If you're a footballe fan, and you want to improve your performance, and love to draw attention to you through a skill that you master,
All you have to do is listen to physics! Yes physics,
During my research , I found a subject titled "The goal of Roberto Carlos, who is puzzled the physicists".
So how does a goal to puzzled the physicists?
and they not find explanation to its behavior
Of course NO,
this goal never puzzled the physicists. but it puzzled who don't know physics
Let us return to the goal that was said to be a puzzled the physicists, the goal of Roberto Carlos in the summer of 1997 against the French opponent's team.
Where the player kicked the ball towards the right of the defender's wall. But it turn its path and turned left and then to enter the goal .
Everyone's surprised at what they saw at the time,
But Roberto Carlos certainly knew that his ball would be turn its path that way.
At the same time, physicists knew that too.
This phenomenon resulted from Magnus effect, for the physicist Gustave Magnus, who explained this phenomenon in 1852.
So what is Magnus effect?
Let's say we have a ball moving and rotate around itself in the same time,
during the movement of the ball in the air,
the side of the ball will rotate in the same direction of the air,
and the other side of the ball will rotate in opposite direction of the air,
that causes the difference in force between the two sides of the ball.
and the difference of force on both sides of the ball leads to turn its path
Things that control of Magnus effect
- The air resistance
- The shape of the ball surface
- The number of rotation ball
- The speed of ball
What happened to Roberto Carlos ' kick?
– The ball was 30 meters far from the goal.
– The ball moves at speeds of 25-30 meters per second.
– The ball rotates around itself 8-10 cycles in second.
– The force of Magnus becomes 3.5 Newton.
– The acceleration of the ball becomes 8 meters per second squared.
– The ball will deviate from its original path by 4 meters .
Finally, Magnus effect is not limited to football and sports such as golf, tennis, or baseball. It can even be used in dhows and scientists are trying to benefit on Magnus effect to make vehicles higher efficiency and less fuel-consuming .
------------- you have to training well to make a historic kick, as happened with Roberto
all image is free _source images : 1 2
In order to learn more about Magnus effect.. You can read the references
References:
- www.sciencealert.com: The Physics Behind This Crazy Basketball Trick
- physicsworld.com :The physics of football
- wikipedia : Magnus effect
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