Physics of a Spinning Football's Trajectory
Chapter 1

Falling with style

Chapter 2

Nature's master marksmen

Chapter 3

Dancing through the cosmos

Chapter 4

The spin and the curve

YOUR GOAL

Master of The wild paths of things in flight

Ch 4 · The spin and the curve
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007skaty Roberto Carlos scored an impossible free kick using intense ball spin.

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007skaty The Magnus Effect

Spin it fast to drag the wind, and the low pressure curves the path.

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Stability in the face of resistance requires continuous motion.

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007skaty The physics of a spinning football

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The stable trajectory of a spinning football

007skaty Quarterbacks throw spiral passes to align the ball's tip with its trajectory, minimizing air resistance and preventing drag

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Roberto Carlos and the impossible free kick

007skaty A curved line traces the impossible trajectory of Roberto Carlos's soccer kick.

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The Whirly Curve
BETA

007skaty Flick the spinning disc to discover how wind and gravity curve its trajectory.

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Fun Fact

Frisbee physics: The world record for the longest throwing toy trajectory is an Aerobie disc throw of 406 meters.

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Glossary
magnus effect (noun)
A physical phenomenon in which a spinning object moving through a fluid experiences a sideways force that deflects its path. Heinrich Gustav Magnus first analyzed this force in 1853 to explain why spinning projectiles curve in flight.

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Gossip

Which curving sports trick is hardest?

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Quiz

What is the scientific name for the phenomenon where a spinning ball curves in flight?

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007skaty The Magnus effect makes spinning objects curve through the air

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Quiz

What would happen to an American football thrown without any spiral spin?

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007skaty Aerodynamic forces drive the returning flight of the boomerang.

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Quiz

Why do quarterbacks throw American footballs with a tight spiral spin?

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Quiz

What famous soccer player scored an 'impossible' curving free kick against France in 1997?

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Quiz

Why does a returning boomerang fly in a circular path instead of straight?

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Quiz

How do the curved wings of a returning boomerang generate lift?

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Quiz

Who first mathematically explained the physics of spinning projectiles in 1852?

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Quiz

How does spin affect the air pressure on either side of a moving ball?

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