A major premier league club is calling for a review of the allowable pressure range for the game balls after losing a penalty shootout. The club claims that their chances of winning were adversely affected as the ball kicked by their main striker was reportedly “softer” than the other balls used during the shootout and that this reduced the speed of the ball as it left the striker’s foot. The balls were all within the allowable pressure range (0.6-1.1 atm); however, the club believes that the range is too wide
You have been asked to investigate the appropriateness of the current pressure range with consideration of the differences in the performance of the ball as a function of pressure. In order to fulfil the requirements of your task you must:
1.Search the available literature to determine a coefficient which can be used to determine separation velocity if the velocity of the impact (strikers foot speed when hitting the stationary ball) is known
2.Design an experiment to extract this coefficient from the ball over a pressure range of 0.5-1.2 atm.
3.Tabulate your results with a quantified measure of the uncertainty in your results
4.Based on your results discuss the appropriateness of the current pressure range.
The engineers have also asked you to explain any notable phenomena in your results and any possibly limitations to you technique.
3.0 ALLOWABLE EXPERIMENTAL EQUIPMENT
For this study you are only allowed to use the following experimental equipment:
- A sound recording device (no video)
- PC with audio analysis software (eg. Matlab, audacity, etc.) Hint: In designing your experiment you should consider the use of projectile motion relationships which include time and velocity.