But if you throw a baseball at the right speed with just a tiny bit of spin, the ball—and its famous red seams—rotates only slightly. This small rotation of the seams causes the ball to lose its stable lift. When the lift becomes unsteady, the ball lurches wackily. And that’s a knuckleball!

## What are the physics of a knuckleball?

But if you throw a baseball at the right speed with just a tiny bit of spin, the ball—and its famous red seams—rotates only slightly. This small rotation of the seams causes the ball to lose its stable lift. When the lift becomes unsteady, the ball lurches wackily. And that’s a knuckleball!

## Why does a knuckleball move football?

A knuckleball or knuckler is a baseball pitch thrown to minimize the spin of the ball in flight, causing an erratic, unpredictable motion. The air flow over a seam of the ball causes the ball to change from laminar to turbulent flow.

How fast is a knuckleball in soccer?

The releasing speed of knuckleballs is far below the maximal launching speed of baseballs observed in the field (105 mph ≃ 47 m s−1).

### Is knuckleball Magnus effect?

Knuckleballs. Lastly, a knuckleball, whether in soccer or baseball, is driven by the Magnus effect on a ball that is not spinning. Devoid of any spin, the ball becomes docile, surrendering itself to the whims of the forthcoming gust.

### What makes a knuckleball hard to hit?

What makes this pitch so hard to hit? A knuckleball is famously difficult to throw, hit and catch because of its erratic behavior. It seems to fly through the air with no spin and then break suddenly in any direction. The ball’s seams are key to this behavior.

Does a knuckleball actually move?

Examining data from 2011 games pitched by Dickey and retired knuckler Tim Wakefield, Nathan concluded that, contrary to the opinion of every batter who has faced a knuckleball, the ball follows a smooth trajectory. It doesn’t bob and weave suddenly; it just seems to.

## Who invented the knuckleball in soccer?

star Didi
The 1950s Brazilian star Didi invented the folha seca (dry leaf) which is nowadays commonly known as the knuckleball free kick, notably used by modern day players such as Juninho (whose technique has been emulated), and Cristiano Ronaldo, where the ball would be struck with either no or a low amount of spin, causing it …

## Did Ronaldo invent the knuckleball?

The 1950s Brazilian star Didi invented the folha seca (dry leaf) which is nowadays commonly known as the knuckleball free kick, notably used by modern day players such as Juninho (whose technique has been emulated), and Cristiano Ronaldo, where the ball would be struck with either no or a low amount of spin, causing it …

How do you shoot like a cr7?

To kick like Cristiano Ronaldo, practice popping the ball to a team mate by making contact with a straight foot and using a very short follow-through. You should also take the ball into the box and pop it into the air for a team mate to shoot or header in.

### Do knuckleballs move?

Its erratic and unpredictable movement, however, isn’t just hard to hit and catch—scientists have long puzzled over how the throw is even possible.

### What causes a ball to knuckle?

Researchers have found that an effect in the wake that the ball leaves behind it as it travels toward the batter creates the knuckling effect. (Inside Science) — A team of French researchers has examined what causes the knuckleball — in baseball and other sports — to move unpredictably late in flight.

What is a knuckleball in soccer?

A “knuckleball” in soccer refers to a ball kicked at very low spin, which results in a zigzag trajectory. Along its straight path, the ball deviates laterally by roughly the diameter of a ball (0.2 m). The deviation direction appears to be unpredictable, which is extremely frustrating for goalkeepers attempting to block it.

## Why study the physics of knuckleball?

“We decided to study the knuckleball because the physics of sports is such a new field and there are many discoveries to be made,” explains Caroline Cohen, a Ph.D. student at École Polytechnique’s Hydrodynamics Laboratory (LadHyX) in France.

## Do knuckleballs exist in other sports?

Though knuckleballs are most prominently seen in baseball, they also occur in sports like soccer and volleyball — yet are also strangely absent in games like table tennis, squash, and basketball. And in many of these sports, the balls lack seams or a high degree of asymmetry on the surface.

Why don’t we see knuckleballs in games of bocce?

By comparing the wavelength of the zigzag path with the typical shooting distance found in each sport, the researchers were able to account for why knuckleballs are not seen in games of bocce, handball or basketball.