Do soccer balls and baseballs really turn laterally in mid-flight, or is it just an illusion
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Do soccer balls and baseballs really turn laterally in mid-flight, or is it just an illusion

[From: ] [author: ] [Date: 12-04-15] [Hit: ]
You can think of this as being a thin layer of air that is attached to the object. When a ball spins and moves through the air, this boundary layer detaches and alters the flow of air around the object. What you find is that this change in flow causes a force laterally and the ball curves.Professional pitchers in baseball can curve the ball up and down, and sideways depending on their grip and the spin they apply.......
Assuming low wind velocity (say, below 5 km/h) do sports balls such as soccer balls and baseballs really curve horizontally (laterally) in mid-flight? Or is it just a visual illusion?

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Yes, it's the result of the Magnus force.

Around every object in air (or other fluid) is a boundary layer. You can think of this as being a thin layer of air that is attached to the object. When a ball spins and moves through the air, this boundary layer detaches and alters the flow of air around the object. What you find is that this change in flow causes a force laterally and the ball curves.

Professional pitchers in baseball can curve the ball up and down, and sideways depending on their grip and the spin they apply.

Have a look at:

http://www.youtube.com/watch?v=6Bvz9jQHy…

to see this force in action in soccer.

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Although they don't turn sharp corners, soccer balls, baseballs, volleyballs, golf balls, and other sports balls can follow a curved path, even with no wind. The irregular surface of the ball and its spin can interact with air-resistance and cause it to break significantly.
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