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# Pendulum experiment

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Introduction

Pendulum experiment Aim: To see the effect length has on a pendulum's period. Prediction: I predict that the shorter the length of string, the shorter the time it takes for the pendulum to complete one period. The longer the length of the string, the longer the time it will take to complete one period. Equipment needed for experiment: -Clamp -Stopwatch -Bob/Ball -Metre ruler -String Obtaining the results: I will be measuring the length of the string in 10s, so that I can obtain a wider range of results. I will then take 10 readings, and calculate the average time of osocilation for each length, making it a fair test. ...read more.

Middle

Time (secs) Average Length (cm) Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 10 0.91 0.87 0.92 0.98 0.92 0.92 20 1.06 1.13 1.1 1.04 1.02 1.07 30 1.3 1.41 1.33 1.33 1.35 1.34 40 1.72 1.32 1.4 1.34 1.38 1.4 50 1.84 1.33 1.7 1.69 1.81 1.67 60 1.7 1.69 1.77 2.03 1.7 2.04 70 1.93 2.13 1.98 1.86 2.28 1.88 80 2.23 2.05 2.02 1.95 1.94 2.04 90 2.29 2.13 2.34 2.25 2.2 2.24 100 2.02 2.34 2.55 2.53 2.41 2.37 Conclusion: From the results I have gathered I can see that the longer the length of the string, the longer it takes for the pendulum to complete one period. ...read more.

Conclusion

If the period for a pendulum of 40cms was 1.4, then the time of the period for the pendulum of 10cms should be 0.7. I tested this theory with my results and found that it was correct, though not entirely accurate, It was roughly the same. The reasons for the average time not being entirely accurate could be a problem with the stopwatch, and also anything measured in this way is not going to be 100% accurate. The results that don't fit the pattern of the rest of the graph are called anomalies. An example of an anomaly on my graph could be for length 60cms. The time suddenly jumps up, but then back down again. This could be a problem with calculating the average or maybe one of the trials was extremely off-target. ...read more.

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## Here's what a teacher thought of this essay

This is a 3 star piece of work. The procedure followed would give valid evidence for the question asked. There is little scientific information within the writing. The prediction should not merely say what you think will happen, but to score more highly, why? The conclusion should also be backed up by scientific information.

Marked by teacher Kate Gardiner 13/03/2013

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