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What Do I Really Need to Know About Biomechanics

What Do I Really Need to Know About Biomechanics. The Cole’s Notes to Mr. Wardle’s abstract and somewhat disjointed thinking (if you have had Mr Gajic as a teacher then you will be just fine). Kinematics.

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What Do I Really Need to Know About Biomechanics

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  1. What Do I Really Need to Know About Biomechanics The Cole’s Notes to Mr. Wardle’s abstract and somewhat disjointed thinking (if you have had Mr Gajicas a teacher then you will be just fine)

  2. Kinematics • The branch of biomechanics that studies the movement with reference to the amount of time that it takes to carry out an activity • It includes • Movement • Path of the Movement • and Time

  3. Distance and Displacement • Distance • The path that an object or body follows • Displacement • The length of a straight line from start to finish points

  4. Speed and Velocity • In this course the difference is not really needed for any practical applications as we are studying short distance linear movements • Velocity is the change in position and the time it takes for it to happen

  5. Acceleration • Usually done as an average over a period of time • The rate at which velocity changes • Can be easily found from D/T and V/T graphs • From Newton’s 2nd law (F=ma) • Acceleration due to Gravity is 9.81m/s/s

  6. Torque • The moment of force at a perpendicular distance to a joint or point of rotation • Ex - turning a bolt and the force on the handle (the further your hand is away from the blot the easier it is – the longer the moment arm) • Ex – Closing a door (I think we have talked about this one enough)

  7. Newton’s Laws • 1st – Objects are Lazy • 2nd – F=ma • 3rd – Everything has an equal and opposite consequence

  8. Linear Kinematics • Momentum – mass X velocity • Inertia – the reluctance of a body to change what it is doing • Force – a pushing or pulling action that causes a change of state of movement of a body

  9. Angular Kinematics • Movement but involving some sort of rotational movement • Can happen with linear movement • Angular displacement is the number of degrees (or radians, 1 radian = 57.3’) that an object moves through • Angular velocity is the rate of change of angular displacement • Angular acceleration is the rate of change of angular velocity

  10. Examples of Angular Kinematics • A skater turns at 360’ (6.28 radians) – this is her angular displacement (1 turn – it doesn’t matter how “big” she is – that would be circumference) • If each turn takes her 1 second her angular velocity is 360’/s or 6.28r/s • If she speeds up to double that rate in 1s her acceleration is 360’/s/s or 6.28r/s/s ending at 720’s

  11. Angular Momentum • Angular Momentum = Angular velocity X moment of inertia • Is set once a body is “free” due to Law of Conservation of Motion • Applies to skaters, divers etc • They decrease their moment of inertia (width – bring their arms in) and in order to keep their Angular Momentum the same their Angular Velocity speeds up

  12. D/T Graphs • 1 – stopped (doesn’t matter where this is on the y axis) • 2 – constant velocity • 3 - accleration

  13. V/T • Stopped • Decreasing Velocity • Increasing Velocity • Stopped

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