W o is the initial rotation speed (angular velocity) of the bowling ball. The orientation of this axis depends entirely on the bowler's release technique.
The PAP is the initial axis of rotation of the bowling ball as soon as it begins traveling down the lane. These directly relate to the physics of bowling and are shown in the figure below. In addition to the pins, two other points of interest on a bowling ball are the Positive Axis Point (PAP) and the CG point. However, the physics of bowling is very similar whether the weight block is symmetric or asymmetric. This will be explained in more detail later on, as the physics of bowling is discussed in greater depth.īowling balls with symmetric and asymmetric weight blocks result in similar performance, but bowling balls with an asymmetric weight block allow for a bit more "tweaking" to get the ball to react a certain way when in motion. The pins give important information on where to drill the finger and thumb holes of the bowling ball so that the bowler can control the spin and curve of the ball, in order to make the best possible shot.
A symmetric weight block only needs a single pin to define its orientation inside the bowling ball, but an asymmetric weight block needs two pins to define its orientation (due to its non-symmetry). The pins allow one to determine the orientation of the weight block inside the bowling ball. This is simply a different naming convention in bowling terminology. The "PSA indicator pin" is also called the "mass bias" location. These two pins are located 90° from each other. And due to its non-symmetry, a "PSA indicator pin" is placed on the side of the weight block, at the point (or area) closest to the outside surface of the bowling ball. However, an asymmetric weight block is not symmetric with respect to angle θ. Just like the symmetric weight block, the "pin" represents the top position of the asymmetric weight block.
The figure below shows the cross-section view for an asymmetric weight block. In other words, a symmetric weight block is axi-symmetric with respect to angle θ. For any angle θ the resulting cross-section view of the symmetric weight block would be the same. Let the plane x-z represent the imaginary cutting plane. Note that point G represents the center of mass of the bowling ball. To illustrate, consider the figures below with a coordinate system xyz as shown. This topmost position is closest to the outside surface of the bowling ball.Ī symmetric weight block is called "symmetric" because it is axi-symmetric, meaning it has an axis of symmetry along its centerline. The "pin" represents the topmost position of the weight block, as shown. The weight block is molded into the bowling ball. The figure below shows the cross-section view for a symmetric weight block.
#Pull the pin challenge 26 full
To illustrate them, imagine cutting a bowling ball in half with an imaginary cutting plane (as shown below) so as to expose the full cross-section of the weight block inside the bowling ball. There are two basic types of weight blocks used, symmetric weight blocks and asymmetric weight blocks. These play an important role in the physics of bowling and (consequently) a bowler's performance, as will be discussed. The mass and shape of the weight block affects the spin of the bowling ball and how it curves as it rolls down the lane. The bowling ball consists of a hard outer shell with a weight block in the core (the inside of the bowling ball). The figure below shows two ten-pin balls. The physics of bowling discussed here will be with regards to ten-pin bowling, which is one of the most common sports in the game of bowling. For ten-pin bowling, regulating bodies allow for a maximum weight of 16 lb (7.2 kg), and a maximum diameter of 8.6 inches (21.8 cm) (ref: ). Ten-pin bowling balls generally have three holes drilled into them two finger holes and one thumb hole for gripping. A bowling ball is made from urethane, plastic, reactive resin or a combination of these materials.
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