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Investigating if the speed of an object changes when the size or shape is changed.

Extracts from this document...

Introduction

Investigating Speed Aim I am investigating if the speed of an object changes when the size or shape is changed. I will investigate this through 2 experiments. Apparatus list Stopwatch 20 pieces of tracing paper Scales Preliminary work Before my main experiment, I decided to do some practices to determine how high to drop the paper from. I started at 1m and noticed immediately that the time it took to reach the ground was too quick for us to take a reading in. I decided to increase the height by 1m. When I dropped the paper from 2m, I was able to take an accurate reading and decided to increase the height again by 1m. I then encountered a problem being that it was too dangerous to drop the paper from this height, so I chose to drop the paper from a height of 2m. Plan Experiment 1: An A4 piece of paper will be dropped from a height of 2m, 3 times. When the paper is released, a stopwatch will be used to time how long it takes to reach the floor, and this will be recorded in a table. The average of the three results will be found and the speed will be calculated. ...read more.

Middle

I could extend this investigation by raising the height of where I release the paper from and see what effect this would have on the speed of an object. Apparatus List 1000ml plastic tube 50 cm of thread 2g of plasticine Scales Stopwatch Preliminary work Before my main experiment, I decided to do some practices to determine how much plasticine to use and also how much water to use. I started by half filling the plastic tube with water and using 5g of plasticine. I found that the time it took for the plasticine to reach the bottom was far too quick for me too take a reading in. So, I increased the amount of water, by filling the tube to the top. I then dropped the plasticine again. I still found that the reading was too quick so I decreased the amount of plasticine I used. I now used 2g of plasticine and found that the reading I took was much easier and more accurate because I was not delaying. I had another problem which was that every time I dropped the plasticine in the water, I found it hard to get it out, so I attached a piece of string to it and solved this problem. ...read more.

Conclusion

This is because, as I said in my prediction, when the plasticine is a torpedo shape, the water resistance will be smaller than if the plasticine was a cube shape. Therefore, if the water resistance is less, the time taken for the plasticine to reach the bottom will also be less. Also when the plasticine is a torpedo shape there is less Upthrust acting upon it if the plasticine was a cube shape. This will also result in a quicker time for the torpedo. Evaluation Although in my experiment, I have no anomalous results, the results I recorded are not as accurate as possible. This is partly due to the stopwatch. It could have been more accurate because we recorded to 2 decimal places, but if we recorded to 3 decimal places, our results would have been more accurate. If I did the experiment again, I would make it better by using more accurate equipment such as a computer controlled stopwatch that would give precise results every time. I could extend this investigation by raising the height from which I dropped the plasticine from and also by using a different liquid instead of water such as a soft drink. ...read more.

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