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The USBC and World Bowling promulgate bowling ball specifications. USBC specifications include physical requirements for weight (≤16 pounds (7.3 kg)), diameter (8.500 inches (21.59 cm)—8.595 inches (21.83 cm)), surface hardness, surface roughness, hole drilling limitations (example: a single balance hole including the thumb hole for "two-handed" bowlers [3]), balance, plug limitations, and ...
Bowling balls vary, depending on the type of bowling. Ten-pin balls are about 8.59 inches (21.8 cm) in diameter, typically have three holes, and weigh from 6 to 16 lb (2.7 to 7.3 kg). The size and spacing of the finger holes on non-customized balls are generally smaller on lighter balls to accommodate smaller hands.
1.0 kg⋅m (9.8 N⋅m; 7.2 lb⋅ft) kg.m Nm; kg.m lb.ft; Imperial & US customary: pound force-foot: lb.ft lb⋅ft 1.0 lb⋅ft (1.4 N⋅m) lb.ft Nm; lb.ft kg-m; Scientific: SI: newton-metre: N.m N⋅m Triple combinations are also possible. See the full list. 1.0 N⋅m (0.74 lbf⋅ft) N.m kgf.m; N.m lbf.ft; Non-SI metric: kilogram force-metre ...
In bowling, we are trying to deliver a heavy 14 or 15 pound bowling ball over the foul line at about an average speed of 16 or 17 miles per hour, apply a rotational force to the ball in order to gain an effective hook motion, hit a one inch sighting target on the lane, and accurately impact the pocket 60 feet away while smashing down about 36 ...
(For younger or novice players, the ball is 14 cm (5.5 in) and weighs 1.9 kg (4.2 lb).) Unlike the ball used for ten-pin bowling, but like the ones used for other "small-ball" forms of bowling such as five-pin, candlepin and duckpin, the nine-pin ball has no finger holes, although there are also special balls with two finger holes designed for ...
The balls are biased in the same way as the lawn bowls balls but with a diameter of about 20 cm (7.9 in), a thickness of 12 cm (4.7 in) and a weight of about 2 kg (4.4 lb), they are a bit bigger than usual bowls. The target is an unmovable feather or metal plate on the ground, instead of a small ball.