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Investigating the Mechanics of the 100 Metre Sprint

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Introduction

Investigating the Mechanics of the 100 Metre Sprint In this assignment, I will be investigating the way in which an athlete run a race of 100 metre and also I will look at other different possibilities such as when an athlete accelerate or decelerate during the race. The course is a track of 100 metres in length and I decided that I would not take into account the wind variation in this model because of lack of information. So therefore I assume that there is light wind that will not affect the time. Before my research I always thought that sprinters run as fast as they can for the whole distance of the race. But in my researches using the Internet and books, I found out that sprinting is a skilful activity just like football kicking and tennis. Such activity must be practised constantly to retain or improve an athlete's level of ability. Currently the world record time of the 100-meter race is 9.79 seconds produced by Maurice Greene. I was able to work out his average speed in the following way: Average speed= 100 = 10.21 m/s-1 9.79 The 100m are a very intense and technical race. Initially the athlete should concentrate totally on his starting technique, which he has fine-tuned in training. ...read more.

Middle

This is because maybe my muscles had a limited quantity of 'fuel' so called ATP (adenosine triphosphate), which ran out quickly, no wonder why retardation occurred early. However sprinters have developed a mechanism called 'alactacid anaerobic', which provides a great amount of energy for use of ATP. For the next models, since I am assuming the different possibilities of how sprinters run. I decided that the time should be a bit slower since that the athlete is not stated as a world-class sprinter who breaks the barrier of 10 seconds but maybe an average, athlete so therefore I chose his time to be 10 seconds and besides this is less complicated. However I will use the technique of sprinting of Maurice Greene. The following 2 models show how the wind variations can affect the time. They help sprinters to break the world records or sometimes they prevented them to break it. MODEL 3: Assumption being made: * Athlete should be on the block start. * Head wind (blow against) 2 ms-1. * The athlete should start at rest on the block start. Velocity (ms-1) without air resistance Head wind of 2ms-1 Time (s) Head wind is when the wind blows against the athlete and this can increases the time. ...read more.

Conclusion

Time (s) Second sprinter: 126 meters Velocity (ms-1) Time (s) Third sprinter: 126 meters Velocity (ms-1) Time (s) Fourth sprinter: 120 Velocity (ms-1) Time (s) As you can see from the graph, the last three sprinters have already built up speed before they reached the starting line and this suggest that they can accelerate quicker than the 100-meters sprinter. Analysis and interpretation: After carefully studying the models, I noticed that most athletes use almost the same technique, which first accelerate then stay at constant speed and they eventually decelerate slightly. But in my models I have shown different ways of running where some of them were a bit unrealistic. For examples model 6, the athlete accelerates at the beginning, remains at constant speed, and accelerates again toward the finish line. Model 7 also shows that the athlete once he attained his full speed, he remains steady speed all the way to the finishing line. Even though they are some assumptions but I do not think athletes could run in such way because they have some limited energy, which run out quickly. However, these two models can produce the fastest time for the reason that there is no retardation but positive speed. Overall, I think that Maurice Greene's technique is the effective one that human can run. But winning the 100-meters race depends on how they conserve their energy and muscular they are. ...read more.

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