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:
... the paradoxical decomposition of S2 then yields a paradoxical decomposition of the solid unit ball minus the point at the ball's centre (this center ... 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) ...
... which states the following Given a solid ball in 3‑dimensional space, there exists a decomposition of the ball into a finite number of non-overlapping pieces (i.e ... way to yield two identical copies of the original ball ... "reasonable" solid objects (such as a small ball and a huge ball), either one can be reassembled into the other ...
... 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 ...
... 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 ...
... the tiny seam which runs around a cricket ball at 90 degrees to the large, raised seam ... at' - 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 ... the quarter seam during an over alters the balance of air pressure surrounding the ball as it travels through the air and help it reverse ...
More definitions of "ball":
- (verb): Form into a ball by winding or rolling.
Example: "Ball wool"
- (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 pitch that is not in the strike zone.
Example: "He threw nine straight balls before the manager yanked him"
- (noun): A solid ball shot by a musket.
Example: "They had to carry a ramrod as well as powder and ball"
Synonyms: musket ball
- (noun): One of the two male reproductive glands that produce spermatozoa and secrete androgens.
Synonyms: testis, testicle, orchis, ballock, bollock, nut, egg
- (noun): United States comedienne best known as the star of a popular television program (1911-1989).
Synonyms: Lucille Ball
- (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): The people assembled at a lavish formal dance.
Example: "The ball was already emptying out before the fire alarm sounded"
- (noun): A lavish formal dance.
- (noun): A spherical object used as a plaything.
Example: "He played with his rubber ball in the bathtub"
- (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"
Famous quotes containing the word ball:
“I dont like comparisons with football. Baseball is an entirely different game. You can watch a tight, well-played football game, but it isnt exciting if half the stadium is empty. The violence on the field must bounce off a lot of people. But you can go to a ball park on a quiet Tuesday afternoon with only a few thousand people in the place and thoroughly enjoy a one-sided game. Baseball has an aesthetic, intellectual appeal found in no other team sport.”
—Bowie Kuhn (b. 1926)
“The world was a huge ball then, the universe a might harmony of ellipses, everything moved mysteriously, incalculable distances through the ether.
We used to feel the awe of the distant stars upon us. All that led to was the eighty-eight naval guns, ersatz, and the night air-raids over cities. A magnificent spectacle.
After the collapse of the socialist dream, I came to America.”
—John Dos Passos (18961970)
“Throw down the ball, ye Jews daughter,
Throw down the ball to me!
Never a bit, says the Jews daughter,
Till up to me come ye.”
—Unknown. Hugh of Lincoln (l. 1316)