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We set the apparatus as shown above. First of all we took the measurement on the metre rule in cm, of the elastic band at the pointer without any weights attached.
Then we steadily increased the force by adding a 0.5N weight each time to the elastic band. We did this until we reached 3N, and then steadily decreased the force by carefully taking of a 0.5N weight each time, until we had no weights attached to the elastic band. Next we again took the measurement on the metre rule in cm, of the elastic band at the pointer without any weights attached. We recorded the results of the length in cm at the pointer, each time a weight was added or removed and at the beginning and end when no force was being applied to the elastic band.
We repeated the experiment 3 times to make sure our results were valid. We made sure the experiment was fair by keeping the following variables the same;
Units on metre rule to record results (cm)
Person taking measurement
Amount of load added each time
Person adding and removing weights
Lastly, we worked out an average length in cm by adding the 3 results and dividing by 3.
We then took 1 average from an other to work out the extension. As seen in the results table over the page.
My graph shows the relationship between the weight on an elastic band and its extension. The graph is not a straight line showing that’s its extension is not proportional to its load, disobeying Hooke’s law.
My graph shows that the elastic band has been stretched because the unloading of weights has a greater extension than the loading of weights, and does not return to its original shape.
My graph has shown that an elastic band does not react in the same way as a steel spring because when stretched both react differently. A steel spring keeps its original shape and its extension is proportional to its load obeying Hooke’s law. However, a elastic band stretches and does not keep its original shape, also its extension is not proportional to its load.
There are a few factors I could of changed to improve my experiment to obtain more accurate and clearer results.
First of all I could have repeated my experiment more times to get a more accurate average length to improve my graph. If I were to repeat my experiment I would do it 5 times instead of 3 to get a more accurate length.
Also, smaller weights would of given me a more accurate graph and results, from having smaller weights I would have a clearer idea of how differently a elastic band behaves to a steel spring. If I were to repeat my experiment again I would add only a 0.1N weight each time.
Lastly, I only went up to a maximum of 3N then back down, but with more time available I would of gone up to 6N to test the elastic bands elasticity, strength and to obtain more accurate results to find out exactly how a elastic band behaves.
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