Biomechanics

Biomechanics

1. Motion

   • Linear Motion
     • Motion along a line
     • Movement of Javelin
     • Can be a curved line
     • Skeleton Bob
   • Angular Motion
     • Movement around a fixed point or axis
     • Turning of a wheel
     • Turning of the arm during an overarm cricket bow
   • General Motion
     • A combination of Linear & Angular motion
     • A wheelchair athlete. Chair & body = Linear. Wheels and arms = Angular
     • Javelin Thrower. Body & javelin = Linear. Arms & Legs = Angular

2. Force

   • Functions
     • Cause a body at rest to move
     • Cause a moving body to change direction, accelerate or decelerate
     • Change an object's shape

3. Centre of Mass

   • The point at which the body is balanced in all directions

4. Newton's Laws of Motion

   • 'Law of Acceleration'
     • The rate of change of momentum of the ball, is determined by how much power is applied
     • When a force acts upon an object, the rate of change of acceleration is proportional to the size of the force.
   • 'Law of Inertia'
     • In a penalty kick, the ball remains stationary unless acted on by the player (external force).
     • 'A body continues in a state of rest or uniform velocity unless and acted upon by an external force
   • 'Law of Motion'
     • When the ball hits the bar (action), there is an equal & opposite reaction force (rebounding the ball)
     • 'For every action, there is an equal & opposite reaction'

5. Stability

   • Factors affecting Stability
     • Position of athlete's line of gravity
     • Position of athlete's line of gravity
     • Size of athlete's area of support

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