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# To investigate the relationship between the extension and the force added, whether they are linked through proportionality.

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Introduction

Aim: To investigate the relationship between the extension and the force added, whether they are linked through proportionality. Hypothesis: I predict that there will be a relationship between the force and the extension. I believe that as the force added increases so will the extension. There should also be a pattern, which will help describe the relationship between the force and the extension. I am led to believe this from the scientific theory of Hooke's Law, which states that: "The extension is directly proportional to the stretching force" This means that if the force is doubled the extension will be doubled or if trebled it will be also trebled and it follows this same pattern. Fair Test: For this experiment I will be using elastic bands rather than springs. I will have to make sure that it is a fair test to have the most accurate results possible. Factors, which I have to take into consideration, are things like the length and thickness of the rubber bands. ...read more.

Middle

300 60 150 mm 90 mm +15 350 60 165 mm 105 mm +15 400 60 180 mm 120 mm +14 450 60 194 mm 134 mm +16 500 60 210 mm 150 mm Load (N) Original Length (mm) New Length (mm) Extension (mm) +/- 00 60 60 mm 0 mm +15 50 60 75 mm 15 mm +15 100 60 90 mm 30 mm +15 150 60 105 mm 45 mm +14 200 60 119 mm 59 mm +16 250 60 135 mm 79 mm +15 300 60 150 mm 90 mm +15 350 60 165 mm 105 mm +15 400 60 180 mm 120 mm +15 450 60 195 mm 135 mm +15 500 60 210 mm 150 mm Load (N) Original Length (mm) New Length (mm) Extension (mm) +/- 00 60 60 mm 0 mm +15 50 60 75 mm 15mm +16 100 60 91 mm 31 mm +14 150 60 105 mm 45 mm +15 200 60 120 mm 60 mm +15 250 60 135 mm 75 mm +15 300 ...read more.

Conclusion

This enabled me to obtain an almost perfect set of results. I recorded three sets of results to make it perfect and then I found the average. A line graph was plotted for all of the results obtained. I did have mistakes in my results which may been due to me not measuring the length of the elastic band correctly. If I were to carry this experiment again I may do a few things differently. I would have put a pointer on the hook to get the measurements even more accurate than I did. I would also hold the metre rule with the clamp rather than with my hand so it will be steadier and give more accurate results again. Also I could have used a 12ft ruler rather than a metre rule, so that I would have had the results to the nearest decimal. Overall I felt I did a good job in this investigation and I proved my prediction right and got next to perfect results. Ahmad Mattar 11B Science Coursework (Hooke's Law) 01/05/07 1 ...read more.

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