Category Archives: Sports

Science in sports

The Science of the Football Swerve

With the World Cup (football – soccer) underway lets look at The science behind the swerve by Dr Ken Bray:

It took the modern science of fluid dynamics to understand exactly what happens in a swerving free kick. When a football moves through the air at low speed the air flow separates from its surface at characteristic points…

When the ball rotates – see graphic 3 – the boundary layer remains tripped but the air flow separation around the ball is distorted. Separation occurs earlier on the side rotating against the flow and later on the side rotating in the same sense as the flow. This causes a pressure differential and a deflecting force which is responsible for moving the ball in the air in a free kick.

More posts on science in athletics

Scientific Misinformation

Lactic Acid Is Not Muscles’ Foe, It’s Fuel by Gina Kolata:

But that, it turns out, is all wrong. Lactic acid is actually a fuel, not a caustic waste product. Muscles make it deliberately, producing it from glucose, and they burn it to obtain energy.
..
“I had huge fights, I had terrible trouble getting my grants funded, I had my papers rejected,” Dr. Brooks recalled. But he soldiered on, conducting more elaborate studies with rats and, years later, moving on to humans. Every time, with every study, his results were consistent with his radical idea.

Eventually, other researchers confirmed the work. And gradually, the thinking among exercise physiologists began to change.

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Score One for Sports Science

Score one for science (link broken so removed)

Bray has analyzed memorable games over the past 50 years and applied research in physics, biology, computing and psychology to the beautiful game.

Using biomechanics to calculate the absolute reach of a goalkeeper diving to try to save a penalty, Bray has identified an area near the posts and in the top corners where the goalkeeper cannot reach as the “unsaveable zone.”

“If a player were to place the ball in those regions, which are 28-30 percent of the goal area, there is not a sniff that the goalkeeper can do to get across to them,” explained Bray, from the University of Bath in England.

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Sports Engineering

Wind Tunnel at MIT for sports testing

MIT is not the first school to come to mind when discussing athletics. However, the MIT Center for Sports Innovation (CSI) is making news. The CSI mission is to expand the students’ learning experience by involving them in the development of sports technology and products.

One project at the Center is a wind tunnel used for bicycle testing:

The design and construction of the bike test stand was Brian Hoying’s senior thesis project. The data acquisition software upgrade was Mark Cote’s freshman term project. The resulting test system was deemed “the best cycling test system I’ve ever seen” by Phil White, owner of Cervélo Cycles, and sponsor of the CSC professional cycling team.

It is great to see student projects with such success.

Mark Cote, a researcher at the MIT Center for Sports Innovation, has an impressive list of clients — from Tour de France stage winners to some of North America’s leading bicycle manufacturers. Now the wind tunnel specialist plans to use his expertise in fluid dynamics to develop and, he hopes, patent his own advances in aerodynamic cycling gear.

Not bad, considering that Cote, 21, is still an undergraduate.