The Physics
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Diameter of a Bowling Ball

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Bibliographic Entry Result
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Serway, Raymond. Physics for Scientists and Engineers, with Modern Physics. Brooks/Cole Publishing Company; 5th Edition, 1999: 338. "A typical bowling ball might have a mass of 8 kg and a radius of 12 cm." 24 cm

Professional Bowlers Association Membership Guide and Rules and Regulations [pdf]. 15 October 2007: 62.

"The circumference of a ball may not exceed twenty-seven (27) inches. The ball diameter must remain constant." 21.83 cm
Ottwell, Guy. The Thousand Yard Model or the Earth as a Peppercorn. London: Universal Workshop, 1989 "A standard bowling ball happens to be just 8 inches wide, and makes a nice massive Sun, so I couldn't resist putting it in the picture." 20.32 cm
Bowling Balls and Bowling Equipment. "Regulation bowling balls are 8 ½ inches in diameter and weigh 8 to 16 pounds." 21.59 cm

What are the Different Types of Bowling Balls?

"Ten-pin bowling balls are typically eight and a half inches in diameter and contain three finger holes. Five-pin bowling balls on the other hand, have no finger holes and are five inches in diameter." 21.59 cm
12.7 cm
Skittles, Nine Pines. The Online Guide to Traditional Games. "The discus-shaped cheese, too, is enormous varying from 8 ½ to 12 inches in diameter and weighing between nine and twelve pounds but none-the-less, the cheeses are thrown in order that they hit the skittles directly without touching the floor first." 21.59-30.48 cm

Even though baseball is known as the national pastime in the United States, more people go bowling than go to baseball games. Bowling is a year-round sport in which players roll a ball down a long, narrow lane and try to knock down a group of pins. There are several variations of bowling, but the most common form is known as tenpins. In this game, ten pins stand in a triangular pattern at the end of the alley. A game consists of ten frames and the bowler who knocks down the most pins is the winner. In each frame, a bowler has two chances to knock down all ten pins. If the all the pins go down on the first try, the bowler scores a strike. If the bowler knocks them all down within two tries, the person scores a spare. If the ball falls into the gutter before reaching the pins, the bowler scores nothing. This is called a gutter ball. The ball for this game cannot exceed 21.8 cm in diameter.

Nine-pin bowling is the oldest kind of bowling and is very similar to ten-pin bowling. It is also referred to as Skittles. Skittles differs from ten-pin bowling in that knocking over the nine pins counts as a strike, not a spare. This game also has variations according to the region. It is most common in Austria, Switzerland, Serbia, Slovenia, Croatia, Hungary, and Liechtenstein. The ball for this game ranges from 21.6 cm to 30.5 cm in diameter.

Canadians created their own game, called five-pin bowling, in 1909. It was created to quicken the pace of the bowling game so it could fit into a lunch break. Each pin has a point value ranging from two to five depending on its position. A player has three chances to knock the pins over in each frame. A rubber band is placed around the throat of each pin, allowing more pins to be knocked down. Five-pin bowling balls do not have finger holes and are smaller. The ball used in this game is 12.7 cm in diameter.

Marwa Elfa -- 2009