Frisbees

Ewald

History

• Invented by Walter Frederick Morrison• Early model called “Pluto Platter”• Wham-O began selling them in 1957• Over 200 million have been sold since

then

How do they fly?• Bernoulli Principle–More air pressure under than on top causes lift– Same principle that gives airplanes lift

• Newton’s Third Law– Frisbee forces air down, air pushes back up on

Frisbee– Angle of Frisbee directs air down and keeps

Frisbee up

Angular Momentum

• Rotating body’s resistance to change in orientation and rate of rotation

• In Frisbees, what keeps them stable• Faster it is thrown, more stable it is

Impact

• Kids are outside more• College campus’ are able to create perfect

pictures of their school quad thanks to the Frisbee

References• "Frisbee." St. James Encyclopedia of Popular Culture. 5 vols. St. James Press, 2000.

Reproduced in History Resource Center. Farmington Hills, MI: Gale. http://galenet.galegroup.com/servlet/HistRC/

• Vargas, Colby. "Frisbee." St. James Encyclopedia of Popular Culture. Ed. Sara Pendergast and Tom Pendergast. Vol. 2. Detroit: St. James Press, 2000. 174. Gale Virtual Reference Library. Web. 17 Feb. 2010.

• Kever, J. (n.d.). Frisbee flies into the 21st century. Chron.com - Houston Chronicle. Retrieved February 18, 2010, from http://www.chron.com/disp/story.mpl/life/4840419.html

• Physics of a Frisbee. (n.d.). The Wellington School. Retrieved February 18, 2010, from http://www.wellington.org/miller/How%20the%20Frisbee%20Flies.htm

• Portland Ultimate Frisbee, it’s all about the spirit.. (n.d.). Relocation to Portland. Retrieved February 18, 2010, from http://relocationtoportland.com/2008/12/17/portland-ultimate-frisbee/

• Quad Frisbee on Flickr - Photo Sharing!. (n.d.). Welcome to Flickr - Photo Sharing. Retrieved February 18, 2010, from http://www.flickr.com/photos/tatiad/288102680/