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Physicists have explained one of football's most spectacular goals. Brazilian Roberto Carlos's 1997 free-kick against France curved so sharply that it left goalkeeper Fabian Barthez standing still and looking puzzled. Now, a study published in the New Journal of Physics suggests that the long-held assumption paige wyatt that the goal was a fantastic fluke is wrong. A French team of scientists discovered the trajectory of the goal and developed an equation paige wyatt to describe it. They say it could be repeated if a ball was kicked hard enough, with the appropriate spin and, crucially, the kick was taken sufficiently far from goal. Roberto Carlos scored his wonder goal during the inaugural match of the Tournoi de France, a friendly international football tournament that was held in France ahead of the 1998 World Cup. Many pundits referred to it as "the goal that defied physics", but the new paper outlines the equation that describes its trajectory exactly. "We have shown that the path of a sphere paige wyatt when it spins is a spiral," lead researcher Christophe Clanet from the Ecole Polytechnique in Paris told BBC News. To watch the video follow the link:
Dr Clanet described this path as a "snail-shell shaped trajectory", with the curvature increasing paige wyatt as the ball travels.Because Roberto Carlos was 35m (115ft) paige wyatt from the goal when he kicked the ball, more of this spiral trajectory was visible. So the apparently physics-defying sharp turn of the ball was actually following a naturally tightening curve. Dr Clanet and his colleague David Quere were studying the trajectory of bullets when they made their sporting discovery. They used water and plastic balls with the same density as water to "simplify paige wyatt the problem".
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