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Gridiron Football
Gridiron football,"Gridiron football" ''Encyclopædia Britannica''. Retrieved October 20, 2010. also known as North American football or, in North America, simply football, is a family of football team sports primarily played in the United States and Canada. American football, which uses 11 players, is the form played in the United States and the best known form of gridiron football worldwide, while Canadian football, which uses 12 players, predominates in Canada. Other derivative varieties include arena football, flag football and amateur games such as Touch football (American), touch and street football (American), street football. Football is played at professional gridiron football, professional, college football, collegiate, High school football, high school, semi-professional, and amateur levels. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Football Helmet
The football helmet is a piece of protective equipment used mainly in gridiron football, although a structural variation has occasional use in Australian rules football. It consists of a hard plastic shell with thick padding on the inside, a face mask made of one or more plastic-coated metal bars, and a chinstrap. Each position has a different type of face mask to balance protection and visibility, and some players add polycarbonate visors to their helmets, which are used to protect their eyes from glare and impacts. Helmets are a requirement at all levels of organized football, except for non-tackle variations such as flag football. Although they are protective, players can and do still suffer head injuries such as concussions. Football helmets have changed dramatically with the modernization of the sport to facilitate technological changes and to improve the safety of the game. Despite lower rates of some injuries, serious traumas to the head are still common, and determini ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Nebraska Press
The University of Nebraska Press, also known as UNP, was founded in 1941 and is an academic publisher of scholarly and general-interest books. The press is under the auspices of the University of Nebraska–Lincoln, the main campus of the University of Nebraska system. UNP publishes primarily non-fiction books and academic journals, in both print and electronic editions. The press has particularly strong publishing programs in Native American studies, Western American history, sports, world and national affairs, and military history. The press has also been active in reprinting classic books from various genres, including science fiction and fantasy. Since its inception, UNP has published more than 4,000 books and 30 journals, adding another 150 new titles each year, making it the 12th largest university press in the United States. Since 2010, two of UNP's books have received the Bancroft Prize, the highest honor bestowed on history books in the U.S. History UNP began in Novem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Football Diagram 1904
Football is a family of team sports that involve, to varying degrees, kicking a ball to score a goal. Unqualified, the word ''football'' normally means the form of football that is the most popular where the word is used. Sports commonly called ''football'' include association football (known as ''soccer'' in North America and Australia); gridiron football (specifically American football or Canadian football); Australian rules football; rugby union and rugby league; and Gaelic football. These various forms of football share to varying extent common origins and are known as "football codes". There are a number of references to traditional, ancient, or prehistoric ball games played in many different parts of the world. Contemporary codes of football can be traced back to the codification of these games at English public schools during the 19th century. The expansion and cultural influence of the British Empire allowed these rules of football to spread to areas of British inf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Football Canada
Football Canada is the governing body for amateur gridiron football in Canada headquartered in Ottawa, Ontario. Football Canada focuses primarily its own Canadian form of the sport, and is currently the world's only national governing body for Canadian football. The governing body is also Canada's representative member of the International Federation of American Football (IFAF), the world's governing body for American football. In this capacity, it organizes the Canadian men's national football team which competes in IFAF competitions using American rules. History 1880–1955, Canadian Rugby Union The organization, which is now known as Football Canada, was founded on June 12, 1880, as the Canadian Rugby Football Union, revived on February 7, 1884, and re-organized as the Canadian Rugby Union on December 19, 1891. The CRU was founded to govern a sport which at the time had rules similar to the rugby football being played in the United Kingdom. In 1909, Albert Grey, 4th Earl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Federation Of American Football
The International Federation of American Football (IFAF) is the international governing body of gridiron associations. The IFAF oversees the IFAF World Championship of American Football, which is held every four years. The IFAF became a provisionary member of SportAccord in 2003, and became a full SportAccord member in 2005. The organisation's head office is located in the French commune of La Courneuve, in the Île-de-France region. Structure and organization The IFAF recognizes in their respective areas the following branches and have 120 members as of May 2022: * IFAF Africa : 17 * IFAF Americas : 23 * IFAF Asia : 30 * IFAF Europe : 42 (European Championship of American football) * IFAF Oceania : 8 Members Top competitions World * Senior Men's World Championship (Men), every four years. * Senior Women's World Championship (Women), every four years. * Under-19 World Championship (Men), every four years. * Senior Men's Flag Football World Championship (Men), every two ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prolate Spheroid
A spheroid, also known as an ellipsoid of revolution or rotational ellipsoid, is a quadric surface obtained by rotating an ellipse about one of its principal axes; in other words, an ellipsoid with two equal semi-diameters. A spheroid has circular symmetry. If the ellipse is rotated about its major axis, the result is a ''prolate spheroid'', elongated like a rugby ball. The American football is similar but has a pointier end than a spheroid could. If the ellipse is rotated about its minor axis, the result is an ''oblate spheroid'', flattened like a lentil or a plain M&M. If the generating ellipse is a circle, the result is a sphere. Due to the combined effects of gravity and rotation, the figure of the Earth (and of all planets) is not quite a sphere, but instead is slightly flattened in the direction of its axis of rotation. For that reason, in cartography and geodesy the Earth is often approximated by an oblate spheroid, known as the reference ellipsoid, instead of a sphere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ball (gridiron Football)
In Canada and the United States, a football (also called a pigskin) is a ball, roughly in the form of a prolate spheroid, used in the context of playing gridiron football. Footballs are often made of cowhide leather, as such a material is required in professional and collegiate football. Footballs used in recreation, and in organized youth leagues, may be made of rubber, plastic or composite leather (high school football rule books still allow inexpensive all-rubber footballs, though they are less common than leather). History Early balls In the 1860s, manufactured inflatable balls were introduced through the innovations of English shoemaker Richard Lindon. These were much more regular in shape than the handmade balls of earlier times, making kicking and carrying easier. These early footballs were plum-shaped. Some teams used to have white footballs for purposes of night practice. The football changed in 1934, with a rule change that tapered the ball at the ends more and redu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metrication In Canada
Metrication in Canada began in 1970 and ceased in 1985. While Canada has converted to the metric system for many purposes, there is still significant use of non-metric units and standards in many sectors of the Canadian economy and everyday life today. This is mainly due to historical ties with the United Kingdom, the traditional use of the imperial system of measurement in Canada, proximity to the United States, and strong public opposition to metrication during the transition period. Before conversion Until the 1970s, Canada traditionally used the imperial measurement system, labelled as "Canadian units of measurement" under Schedule II of the ''Weights and Measures Act'' (R.S., 1985, c. W-6). These units have the same names and the same values as United States customary units, with the exception of capacity measures such as the gallon. For example, before metrication in Canada, gasoline was sold by the (imperial) gallon (about 4.55 litres). In cross-border transactions with the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yard (unit)
The yard (symbol: yd) is an English unit of length in both the British imperial and US customary systems of measurement equalling 3 feet or 36 inches. Since 1959 it has been by international agreement standardized as exactly 0.9144 meter. A distance of 1,760 yards is equal to 1 mile. The US survey yard is very slightly longer. Name The term, ''yard'' derives from the Old English , etc., which was used for branches, staves and measuring rods. It is first attested in the late 7th century laws of Ine of Wessex, where the "yard of land" mentioned is the yardland, an old English unit of tax assessment equal to hide. Around the same time the Lindisfarne Gospels account of the messengers from John the Baptist in the Gospel of Matthew used it for a branch swayed by the wind. In addition to the yardland, Old and Middle English both used their forms of "yard" to denote the surveying lengths of or , used in computing acres, a distance now usually ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Football Positions
In American football, the specific role that a player takes on the field is referred to as their "position". Under the modern rules of American football, both teams are allowed 11 players on the field at one time and have "unlimited free substitutions", meaning that they may change any number of players during any "dead ball" situation. This has resulted in the development of three task-specific "platoons" of players within any single team: the offense (the team with possession of the ball, which is trying to score), the defense (the team trying to prevent the other team from scoring, and to take the ball from them), and the so-called 'special teams' (who play in all kicking situations). Within these three separate "platoons", various positions exist depending on the jobs that the players are doing. Offense In American football, the offense is the team that has possession of the ball and is advancing toward the opponent's end zone to score points. The eleven players of the offen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
