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Why is football in the air and change to

iamyibande12010-02-27 21:10:27 +0000 #1
read a lot of today's free-kick master of the show, I am surprised why football in the air and change to it?
Lu Kee brother2010-02-27 21:12:30 +0000 #2
the traditional arc, such as David Beckham free-kick arc is the use of ball spin to produce an arc. Spin of the ball will lead to the air around the ball with rotation, internal rotation to the right foot, for example, the air at this time the direction of the ball on the right forward, left backward direction of the air, because the ball is in progress, relative to the ball for the air is to later, the same direction with the ball on the left to speed up the left side of the air flow speed; and the right in the opposite direction, slow down the right side of the air flow rate. According to the basic principles of fluid mechanics, fast pressure is small, the left side of the pressure is less than the right, the ball deflected to the left under the pressure of the air.

But now there were many strong, or the use of ball-point play, any changes in law, which is sometimes the ball does not spin, and the arc along the irregular operation of this technology is becoming the mainstream.
wsshzhh2010-02-27 21:33:21 +0000 #3
As the play points, playing strength and speed of rotation of the ball
nsun272010-02-27 21:22:57 +0000 #4
foot law and the role of gravity
BayernMunchenW2010-02-27 22:29:12 +0000 #5
gravity, air friction, air dynamics, the force imposed on the soccer

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