the ball will have.
Newtons Third Law
The third law is the law of action-reaction. This means for every action there is an equal and opposite reaction. When I throw the ball I am clearly applying force to it, this is the action. The reaction is the force that the ball is applying to my hand. When I throw the ball, the ball has a large acceleration but my arm doesn't accelerate backwards due to other forces being applied to it. The muscles in my arm counteract the reaction forces that are being applied.
Follow through can be improved
Plan to practice technique
Technique of Throwing
Elbow needs to be above shoulder
Force Summation
When throwing a ball, to gain the maximum amount of force on the ball by using all of my muscles need to used to do so. My legs are the largest muscle group on my body so they need to moved first. followed by my hips, torso, shoulders, elbow then finally the wrist which is the part of the body which releases the ball. To gain the maximum amount of force the need to work in conjunction with each other and follow each other in that order so the force can be distributed correctly.
Projectile Motion
When throwing a cricket ball once it has been released from the hand it will act as a projectile thus traveling in a parabolic path. When the ball is thrown there will be a vertical velocity component and a horizontal velocity component. Knowing that gravity is an acceleration acting against the vertical velocity it is key that the ball is thrown at the correct angle such that it has enough horizontal velocity to travel as far as. The angle of release depends on where the ball is being thrown to. If it is a long distance throw the angle of release will need to be large, if a short distance throw the angle will need to be smaller.
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