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An introduction to a few more biomechanical principles

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- 1. More Biomechanical Terms
- 2. Inertia <ul><li>Inertia is the term used to describe a body's resistance to a change in its state of motion </li></ul><ul><li>Think of it as an objects resistance to beginning movement </li></ul><ul><li>The heavier the object, the greater its inertia and therefore the greater the force required to move it or change its state of motion </li></ul>
- 3. Activity 1 <ul><li>In pairs, chest-pass the basketball and medicine ball over three distances (1m. 3m, 5m) </li></ul><ul><li>Which ball has the greater inertia? </li></ul><ul><li>Which ball is easier to throw over longer distances? Why? </li></ul><ul><li>Note which ball is more difficult to catch or stop (this will be referred to again when discussing momentum) </li></ul>
- 4. Activity 2 <ul><li>Write down 5 sporting examples of Inertia </li></ul><ul><li>A stationary soccer ball resting on the pitch </li></ul>
- 5. Momentum <ul><li>The momentum of an object is equal to its mass or weight X by its velocity </li></ul><ul><li>Momentum – Mass X Velocity </li></ul><ul><li>Therefore, an object can only have momentum if it is moving. The greater its momentum, the further it may travel and the harder it is to stop or slow the object </li></ul>
- 6. Activity 3 In the above picture, let's say that the mass is 2.0 kg and that the velocity is 4.0 m/s. That is: m = 2.0 kg v = 4.0 m/s Using the formula work out the objects momentum and express it in kg-m/s
- 7. Some More <ul><li>m = 4.36kg </li></ul><ul><li>V = 15 m/s </li></ul><ul><li>= </li></ul><ul><li>M= 15.47kg </li></ul><ul><li>V = 35m/s </li></ul><ul><li>= </li></ul>
- 8. Activity 4 <ul><li>Explain why the principal of momentum is important in sports and sports competition </li></ul>
- 9. Impulse <ul><li>The concept of impulse is best described by the following formula </li></ul><ul><ul><li>Impulse= Force X Time </li></ul></ul><ul><li>In this equation force equals the objects mass X by its acceleration and time equals the length of time for which the force is applied to the object </li></ul><ul><li>The longer a force can be applied and the greater the force applied, the greater the objects impulse </li></ul>
- 10. Types of Motion
- 11. 3 basic forms of Motion <ul><li>Linear </li></ul><ul><li>Angular </li></ul><ul><li>General </li></ul>
- 12. Linear Motion <ul><li>Linear : ALL parts of the body move through the same distance, in the same direction, in the same time </li></ul><ul><li>List 3 other examples of Linear Motion </li></ul>
- 13. Angular Motion <ul><li>Angular (rotation): The body moves in a circular path around an axis of rotation so ALL parts of the body move through the same angle , in the same direction , in the same time </li></ul><ul><li>List 3 Examples of Angular Motion </li></ul>
- 14. General Motion <ul><li>General : Combination of linear and angular, and is the most common in human movement </li></ul>
- 15. Sport/Activity Linear Angular General 100m sprint Tobogganing down a hill Teeing off at golf The shoulder in a cricket bowling action Cycling Going down a slide An ice skater spinning

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