A ball is a round, usually spherical but sometimes ovoid, object with various uses. It is used in ball games, where the play of the game follows the state of the ball as it is hit, kicked or thrown by players. Balls can also be used for simpler activities, such as catch, marbles and juggling. Balls made from hard-wearing materials are used in engineering applications to provide very low friction bearings, known as ball bearings. Black powder weapons use stone and metal balls as projectiles.
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Some articles on ball:
... in set-theoretic geometry which states the following Given a solid ball in 3‑dimensional space, there exists a decomposition of the ball into a finite number of ... yield two identical copies of the original ball ... any two "reasonable" solid objects (such as a small ball and a huge ball), either one can be reassembled into the other ...
... Computed tomography of a football (soccer) (Video) Baoding balls Baseball Basketball Billiard balls Bowling ball (and pin) Lacrosse ball Cricket ball Golf ball next to a hole Rugby union ...
... then yields a paradoxical decomposition of the solid unit ball minus the point at the ball's centre (this center point needs a bit more care, see below) ... However, there are only countably many such points, and like the point at the centre of the ball, it is possible to patch the proof to account for them all (see below) ...
... The Quarter seam is the tiny seam which runs around a cricket ball at 90 degrees to the large, raised seam ... loosening the threads - in order to create conventional swing when the ball is relatively new, more recently, an understanding has evolved that the quarter seam can be lifted on one side, presumably ... an over alters the balance of air pressure surrounding the ball as it travels through the air and help it reverse ...
... Using the Banach–Tarski paradox, it is possible to obtain k copies of a ball in the Euclidean n-space from one, for any integers n ≥ 3 and k ≥ 1, i.e ... a ball can be cut into k pieces so that each of them is equidecomposable to a ball of the same size as the original ... These results then extend to the unit ball deprived of the origin ...
More definitions of "ball":
- (noun): A solid ball shot by a musket.
Example: "They had to carry a ramrod as well as powder and ball"
Synonyms: musket ball
- (verb): Form into a ball by winding or rolling.
Example: "Ball wool"
- (noun): The people assembled at a lavish formal dance.
Example: "The ball was already emptying out before the fire alarm sounded"
- (noun): A spherical object used as a plaything.
Example: "He played with his rubber ball in the bathtub"
- (noun): A ball game played with a bat and ball between two teams of 9 players; teams take turns at bat trying to score run.
Example: "There was a desire for National League ball in the area"; "play ball!"
Synonyms: baseball, baseball game
- (noun): A more or less rounded anatomical body or mass; ball of the human foot or ball at the base of the thumb.
Example: "He stood on the balls of his feet"
- (noun): A compact mass.
Example: "A ball of mud caught him on the shoulder"
Synonyms: clod, glob, lump, clump, chunk
- (noun): A lavish formal dance.
- (noun): Round object that is hit or thrown or kicked in games.
Example: "The ball travelled 90 mph on his serve"; "the mayor threw out the first ball"; "the ball rolled into the corner pocket"
- (noun): One of the two male reproductive glands that produce spermatozoa and secrete androgens.
Synonyms: testis, testicle, orchis, ballock, bollock, nut, egg
- (noun): A pitch that is not in the strike zone.
Example: "He threw nine straight balls before the manager yanked him"
Famous quotes containing the word ball:
“Lifes like a ball game. You gotta take a swing at whatever comes along before you wake up and find out its the ninth inning.”
—Martin Goldsmith, and Edgar G. Ulmer. Vera (Ann Savage)
“Dont tell me what delusion he entertains regarding God, or what mountebank he follows in politics, or what he springs from, or what he submits to from his wife. Simply tell me how he makes his living. It is the safest and surest of all known tests. A man who gets his board and lodging on this ball in an ignominious way is inevitably an ignominious man.”
—H.L. (Henry Lewis)
“Life ... is not simply a series of exciting new ventures. The future is not always a whole new ball game. There tends to be unfinished business. One trails all sorts of things around with one, things that simply wont be got rid of.”
—Anita Brookner (b. 1928)