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It happens every four years: The World Cup begins and some of the world’s most skilled players carefully line up free kicks, take aim — and shoot way over the goal.
The players are all trying to bend the ball into a top corner of the goal, often over a wall of defensive players and away from the reach of a lunging goalkeeper.
By the “wrong way,” Bush means that two otherwise similar balls struck precisely the same way, by the same player, can actually curve in opposite directions, depending on the surface of those balls.
It may, because the question of how a spinning ball curves in flight would seem to have a textbook answer: the Magnus Effect.
In soccer, the same thing usually occurs with free kicks, corner kicks, crosses from the wings, and other kinds of passes or shots: The player kicking the ball applies spin during contact, creating rotation that makes the ball curve. So far, so intuitive: Soccer fans can probably conjure the image of stars like Lionel Messi, Andrea Pirlo, or Marta, a superstar of women’s soccer, doing this.
If the reversing of the Magnus Effect has largely eluded detection, of course, that is because soccer balls are not absolutely smooth — but they have been moving in that direction over the decades. There is actually a bit more to the story, however, since sometimes players will strike balls so as to give them very little spin — the equivalent of a knuckleball in baseball.
Bush’s own interest in the subject arises from being a lifelong soccer player and fan — the kind who, sitting in his office, will summon up clips of the best free-kick takers he’s seen.
And Bush happily plays a clip of Brazilian fullback Roberto Carlos’ famous free kick from a 1997 match against France, where the player used the outside of his left foot — but deployed the “positive” Magnus Effect — to score on an outrageously bending free kick.
James Matthews is the co-founder of Eden Rock Capital Management Group, an investment advisory firm with expertise in credit and structured finance. James' father David Spencer, a former mechanic and his stylish mother Jane scooped up the luxury Eden Rock hotel in St.
The glamorous Caribbean resort is vacationed by a number of rich and famous faces, including the Middletons.

James' connection to the British royal family goes further than his relationship with Kate's little sister. The businessman attended the all-boys boarding school Eton College like the Prince William and his brother Prince Harry.
James' brother Spencer is often pictured with Pippa's brother James and girlfriend Donna Air. The Matthews' family ensured that Michael's legacy will live on through the Michael Matthews Foundation, a charity that provides an education to around 1200 children after constructing school buildings in remote places.
James' girlfriend Pippa has lent her support to the foundation by carrying out a number of sporting challenges. Pippa Middleton and James Matthews have been an item long before their public debut at Wimbledon this week.
This phenomenon was first described by Isaac Newton, who noticed that in tennis, topspin causes a ball to dip, while backspin flattens out its trajectory.
For a right-footed player, the “natural” technique is to brush toward the outside of the ball, creating a shot or pass with a right-to-left hook; a left-footed player’s “natural” shot will curl left-to-right. But this kind of shot — the Brazilians call it the “chute de curva” — depends on a ball with some surface roughness. Bush says it is due to the way the surface of the ball creates motion at the “boundary layer” between the spinning ball and the air. While other sports, such as baseball and cricket, have strict rules about the stitching on the ball, soccer does not, and advances in technology have largely given balls sleeker, smoother designs — until the introduction of the Brazuca, at least.
These include Juninho Pernambucano, a Brazilian midfielder who played at the 2006 World Cup, and Sinisa Mihajlovic, a Serbian defender of the 1990s. Michael had become the youngest Briton to reach the summit of Mount Everest before his death.

Players, fans, and pundits all suggest that the new official tournament ball, introduced every four years, is the cause. Specifically, researchers increasingly believe that one variable really does differentiate soccer balls: their surfaces.
A curveball in baseball is another example from sports: A pitcher throws the ball with especially tight topspin, or sidespin rotation, and the ball curves in the direction of the spin.
Without that, this classic piece of the soccer player’s arsenal goes away, as Bush points out in his article, “The Aerodynamics of the Beautiful Game,” from the volume “Sports Physics,” published by Les Editions de L’Ecole Polytechnique in France. The rougher the ball, the easier it is to create the textbook version of the Magnus Effect, with a “positive” sign: The ball curves in the expected direction.
Where that transition arises is influenced by the surface roughness, the stitching of the ball.
It is harder to control a smoother ball, such as the much-discussed “Jabulani” used at the 2010 World Cup. If you change the patterning of the panels, the transition points move, and the pressure distribution changes.” The Magnus Effect can then have a “negative” sign.
The new ball used at this year’s tournament in Brazil, the “Brazuca,” has seams that are over 50 percent longer, one factor that makes the ball less smooth and apparently more predictable in flight.
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