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# Club Coach - PowerPoint PPT Presentation

Club Coach. Mechanics. Take-Off. Time is a major factor Take-off is the most important part of any skill Without a good take-off, the skill cannot be performed correctly. Flight. This is 2 nd part of any movement using the trampoline The flight requires control and phasing. Landing.

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### Club Coach

Mechanics

• Time is a major factor

• Take-off is the most important part of any skill

• Without a good take-off, the skill cannot be performed correctly

• This is 2nd part of any movement using the trampoline

• The flight requires control and phasing

• Safety is a major factor

• Performer must be in control

• Preparation for next skill

• 1st Law :

• A body will continue in its uniform state of motion or rest unless acted on by an external force.

• 2nd Law:

• The rate of change of momentum is proportional to the force causing it and the change takes place in the direction in which the force acts.force = mass x acceleration

• if mass is constant, acceleration is proportional to the applied force

• 3rd Law:

• For every action there is an equal and opposite reaction

• The point though which the line of force of “attraction to the earth” takes place.

Centre of Mass

• Push & Pull

• A force is needed to:

• Start a motion

• Change the rate of motion

• Change the direction of motion

• Cause motion to stop

• The Rotational push or pull

• Caused by a FORCE

• Eccentric or Off-Centre Force also called Torque

• This will always create rotation

• A torque whose line of action does not pass through the centre of mass of the body on which it acts

• What happens when we displace the Centre of Mass outside the body?

Centre

of

Mass

• Movement in a straight line

• Remember Newtons’ 1st law

• A body will carry on unless acted on

• A trampolinist will bounce upwards until gravity pulls them back down again

• An off-centre force acting around the Centre of Mass will create angular movement (Somersault rotation) (Remember displacement of COM)

• Rotation around an axis

• Somersaulting demonstrates both Linear Movement and Angular Movement

• somersault axis

• twisting axis

• side somersault axis

Any rotation can be described using the 3 axis.

Inertia

• The resistance of a body to change

• Inertia is measured by Mass

• Or Not… as the case may be

• Is the amount of Linear Movement “energy” in a body as it moves

• It is the “quantity” of motion

• Velocity x Mass

• Is the rate of movement of the Centre of Mass

• Conservation & Creation

• Whatever you put into a closed system is what you have.

• Remember Newton’s 1st Law

• Can a performer do anything to help themselves to safety if they do not have sufficient somersault rotation?

• All changes in Linear momentum are caused by external forces.

• The changes are determined by the size and direction of the force

• when a performer is in flight he/she is a projectile

• the only force acting on them is the force of gravity

• the flight path is predetermined and will not change once in flight.

• the CoM will follow a parabolic flight path

• The measure of the body’s reluctance to start rotating (or change direction) around an axis

LBC

• The rate of rotation around an axis

• To control angular speed in flight (by changing the moment of inertia), the body can change shape

• The amount of rotational energy in a body as it rotates around an axis

• These are caused by external torques.

• The changes are determined by the size and direction of the torque

• Angular momentum will remain the same until changed by an external torque

• Tucking when somersaulting

• Straightening when somersaulting

• Creation of a somersault

• Angular movement is caused by TORQUE

• Torque = Force x Perpendicular distance from axis of rotation

• Twist is initiated from the bed

Trampolinist has left the bed

Arms are brought together to allow twist to continue

Arms are set whilst in contact with the bed. Movement is initiated

• The Twist is initiated in the air

• There are a number of theories given to this action.

• By moving the body outside the line, twist can be initiated

• The greater the tilt, the greater the twist

• By moving the arms asymmetrically, twist can be generated

• The greater the arm movement, the larger the twist