AY Honors/Ultimate Disc/Answer Key

2007-01-20T15:22:04Z

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[[Image:frisbee-1.jpg|thumb|200px|right|A [[Wham-O]] Professional Frisbee]]

{{redirect1|Frisbee|the amusement ride|[[Frisbee (ride)]]}}

'''Flying discs''' (commonly called '''Frisbees''') are the general name for any number of discs which are generally [[plastic]], roughly 20 to 25 centimeters (8–10 inches) in [[diameter]], with a lip. The shape of a disc, an [[airfoil]] in cross-section, allows it to [[flight|fly]] by generating [[lift (force)|lift]] as it moves through the air while rotating. The name Frisbee is a registered [[trademark]] of the [[Wham-O]] toy company, but is often used [[genericized trademark|generically]] to describe all versions of the flying disc.

Flying discs are thrown and caught for [[recreation]], and as part of many different [[flying disc games]]. A wide range of flying disc variants are available commercially. [[Disc golf]] discs are usually smaller but denser and are tailored for particular flight profiles to increase/decrease stability and distance. [[Disc dog]] sports use relatively slow flying discs made of more pliable material to better resist a dog's bite and prevent injury. Ring shaped discs, known as [[Aerobie]]s, typically fly significantly farther than any traditional flying disc. There are illuminated discs meant for night time play which use [[Phosphorescence|phosphorescent]] plastic, or battery powered [[light-emitting diode|light emitting diodes]].

==History==

People have been throwing cake pans, pie tins, cookie jar lids, and other such objects for centuries. The earliest known disc object to be thrown around was the [[chakram]], which was used as a weapon in [[History of India|ancient India]]. In later times, flying discs were used for recreational purposes. The [[clay target]] used in [[trapshooting]], almost identical to a flying disc in shape, was designed in the 19th century. The modern day era of flying discs began with the concept of designing and selling a commercially-produced flying disc.

In 2006, [[Walter Frederick Morrison|Fred Morrison]] co-authored ''Flat Flip Flies Straight!'' with flying disc historian and collector Phil Kennedy. In the book Fred reveals that it was a popcorn can lid that he tossed with his girlfriend (and later wife) Lu at a 1937 Thanksgiving Day gathering in Los Angeles, CA that inspired his interest in developing a commercially-produced flying disc. In 1946 he sketched out plans for a disc he called the "Whirlo-Way," which in 1948, co-developed and financed by [[Warren Franscioni]], became the very first plastic flying disc—the original PIPCO FLYIN-SAUCER. However, that disc was largely unsuccessful. In 1955 Fred, with help from Lu, designed and molded a brand new disc— the PLUTO PLATTER — which he then sold to Wham-O on January 23, 1957. In 1958 Wham-O renamed it the "FRISBEE," possibly a [[misspelling]] of the name of the [[Frisbie Pie Company]] of [[Bridgeport, Connecticut]], and then trademarked the name Frisbee.

==Games using flying discs==
{{main|Flying disc games}}
*[[Ultimate (sport)|Ultimate]]
*[[Freestyle frisbee]]
*[[Disc Golf]] - the traditional game of [[Golf]] played with flying discs (frisbees) instead of clubs and balls.
*[[Durango Boot]]
*[[DDC Frisbee|Double Disc Court]]
*[[Guts frisbee|Guts Frisbee]]
*[[Flutterguts]]
*[[Friskee]]
*[[Disc dog]]
*[[Dodge Frisbee]]
*[[Goaltimate]]
*[[Schtick (Disc Game)|Schtick]]
*[[Fricket]], (sometimes called Cups, Suzy Sticks, Frisnok or Disc Cricket)
*[[Hot Box]]
*[[Fris-Nok]], the traditional Icelandic-Canadian game.
*[[Flyer Frizbee]]

==Physics==

[[Lift (force)|Lift]] is generated in primarily the same way as a traditional asymmetric [[airfoil]], that is, by accelerating upper airflow such that a pressure difference gives rise to a lifting force. Small ridges near the leading edge act as turbulators, reducing flow separation by forcing the airflow to become [[turbulent]] after it passes over the ridges.

The rotating flying disc has a vertical [[angular momentum]] vector, stabilizing its attitude  [[gyroscope|gyroscopically]]. Depending on the cross-sectional shape of the airfoil, the amount of lift generated by the front and back parts of the disc may be unequal. If the disc was not spinning, this would tend to make it [[Flight dynamics|pitch]]. When the disc is spinning, however, such a torque would cause it to [[precession|precess]] about the roll axis, causing its trajectory to curve to the left or the right. Most discs are designed to be aerodynamically stable, so that this roll is self-correcting for a fairly broad range of velocities and rates of spin. However, many [[disc golf]] discs are intentionally designed to be unstable. Higher rates of spin lead to better stability, and for a given rate of spin, there is generally a range of velocities that are stable.

Even a slight deformation in a disc, called a "Taco," as extreme cases look like a [[taco shell]], can cause adverse affects when throwing long range. It can be observed by holding the disc horizontally at eye level and looking at the rim while slowly rotating the disc.

==Trivia==
*In the animated motion picture ''[[The Secret of NIMH]]'', based on the book ''[[Mrs. Frisby and the Rats of NIMH]]'', the main character's name was changed in post-production from "Frisby" to "Brisby" to avoid potential trademark infringements.
*In the film ''[[Back to the Future Part III]]'', Marty McFly throws a metal pie dish at a gunman in order to save Doc Brown's life. He notices the dish is stamped "Frisbie Pie Company", giving a fictional origin to the current use of the term.
*[[Richard Feynman]] in his book ''[[Surely You're Joking, Mr. Feynman!]]'' suggests that watching the wobble of a plate tossed in the [[Cornell University]] cafeteria stimulated him to develop mathematics that eventually led to his Nobel prize winning work in [[quantum electrodynamics]] [http://www.washingtonpost.com/wp-dyn/content/article/2005/11/03/AR2005110301924.html].

== See also ==
* [[Disc throws]]
* [[Frisbeetarianism]]
* [[Chakram]]

==Further reading==

*''Flat Flip Flies Straight! True Origins of the Frisbee®'' [[Walter Frederick Morrison]] and Phil Kennedy, Wormhole Publishers, Wethersfield, CT (June 2006), ISBN 978-0-9774517-4-6
*''Frisbee, A Practitioner's Manual and Definitive Treatise'' Stancil E.D. Johnson, M.D. Workman Publishing Company, New York (July, 1975) ISBN 978-0-911104-53-0
*''The Official Frisbee Handbook'' Goldy Norton, Bantam Books, Toronto/New York/London (July, 1972) no ISBN
*''Frisbee Players' Handbook'' Mark Danna, Dan Poynter, Parachuting Publications, Santa Barbara, California (1978) ISBN 0915516195
*''Frisbee Sports & Games'' Charles Tips, Dan Roddick, Celestial Arts, Millbrae, California (March 1979) ISBN 978-0-89087-233-8
*''Frisbee by the Masters'' Charles Tips, Celestial Arts, Millbrae, California (March 1977) ISBN 978-0-89087-142-3
*''Spinning Flight : Dynamics of Frisbees, Boomerangs, Samaras and Skipping Stones'', Ralph Lorenz, Copernicus New York, September 2006 ISBN 978-0-387-30779-4

==External links==
*[http://www2.upa.org/index.php/ Ultimate Players Association] sports governing body of Ultimate in the USA
*[http://www.freestyledisc.org Freestyle Players Association] sports governing body of Freestyle Frisbee in the world
*[http://www.wfdf.org World Flying Disc Federation] international sports governing body for all
*[http://www.frisbeedisc.com/ Wham-O Frisbee disc website] manufacturer of Frisbee brand flying discs
*[http://www.ukultimate.com/ UK Ultimate Association]
*[http://www.hamfrisbee.blogspot.com]

[[Category:Frisbee]]
[[Category:National Toy Hall of Fame]]
[[Category:Toys]]
[[Category:Flying disc games]]
[[Category:Wham-O brands]]

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[[uk:Фрісбі]]

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AY Honors/Ultimate Disc/Answer Key