The Science of Soccer by John Wesson PDF

By John Wesson

ISBN-10: 0750308133

ISBN-13: 9780750308137

For the 1st time ever, technological know-how offers us the solutions to questions like "what's the opportunity of a staff that wins the League or Premiership additionally successful the Cup? are you able to expect what percentage ambitions could be scored? What's the simplest top for footballers? Is the profitable workforce the easiest team?" The technology of football is an interesting e-book, facing quite a lot of topics the place clinical research should be utilized to soccer. beginning with a qualitative description of the elemental physics that relate to the ball and its leap, the writer then strikes via kicks and throws to an easy account of the extra complicated physics of a ball in flight. pleasing your medical interest, this e-book uncovers facets of the sport that aren't quite often mentioned. It features a examine online game conception, how the principles impact the stream and delight of the sport, why the simplest workforce doesn't regularly win, strange data approximately gamers, and an perception into the economics of the sport.

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The drag on the ball reduces its velocity during the ball’s flight. The graph shows the fall in the horizontal part of the velocity with time for a 70 miles per hour kick at 458. The horizontal velocity starts at 50 miles per hour and is roughly halved by the time the ball reaches the ground. turns out that 458 no longer gives the maximum range for a given speed. Because the main effect of the drag is to reduce the horizontal velocity, the maximum range is obtained by making some compensation for this by increasing the initial horizontal velocity at the expense of the vertical velocity.

This limits the distance the arms can move. The back is initially arched with the ball behind the head, and the muscles of the body and arms are then used to push the ball forward and upward. For a long throw the ball remains in contact with the hands over a distance of about 2 feet. Taking this figure the average acceleration of the ball needed to reach 45 miles per hour is 34g. Since the ball weighs approximately a pound this means that the average force on the ball must be about 34 pounds; the maximum force will of course be somewhat larger.

Because the main effect of the drag is to reduce the horizontal velocity, the maximum range is obtained by making some compensation for this by increasing the initial horizontal velocity at the expense of the vertical velocity. This means that the optimum angle is less than 458. Although at high speeds the optimum angle can be substantially lower than 458, it turns out that the gain in range with the lower angle is slight, typically a few yards. Nevertheless goalkeepers do find that they obtain the longest range goal-kicks with an angle lower than 458, but this might be unrelated to air drag.

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The Science of Soccer by John Wesson


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