# Biomechanics Lab Report Essay

3434 Words May 27th, 2013 14 Pages
Biomechanics Lab Report By Connor Blakely
Question 1) All figures given in metres. All players using lofted clubs (9 irons). Cody | Trial 1 | Trial 2 | Trial 3 | Average | Air Ball | 18.8 | 21.8 | 21.2 | 20.6 | Practice Ball | 39.2 | 37.9 | 62.8 | 46.63 | Golf Ball | 115.75 | 77.2 | 82.65 | 91.87 |

Graph to Show Cody’s Results with the Different Balls

Bailey | Trial 1 | Trial 2 | Trial 3 | Average | Air Ball | 18.3 | 25.5 | 23.65 | 22.48 | Practice Ball | 38.2 | 41.8 | 55 | 45 | Golf Ball | 90.2 | 89.2 | 95.1 | 91.5 |

Graph to Show Bailey’s Results with the Different Balls

James | Trial 1 | Trial 2 | Trial 3 | Average | Air Ball | 21.47 | 21.27 | 20.92 | 21.22 | Practice Ball | 76.08 | 82.7 |
Air resistance and drag had a major influence in the results obtained in question 1. In fluid dynamics, drag (sometimes called air resistance or fluid resistance) refers to forces which act on a solid object in the direction of the relative fluid flow velocity (Wikipedia). Drag on the air ball would have affected it the most out of all balls, due to its hollow structure and big air holes around the ball. Drag forces always decrease fluid velocity relative to the solid object in the fluid's path. As the fluid was continuously going through and acting against the air ball, this caused the ball to decrease in velocity only after a few seconds of being hit. The drag forces placed upon the practice ball were significantly reduced due to the practice ball containing no air holes. The structure of the practice ball was still hollow inside, which caused the ball to still be affected by drag. Lastly the golf ball obtained the least amount of drag due to the solid structure of the ball. Overall drag was a key factor in influencing the distances covered by each respective ball.
The coefficient of restitution is a value representing the ratio of the velocity after an impact compared with the velocity before the impact. Basically the COR measures the bounciness of an object. A perfect elastic collision is when no

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