الخميس، 29 ديسمبر، 2016

The physics behind Subri"s swerve



fifa.noJSVideoMessage When Mohd Faiz Subri’s remarkable free-kick hit the back of the net at the Bandaraya Pulau Pinang Stadium in February, the roof was raised as Penang fans were sent into delirium. But there would likely have been a fair number of supporters inside the ground who bore witness, and then asked themselves and fellow fans: ‘how on earth did he do that?’
The incredible amount of swerve that Subri achieved with his dead ball, struck from the left-hand side of the pitch with his right foot, curving out and back in before dipping past the helpless goalkeeper Mohd Nasril Nourdin in the Pahang goal, seemed to defy physics.
A FIFA-backed study has been investigating the aerodynamics behind the swerve of footballs since October 2015, with the research triggered by at-times anomalous ball movement. Can the experts explain how Subri did it?
“Judging from the curve going to the right, the ball is spinning in a clockwise direction from the player’s point of view, so he probably ..

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