1. INTRODUCTION TO BIOMECHANICS FORCE Week 6

3. Key Content What is biomechanics? Performance analysis Equipment Benefits of biomechanics Force production Types of force Force summation

4. What is Biomechanics? The study of how the physical laws of mechanics and physics apply to the ________ ________ Why? Improve ___________ How injuries occur Injury ___________ and rehabilitation Design and development of ___________

5. Performance Analysis Evaluating quality of performance and developing better practices Quantitative (main method) and qualitative Permanent record (eg: video) Systematic observation of performance Analysis of selected aspects

6. Equipment Technologically driven Huge advances in recent years Read through information on page 51

7. Benefits of Biomechanics Jot down some of benefits from page 51

8. Force Production Force is any ___________ or ___________ activity that tends to alter the state of motion of a body The body could be a human body, ball, discus, javelin, racquet, bat, etc The force can get the body to: Move Speed it up Slow it down Stop Change direction

9. Types of Forces Force without motion – isometric force Force with motion – isotonic force Sub-maximal force Maximal force

10. Force without Motion Isometric force Isometric contraction Muscle length does not ___________ Eg: pushing against a wall, gripping a cricket bat

12. Force with Motion Isotonic force Isotonic contraction Muscle length ___________ Changes the state of motion of the object (body) Eg: shot put, taking a catch in cricket, diving into a pool

14. Sub-maximal Force Force needs to be at an optimal level for successful performance Sometimes we want less than maximum force Eg: tennis drop shot, chip in golf, basketball lay-up

16. Maximal Force Some activities require maximal force for a higher chance of success This usually happens through combination of a number of forces – force summation Eg: high jump, javelin, throw from the outfield in softball

18. Force Summation Combination of forces to produce a maximal force 2 types Simultaneously: explosive action of all body parts occurs at the same time Eg: high jump take-off, vertical jump for rebound in basketball Sequentially: body parts are moved in sequence to generate a great force Eg: throwing, striking, kicking

19. Simultaneously…sequentially

20. Sequential Force Summation What are the 4 parts to a sequential force summation technique (page 54) Write down (or draw) the steps in force summation for a throw from the outfield in softball

21. Homework Task Answer the following questions 1. Pick one benefit of biomechanics for a sport of your choice and discuss in detail 2. For the same sport analyse and discuss in detail one form of equipment that has used biomechanics 3. Describe the sequence of body parts in the force summation for a tennis serve