News chunk brought to you the best report on this belated discovery.
Scientists found that one of the most spectacular goals in the history of football was not the result of mere luck. They confirmed that in 1997 the Brazilian Roberto Carlos sent the ball intentionally with a penalty kick into the goal by the French in particular arc of the curve.
Goalkeeper Fabien Barthez did not move from their seats and looked astonished. Fans and experts believed that this attack contradicts the laws of physics or turned accidentally.
However, a group of French researchers derived a formula that describes a similar trajectory.They argue that it can repeat, if you hit the ball hard enough to give it a certain rotation and, most importantly, if you stay far enough from the gate.
Carlos scored a legendary goal in the first leg of the international friendly tournament Tournoi de France, held in France on the eve of the 1998 World Cup.
Backspin and pruning
Results trajectory published in the journal The New Journal of Physics.
"We showed that the ball was not just podkruchen, but also flew in a spiral reminiscent of a snail shell - told BBC Christophe clan from the Paris Institute of Ecole Polytechnique. - And the closer to the target curve increased.
Since Roberto Carlos struck the ball with the outer side of the foot with a fairly large distance - about 35 feet - the ball going away from the gate right at the beginning, became more and more wrapped up the left and managed to fit in turn conceived player and touch the inside of the rod.The audience thought it unlikely.
It is believed that the ball can also give the rotation and on an inclined axis of a kick (kick "dry leaves"). Then he was on the last part of the trajectory falls sharply.
Christophe Clan and his colleague David KERE learned all this when studying the flight of plastic balls in a container filled with water. This eliminated the influence of eddies of air and reduce the earth's gravity to bring your motion to that which describes the formula.
"At present the pitch sometimes you see something like a perfect flight of a spiral, but its gravity bends, - the doctor said clan. - But if you hit so hard, as did Carlos, you can reduce the influence of Earth's gravity to a minimum."
The decisive factor, deceived Barthez and stunned the audience, scientists believe a large distance of ball flight.
0 comments:
Post a Comment