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Squash Ball Investigation

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Nick Graham 11WS Squash Ball Investigation Introduction In this investigation I will be looking at the bounce height of a squash ball, and the factors that may change it. I will see if the bounce height is proportional to the change in the factor I choose to investigate. Factors There are seven factors I could investigate which are: * Temperature of the ball (C) * Surface the ball is bounced on (NC) * Weight of the ball (C) * Type of ball (NC) * Height of drop (C) * Force of throw (C) * Gravity the ball is dropped in (C?) I want to look at factors that have continuous variables, because I need more than one result to find out if the factor is proportional to the height of bounce. I have marked the above factors with either C or NC in brackets, C meaning it has continuous variables, and NC meaning it doesn't and these are then ruled out. If I investigated the surface the ball is dropped on there would be little variance because there aren't many different surfaced to use, this is the same with type of ball as there are only three different types of ball. I have marked the gravity factor with a question mark because we don't have the apparatus to change the gravity the ball is dropped in, and we can't go to other planets to drop it. ...read more.


3. When the ball is released the reader must follow the ball with his/her eyes and when it hits the ground and begins to bounce up they must follow the tape measure height and once the ball stops and reaches it's maximum height they should write down the reading. 4. This should be repeated at least five times for each height. 5. Then go onto the next height. 6. Remember to wait for a minute after every drop so the ball can return to room temperature as it heats. 7. Don't hold it in your hands for long as this too will heat it up. Results Below is a table of the results we obtained: Height of Drop (cm) Height of Bounce (cm) First Set Second Set Third Set Fourth Set Average 50 12 13 8 13 11.5 150 35 30 32 36 33.25 250 40 38 41 44 40.75 350 61 65 66 68 65 450 80 67 72 70 72.25 550 76 89 91 81 84.25 650 105 62 110 117 98.5 750 114 120 121 111 116.5 We wanted to do an extra set of results, but we ran out of time when carrying out the experiment. I think this was because we wasted too much time waiting for the ball to cool down after each drop. ...read more.


If the balls were different types this will have made half of our results to be wrong, but we don't think this happened as we tried to time each drop so they didn't interfere. In the results there is one anomalous result which I have circled in the results table. It is an anomaly because it is 62cm and the three others are around 110cm, this will have brought the average down quite a lot and this will have made out best line of fit in a slightly wrong position. I believe it to have been caused by human error, which is inevitable in this experiment as it is very hard to read the bounce height without scientific apparatus. It is most likely to have been caused by the reader not writing down the right number, or them not reading the tape measure properly. Overall I think that my results are accurate as most are tightly grouped around the line of best fit, and we only got one anomalous result. When we compared our results with other groups they were roughly the same, so they can't have been very wrong even though they used a different ball. Secondary Sources During this investigation I had to use secondary sources to find information on specific subjects like elastic potential energy and about gravity, so I used these sources: * Encarta Encyclopedia 1996 * Hutchinson Encyclopedia 1996 * The Internet * Physics For You (Textbook) * Letts Revision Guide * * * * ...read more.

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