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Bouncing balls

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Planning (P) For my physics coursework, I have been asked to investigate the factors, which affect the way in which a ball will bounce. I looked into a few different factors, including height of the ball, landing surface of the ball, and in depth, the height from which the ball is bounced. I also looked at how the temperature change takes place while bouncing the ball. I took my final point further and decided to investigate the temperature of the ball while bouncing. My input variable is going to be the temperature, which I will be changing. Prediction: After doing some background research on different types of balls, I found out a reason why balls actually bounce. All balls bounce because of the air and gravity. The air makes the ball bounce. If I bounce a ball in the air, it will not stay up and bounce back down. The reason for this is gravity. If I bounce the ball hard, it will go up high in the air but if I bounce the ball softly, it will not really bounce at all. The reason for this is because balls have elastic in them. ("The elasticity is an objects property of changing shape when the deforming force is moved"). ...read more.


the temperature will go up in 20's instead of 10's because the temperatures that I have chosen did not give me an accurate result in my preliminary investigation. Results (O) In my team, we made sure that we did our experiment safely. To make our investigation fair, we decided to do our investigation more than once; we actually did it three times. Below is a table of my results: Number of times the ball bounces Temperature (�C) Experiment 1 Experiment 2 Experiment 3 Room Temperature - 25�C 5 5 6 45�C 5 6 5 65�C 5 5 5 85�C 6 6 6 As you can see from my table, my results did not show enough evidence but I did realise at the temperature 85�C, that if I did another test on 105�C, then I would be able to see that the number of times the ball bounces will increase. I can see form my table that doing my experiment three times gave me an accurate result. There are a few ups and downs in my table but only by one unit. This made my results more predictable. Below I have draw four graphs. Three of the graphs are for each experiment and one is for all three experiments in one. ...read more.


This will give me an accurate result because the higher the temperature the more number of bounces you will get. * The next thing I will want to change is the ball. After doing the experiment I realised that a tennis ball was not a great ball to do the experiment with. Tennis balls do not bounce as much. So I will use a different type of ball which actually bounces a lot. I would also want to remove the fur of the tennis ball, because I think that the fur is the only thing that prevents the tennis ball from being heated up from the inside. * After looking at the ball, I also realised that the tennis ball did not get the hot temperature right through it because of the fur. This could be another reason why my results were not accurate. * If I want, I can also change the height the ball is dropped from, because if I drop the ball from the height of 1-meter, then the ball will bounce more than the ball dropped from a 2-meter height. This is not a good idea, but can change my results and help me prove my point. These are the main things I would want to change. I'm sure that if I have applied all these to another experiment, I will get an accurate result. Nitu Kapoor Science Bouncing Balls ...read more.

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