Mysterious science behind the direct free kick

When making a free kick, the player always seeks to swirl the ball. The aerodynamics of a misaligned shot will make the ball follow an arc in the goal.

>>>Predict the team to win the 2014 World Cup with science

Instead of shooting straight into the ball, the player often misses the center to have the necessary spin that causes the ball to twist. This increases the initial speed of the ball and creates a "gas chaos" around it.

Photo: Vietnam +

At this point, since there is almost no obstacle, or any opposition, the ball flies in an almost straight line. And when it decelerates, the air becomes more aerodynamic, increases resistance and the ball goes slower.

When creating twisted effects, physicists still call it "Force Magnus" . The spin creates a difference in the speed of air flow through the ball.

The air flies faster when the ball moves in the same direction as the gas stream, meaning the pressure is lower. Conversely, when the gas flow rotates more slowly, the pressure is larger.

The ball of course will be sucked down by the slump and turned away from the normal orbit.