Data Collection and Processing
Results from the experiment
Conclusion and Evaluation
Conclusion
According to my results the height and the time aren’t directly proportional. However I think they should be proportional. I think my results are not proportional because there are systematic errors in the experiment .c
I think that the values of the systematic errors are too high. The reason for this is the standard value for reaction time (0.2s). The values of the results were really small. Therefore the 0.2 was a really big percentage of it. Because of this the uncertainties were really high. If I didn’t use the 0.2 and just used the range from my results, the uncertainties would be much lower. They would have been:
However some like 1m, 4m and 5m wouldn’t make any sense as 9.8 (gravity) isn’t in its range.
I think there were some random errors. One of them was when to start the stopwatch. There were some times as you can see in the results table when the stopwatch was started too early or too late. Another one was the height. When measuring the height, sometimes the measuring tape would be slanted
The value of gravity is 9.8 (I got this results from wikipedia (http://en.wikipedia.org/wiki/Gravity). In my results, I don’t have any results that exactly matches the answer. However there are 4 results (10.1, 10.6, 10.8 and 11.1) that gets really close. The ranges for all my results had 9.8 in it.
Evaluation
I think the quality of my results were ok. All of them were within ±5 of the value of gravity. I think quality of the results would have been better if I were in a place where there was no air resistance. The line of best fit went through all the uncertainty bars. However I thought some of the uncertainty bars were really big. However this again was because of standard value of reaction time (0.2).
I think some of my results were quite accurate and a few were quite precise. However there were a lot of data that wasn’t precise at all. Out of the 9 heights, only 3 were precise in which only two were accurate too(8m and 9m).
To make my experiment more precise and accurate more hi-tech equipment is needed such as using lasers to help me time accurately. To make it more accurate I would also try to make to eperiment with bigger heights. This will make the results more accurate because there will be more reaction time. I think To make more precise I would need to coduct this equipment in a place where there is no air resistance. However this is not possiable in a school as the technology needed to this is too expensive. Another way of improving the precision is to get rid of the anomalous result and redo the equipment.
