# Alan Nathan

## POB

1. 1

### Freddie Garcia Splitter

30,388 views

Take a look at this high-speed .avi video of NYY Freddie Garcia throwing a split-fingered fastball from a game on April 29, 2011. Look particularly at how the ball is spinning and the direction of the break. For a normal Magnus effect on a spinning baseball, the ball breaks in the direction that the front edge of the ball is turning--in this case, to the pitcher's right. However, the ball actually breaks to the pitcher's left, presenting an interesting mystery.

UPDATE (2/9/2012): I have written an article that provides a possible explanation for the Garcia pitch. See http://www.hardballtimes.com/main/dispatch_article/dissectin­g-a-mystery-pitch/

2. 2

### Ball-Bat Scattering

707 views

High-speed video recorded at 2000 frames/s of a baseball bouncing off a bat. The baseball is projected from an air cannon at 120 mph and bounces off a wood cylinder, clamped to a rigid wall, to simulate a ball-bat collision. The center of the incident ball is purposely set above the centerline of the cylinder to simulate a batter undercutting the ball. As a result, the ball rebounds from the bat at an upward angle and with backspin. This experiment was carried out in December 2010 with the help of the good people at the Rawlings Equipment Corporation. The goal was to develop models of the ball-bat collision that will aid in determining the spin and rebound angle of batted baseballs.

3. 3

1,592,140 views

Want more awesome HD slow-mo? http://www.youtube.com/watch?v=uiyMuHuCFo4
How does a slinky fall when extended by its own weight and then released? We discover the surprising answer using a slow motion camera that records 300 frames per second. Answer link: http://www.youtube.com/watch?v=oKb2tCtpvNU

For a great explanation, check out Rhett Allain's analysis here: http://www.wired.com/wiredscience/2011/09/modeling-a-falling­-slinky/

4. 4

### Impact of Ball with Flexible Bat

771 views

In this video, I am striking a rubber bat at the tip of the barrel and watchign the subsequent motion with a high-speed camera (1200 frames/s). Note that there is a noticeable delay between when the ball strikes the barrel and the handle starts to move. The bat is not rigid and before the handle can move, the wave that is created at the handle has to propagate to the handle, which takes some time. In a real baseball-bat collision, the bat-ball contact time is about 1/1000 sec; the wave propagation time is also about 1/1000 sec. Therefore, nothing that is happening at the handle can affect the batted ball--not the hands, the arms, the grip, etc.

5. 5

208 views

Video taken from a Red Sox vs. Tampa Bay game on September 15, 2008. Note the third baseman Kevin Cash (normally a catcher) overruns the ball, which initially was headed toward the seats along the third baseline but then veers back towards the field. This is the quintessential paradoxical popup, indicative of a lot of backspin on the ball. Note also what happens to the ball when it hits the ground. The backwards bounce is further indication of large amount of backspin on the ball.

6. 6

### Ball-Bat Impact at Sweet Spot

839 views

Slow-motion video of ball-bat impact at the sweet spot of the bat. Note that after the ball leaves the bat, the bat continues on its smooth trajectory, with lower speed and no vibrations. The lower speed is the result of momentum conservation: The bat has transferred momentum to the ball, so the ball must transfer an equal and opposite momntum to the bat. If the bat were initially at rest, it would recoil backwards, just like firing a rifle. Since the bat is is initially moving forward, it continues forward but at lower speed.

7. 7

### Ball-Bat Impact Outside of Sweet Spot

556 views

Slow-motion video of the ball impact the bat near the tip of the barrel, which is farther out than the sweet spot. As a result, the bat starts to vibrate. In fact, the amplitude of the vibration is so severe it lifts the batter's bottom (left) hand off the bat.

8. 8

### Ball-Bat Impact Inside the Sweet Spot

406 views

Slow-motion video of the ball impact the bat near the label of the bat, which is closer to the hands than the sweet spot. As a result, the bat starts to vibrate. In fact, the amplitude of the vibration is so severe it lifts the batter's top (right) hand off the bat

9. 9

### Physics and Baseball: An Intersection of Passions

2,370 views

Examine the ways that a physicist analyzes the game of baseball: How does a baseball bat work? Why do aluminum bats outperform wood bats? Does corking the bat help? How much did that curveball break? Why can a curveball be hit farther than a fastball? Why are towering popups difficult to catch? Can steroid usage increase home run production?

Alan Nathan, Ph.D. is a Professor of Physics at the University of Illinois and a lifelong baseball fan. A Fellow of the American Physical Society, his research specialty is experimental nuclear/particle physics, with over 80 publications in scientific journals to his credit. He has also written numerous papers on baseball for scientific journals, primarily on the physics of the ball-bat collision and the aerodynamics of baseball.

10. 10

### Mariano Rivera Cutter: The Mechanics of His Signature Pitch

235,813 views

The closer Mariano Rivera has confounded hitters with mostly one pitch: his signature cutter.

Related Article: http://nyti.ms/d26t7R

11. 11

### Troy Tulowitzski's Double Hit

608 views

Watch this remarkable slo-mo video of Rockies' star Troy Tulowitzski hitting the ball twice. After the first impact, the ball barely dribbles off the bat. The barrel of the bat eventually catches up with the ball and impacts it for a second time, resulting in a clean single to left. Had the umpire realized that the ball was hit twice, Tulo would have been declared out.

12. 12

### LVS Cannon Demonstation

301 views

Demonstation of the LVS bat-testing cannon at Washington State University. A baseball is fired out of a cannon at speeds up to 150 mph and impacts a stationary bat. The ball bounces off the bat, which recoils backward. The speed of the incoming and outgoing ball are measured with light screens (the yellow panels in the video). The ratio of outgoing to incoming is used to measure the performance of the bat. The machine is the invention of Professor Lloyd Smith, Director of the Sport Science Laboratory at WSU.

13. 13

### Collision Between Baseball and Steel Plate

732 views

High-speed video (30,000 frames/s) of a baseball impacting and rebounding off a steel plate. The video was shot at the Baseball Research Center at the University of Massachusetts at Lowell. Note how the ball gets crushed upon impact. Note also that the rebound speed is only about half the incoming speed (so see this, simply see how much the ball advances between frames). In technical language, the ball has a "coefficient of restitution", or COR, which is only about 0.5. The crushing of the ball converts about 3/4 of the initial energy into heat, leaving less kinetic energy for the rebounding ball.

14. 14

### Softball-Bat Collision

321 views

High-speed video of bat vibrating after softball-bat collision. The data were taken as part of a swing speed study for men's slow-pitch softball, sponsored by the ASA. The data were taken and analyzed by Professor Lloyd Smith and his team from the Sports Sciences Laboratory at Washington State University. Note that the vibration is so severe that the batter's hand momentarily loses contact with the handle of the bat.

15. High-Speed Video of the Ball-Bat Collision
15

### Time Warp - Baseball bat

by Arturs Z 170,620 views

Time Warp @ Discovery HD - Baseball bat

16. Rod Cross's interview on the swing of a cricket ball and the movement of a baseball.
16

### How To Curve A Baseball Or Swing A Cricket Ball

190,159 views

In baseball and cricket the best pitchers and bowlers know how to make the ball move due to the effects of aerodynamics. If one side of the ball is rough, the ball swings towards that side because turbulent air 'clings' to that side of the ball and is deflected. Although baseballs and cricketballs appear symmetric, they can be made to fly through the air with a smooth or rough side by judicious angling of the seams combined with the axis of rotation.

17. 17

### The Physics of Baseball 2/11/2013

339 views

SCIENCE: Who thinks about the Physics of Baseball? You'll find out how important it is to America's pasttime! Learn more in this visit to the Corner of Main and Gervais!

18. 18

### The Physics of Baseball: "You Can Observe A Lot By Watching"

by C2ST TV 117 views

"You Can Observe A Lot By Watching" - Yogi Berra

Following Yogi's advice, Professor Emeritus of Physics at the University of Illinois Alan Nathan will use high-speed video clips to highlight some of the interesting physics underlying the game of baseball. The talk will focus on the subtleties of the baseball-bat collision, the intricacies of the flight of a baseball, and many other things. He will investigate some very practical questions and show how a physicist goes about trying to answer these questions.

Speaker:
Alan Nathan is Professor Emeritus of Physics at the University of Illinois. After a long career as an experimental nuclear physicist, he now spends his time researching the physics of the national pastime. He has written numerous papers on the subject for scientific journals, primarily on the physics of the ball-bat collision and the flight of a baseball. In addition, he has lectured on the subject to both scientific and popular audiences and maintains a frequently visited "physics of baseball" website, baseball.physics.illinois.edu. He sits by his phone each day hoping for a call from the Boston Red Sox.

19. 19

20. 20

### 10/30/13: Red Sox win third World Series since '04

by MLB 8,601 views

Daily Recap: Boston secured its third title since 2004 as Shane Victorino and the Red Sox tagged rookie Michael Wacha for six runs

Check out http://MLB.com/video for more!

About MLB.com: About MLB.com: Baseball Commissioner Allan H. (Bud) Selig announced on January 19, 2000, that the 30 Major League Club owners voted unanimously to centralize all of Baseball's Internet operations into an independent technology company. Major League Baseball Advanced Media (MLBAM) was formed and charged with developing, building and managing the most comprehensive baseball experience available on the Internet. In August 2002, MLB.com streamed the first-ever live full length MLB game. Since that time, millions of baseball fans around the world have subscribed to MLB.TV, the live video streaming product that airs every game in HD to nearly 400 different devices. MLB.com also provides fans with a stable of Club beat reporters, extensive historical information and footage, online ticket sales, official baseball merchandise, authenticated memorabilia and collectibles and fantasy games.
Baseball Commissioner Allan H. (Bud) Selig announced on January 19, 2000, that the 30 Major League Club owners voted unanimously to centralize all of Baseball's Internet operations into an independent technology company. Major League Baseball Advanced Media (MLBAM) was formed and charged with developing, building and managing the most comprehensive baseball experience available on the Internet. In August 2002, MLB.com streamed the first-ever live full length MLB game over the Internet when the Texas Rangers and New York Yankees faced off at Yankee Stadium. Since that time, millions of baseball fans around the world have subscribed to MLB.TV, the live video streaming product that airs every game in HD to nearly 400 different devices. MLB.com also provides an array of mobile apps for fans to choose from, including At Bat, the highest-grossing iOS sports app of all-time. MLB.com also provides fans with a stable of Club beat reporters and award-winning national columnists, the largest contingent of baseball reporters under one roof, that deliver over 100 original articles every day. MLB.com also offers extensive historical information and footage, online ticket sales, official baseball merchandise, authenticated memorabilia and collectibles and fantasy games.

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21. 21

### The Physics of Baseball: "You Can Observe A Lot By Watching"

by C2ST TV 117 views

"You Can Observe A Lot By Watching" - Yogi Berra

Following Yogi's advice, Professor Emeritus of Physics at the University of Illinois Alan Nathan will use high-speed video clips to highlight some of the interesting physics underlying the game of baseball. The talk will focus on the subtleties of the baseball-bat collision, the intricacies of the flight of a baseball, and many other things. He will investigate some very practical questions and show how a physicist goes about trying to answer these questions.

Speaker:
Alan Nathan is Professor Emeritus of Physics at the University of Illinois. After a long career as an experimental nuclear physicist, he now spends his time researching the physics of the national pastime. He has written numerous papers on the subject for scientific journals, primarily on the physics of the ball-bat collision and the flight of a baseball. In addition, he has lectured on the subject to both scientific and popular audiences and maintains a frequently visited "physics of baseball" website, baseball.physics.illinois.edu. He sits by his phone each day hoping for a call from the Boston Red Sox.

22. 22

### The Physics of Baseball 2/11/2013

339 views

SCIENCE: Who thinks about the Physics of Baseball? You'll find out how important it is to America's pasttime! Learn more in this visit to the Corner of Main and Gervais!