Bowling ball

A bowling ball is a spherical ball made from plastic, reactive resin, urethane or a combination of these materials which is used in the sport of bowling. Ten-pin bowling balls generally have a set of three holes drilled in them, one each for the ring and middle finger, and one for the thumb; however, rules allow for up to five finger holes. They generally range from six pounds to 16 pounds in weight. The maximum limit allowed in tournaments or league games is 16 pounds, but balls of up to 20 pounds are available. A five-pin bowling ball has no finger holes and is smaller so that the bowler can hold the ball in the palm of his or her hand. Candlepin bowling balls also fit in the hand, but are slightly smaller and lighter than five-pin balls. Most bowling alleys provide free balls for patrons to use, called "house balls", although bowlers may purchase their own. These are often customized, and can feature specially sized finger holes (in the case of ten-pin balls) or monograms. Because purchased balls are usually drilled to match the owner's fingers, most can throw a customized bowling ball that is one to two pounds heavier than the house ball they previously used. Bowling balls come in many varieties of colors, and are often either a single flat color, a swirl-like design of multiple colors, gray or a single color with an iridescent look. It is even possible to obtain transparent bowling balls, some are even made white the clear polyester or plastic shell with a small object inside of them for a distinctive look. These objects look to be rather large but are in fact a lot smaller outside of the ball. Some objects have included skulls, footballs, and small bowling pins. Inside the ball is a core which is dynamically imbalanced to cause the ball to try to stabilize as it is rolling down th

lane. This makes the ball roll over a different point on the surface every time it revolves and "flares" or causes multiple rings of oil as it travels down the lane. Bowling ball cores are constructed with different densities as well. Some are center heavy (low rg) and some cores are made with the weight distributed more towards the cover of the ball (high rg). Low rg balls will spin more easily than the high rg balls. USBC and FIQ regulation ten-pin bowling balls must weigh no more than 16 pounds (7.3 kg) (governing bodies do not regulate how light a bowling ball may be), have absolutely no metallic component materials used anywhere in their makeup, and have a maximum circumference of 27 inches (69 cm) directly in the equipment rules for tenpin bowling, which results in a maximum diameter of 8.59 inches (21.8 cm). The lightest ball generally available is the 6-pound (2.7 kg) weight, which is generally used by children. Ball weights between 12 and 16 pounds (5.4 and 7.3 kg) are common in adult league play. Since the physical dimensions of regulation balls remain the same, while the weight may differ, lighter balls are much less dense than heavier ones. Thus, balls under about 11 pounds will float when placed in water. The behavior of a rolling ball on a surface is controlled by several factors, the most obvious being the bowler's delivery. In the delivery, the bowler can use or fight (intentionally or unintentionally) the force of gravity. After the ball is on the surface of the lane, friction, gyroscopic inertia, and gravity all become factors. These environmental influences can be segregated as either lane conditions or ball characteristics. Additionally, a bowling ball is not an absolutely uniform spherethe gripping holes (and sometimes a balance hole) alone make that impossible.