Soccer Ball Information

Drag vs Speed

The variation of drag force with ball speed. At high speeds, the drag force falls, which means that the ball does not slow down as much as expected. First published in Physics World magazine, June 1998 pp25–27.

Soccer Turbulent Air & Drag

When the airflow over a ball is turbulent, the boundary layer sticks to the ball almost until the air has completely passed over the ball. This produces late separation and a small drag. First published in Physics World magazine, June 1998 pp25–27.

Ball Drag

The drag coefficient of a ball plotted against Reynold’s number – a non-dimensional parameter that takes into account both the velocity and diameter of the ball. The drag coefficient drops suddenly when the airflow at the surface of the sphere changes from laminar to turbulent. The position of the discontinuity depends on the roughness of …

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Spinning Ball

A bird’s-eye view of a football spinning about an axis perpendicular to the flow of air across it. The air travels faster relative to the center of the ball where the periphery of the ball is moving in the same direction as the airflow (left). This reduces the pressure, according to Bernoulli’s principle. The pressure …

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NFHS Soccer Ball Testing and Approvals

Since the 1999-2000 school year, soccer balls used in interscholastic competition in sports for which the National Federation of State High School Associations (NFHS) writes playing rules are required to have the NFHS authenticating mark. Ball Testing Requirements: Spherical Made of leather or other suitable material that is weather resistant Of a circumference of not more than …

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Soccer Ball Physics 2

MSC.Patran Used By Researchers to Model Complex Physics of Soccer Free Kicks SANTA ANA, Calif. — May 31, 2001 — MSC.Software Corp. (NYSE: MNS), the leading global provider of simulation software, services and systems, today announced that MSC.Patran was used by researchers to help solve the mystery of ‘trick’ or ‘bending’ free kicks in soccer. Through the collaboration …

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Teamgeist II Goal Line Technology

Yokohama/Herzogenaurach, December 13th, 2007 – Today, adidas and Cairos Technologies presented the new Goal Line Technology and the adidas intelligent football tested at the FIFA Club World Cup™ in Japan from December 7 through 16, 2007.  The official match ball of the tournament, adidas Teamgeist II, features a new intelligent technology designed to assist the referee’s decision in …

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