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Size 6 Ball Research

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Sports in our world today is a significant aspect of many cultures and national identities. Successful sportsmen/women are treated like heroes, and the fans can go to incredible lengths to support their team. With the huge importance placed on sport in our modern world, it therefore is important for every athlete to have to deal with the same conditions and equipment to ensure fair play. The large majority of all sports in the world are ball sports, whether it is being thrown, kicked, hit or bounced. With the large variety of ball shapes and sizes, it is natural for people to compare and experiment to see which produces the most movement in any particular direction. One example of this is bounce. Though there are many different types of balls, …show more content…
The size 6 ball bounced back to 74.9% of its original height, the heavier size 7 ball bounced back to 73.4% of its original drop height, and the other size 7 ball bounced back to 70.6% of its original height. This fits well with rule 1-12-2 which states, “The ball shall be inflated to an air pressure such that when it is dropped to the playing surface from a height of 6 feet (1.82m), measured to the bottom of the ball, it shall rebound to a height, measured to the top of the ball, of not less than 49" (1.24m) when it strikes on its least resilient spot, nor more than 54" (1.37m) when it strikes on its most resilient spot.” (A.Maker 28/1/2006). When put in terms of percent height, this gives a range of 68% to 75%. All results were within that margin, indicating that the data is fairly …show more content…
The theoretical velocity of the free falling balls were calculated, taking into consideration each slightly different drop height (see sample calculation 3). These calculation do not take into consideration the air resistance encountered by the basketballs, thus it would be expected that the size 6 ball, with a smaller surface area, would encounter less air resistance and get closer to its theoretical velocity. However, the size 6 ball reached only 34.2% of its theoretical velocity, whereas the 593g size 7 ball reached 38.6% of its theoretical velocity, and the 589g size 7 ball reached 39.9% of its theoretical velocity. This is quite surprising, considering Galileo's observation that, “All free falling objects fall with the same acceleration.” One potential reason for this could be the different surface of each basketball. Different brands of basketballs have different surfaces; some have ridges and bumps to provide extra grip for the person holding the ball, while some are simply flat. These ridges were present on both the size 7 balls, but not the size 6 ball. This could have possibly changed the aerodynamics of the basketball, thus resulting in the higher velocity. It is surprising, considering that one of the reasons given for the size 6 ball to bounce higher was its lower air resistance, and thus higher velocity at the point of impact with the ground.

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