# And apparatus on a table top where, if

And many a time the item that falls lands on someone’s foot. That is why I have planned to prepare my apparatus on a table top where, if the masses should fall, they will only drop a short height onto the surface of the table. Another safety issue that I feel safer to take into account is the elasticity and elastic potential energy in the spring. If the spring is holding some weight, and the weight should slip off the spring, the spring may ‘spring’ off the retort stand, and has some chance of getting into someone’s eyes.

This I shall not let happen, which is why I shall be wearing goggles, and have those who are working near/with me to wear them also. Another measure I shall take to counteract this risk is clamp the top-end hook of the spring to the retort stand, so that it doesn’t just suspend through the hook, but by the clamp also. PREDICTION I predict that at around 8 kilograms/newtons, the spring, the stress shall exceed the springs region of elasticity, and the spring will probably break at around 12 kilograms. I say this because I have a rough idea of how the spring shall be (its size, weight, etc. ).

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Naturally, I assume that the up to around 8 kilograms, the spring will obey Hooke’s Law (which is general theory anyway), and that the strain shall be proportional to the stress, and when I double the weight, the extension should double also. IMPLEMENTATION Load (N) Actual Length (mm) Extension (mm) Reading 1 Reading 2 Reading 3 Average The table on the previous page contains the results from my experiment that I carried out.

The whole experiment took approximately 30 minutes, which is in a sense quite quick, especially because I completely planned my experiment. Everything went well and no one was hurt, luckily. The measurements were recorded appropriately and fairly. Other than that, there isn’t much else to comment on. At the end, when the spring couldn’t suspend any more mass, I measured the spring again, when it was load free.

Its length had changed, its new length is 84 mm. ANALYSIS From the table of results above, I have managed to construct the following graphs……. In GRAPH 1, I only included values where Hooke’s Law was true, or where the spring hadn’t yet deformed. Here my results weren’t too inaccurate, as can be seen from my line of best fit. They all fell well within the X error bars. In the second I included all my results, and when the spring deformed is pretty obvious. This I can tell from my graph, where it shows a distinctive drop in the steepness of the slope near the end of the graph.

I have indicated where the spring deforms by the point where two dotted red lines meet up and that also shows under which weight or load the spring reached its elastic limit. I managed to do the line of best fit accurately using the computer, and my line of best fit was really close or on all the points of the graph. I know that the graph shows proportionality by the way that the line of best fit is straight and on all the X error bars. CONCLUSION Some of my predictions turned out right, the spring obeyed Hooke’s Law up to a certain point, and the strain was proportional to the stress up to that point also.

I can see this from the line of best fit which I included GRAPH 1. However my prediction of the spring reaching its elastic limit at around 8 N, was pretty much well off target. So I now know that the spring’s elastic limit is at around 13 N in load. After 16 kilos, the spring couldn’t really hold anymore, though it hadn’t broken or anything. If I were able to continue adding more and more load to the spring, I may have been able to get a more extended graph and I would’ve been able to see things such as the springs yield point and where the spring would break.

Unfortunately that was not possible here, and therefore I only worked out spring’s elastic limit, or the limit of proportionality. So I also know that the spring, or even the spring’s material, obeys Hooke’s Law. And of course, the spring was really and truly deformed, coming EVALUATION Personally, I think that I carried out this experiment successfully, and my method of carrying it out and my method of recording were appropriate, safe, accurate to a reasonable extent, and efficient too. I didn’t come across any weird data or anomalies, and my data presented clear-to-see evidence.

It also had a lot of integrity, considering how I recorded and obtained my data. However, there is an important mistake that had not come to my mind, and that is I hadn’t made any record of the material of the spring. I think if I had taken note of the material of the spring, I would have been able to make some comments upon the elasticity of that material. Personally, had it been beneficial to me, I would’ve carried out this entire experiment again, but this time with a spring of slightly longer length (maybe 7 cm) and better capability of holding onto load.

This would help me find out how the spring behaves after the load has exceeded its elastic limit. I think the data and the evidence is reliable enough to support my conclusion, and luckily there was no inconsistence to worry about or account for. This document was downloaded from Coursework.

Info – The UK’s Coursework Database – http://www. coursework. info/ This document was downloaded from Coursework. Info – The UK’s Coursework Database – http://www. coursework. info/ Emad Rahman – 11NGO – Sapphire House – Science – Mr DeJonge.

GCSE Coursework – Hooke’s Law – 08/05/2007 This document was downloaded from Coursework. Info – The UK’s Coursework Database – http://www. coursework. info/ Page 1 of 12This document was downloaded from Coursework. Info – The UK’s Coursework Database – http://www. coursework. info/ This document was downloaded from Coursework. Info – The UK’s Coursework Database – http://www. coursework. info/ This document was downloaded from Coursework. Info – The UK’s Coursework Database – http://www. coursework. info/.