# Investigating a Simple Pendulum.

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Introduction

Physics Coursework

Investigating a Simple Pendulum

Daniel Victory 11BY

Evaluating Evidence

In a way, I think that my experiment was successful. Most people would say that it would not have been a successful experiment if their results did not exactly match some of their predictions, just like my results, but I think that my experiment was a successful one because it made me realise that results will not always match predictions and it is fine to get results different from those you expected because it gives you more things to investigate when doing your evaluation.

I think that my experiment was quite a fair one seeing as each test was done three times and an average result was taken. When I was testing the variables, length, mass and amplitude, I only tested one at a time, keeping the other two variables the same. I performed the experiment in the centre of the work bench, so the pendulum could not hit anyone passing by or and walls or other objects.

As I said earlier in my

Middle

If we look at the table of results for the formula, we can see that as the length increases, the difference between the actual time taken for one swing of the pendulum and the formula result gets closer. This could mean that the formula is meant for slightly larger lengths than 10 and 15 centimetres, maybe something such as one metre and above. Or it could mean that my results are inaccurate, especially those with shorter lengths, seeing as they swing faster and are obviously harder to get accurate results for.

And now I will be attempting to explain why I think that the formula: , did not give a constant result.

The reasons are the same as the ones for the above formula, that my results may have been slightly inaccurate and that the apparatus I used may also have been inaccurate.

And again, if we look at my table of results, the results of the formula seem to get closer to a constant as the length increases. This could mean that the formula

Conclusion

If I had more time I probably would have done each test five times instead of three to be more sure of reliable and accurate results. I would have also tested a wider range of lengths and then I would have been able to see if my predictions were totally correct or whether they were slightly wrong. From testing more lengths I would also have been able to find out whether the formula: , worked and also whether the formula: , gave a constant result.

And just as a final thought, even though I know it would not be possible, I would like to investigate the effect that gravity would have on the time for one swing of the pendulum. I think that gravity would have an effect on the time taken for one swing of the pendulum seeing as it features in the same equation that helped me to predict that only length would effect the time taken for one swing of a simple pendulum.

This student written piece of work is one of many that can be found in our GCSE Forces and Motion section.

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