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# Determining gravity from a simple pendulum

Extracts from this document...

Introduction

Determining the value of gravity due to acceleration from simple pendulum motion

Raw data:

 Length of string (cm)(+/- 0.01) Time for 20 oscillations (s) Average time (s)

Middle

14.39

14.40

14.47

14.42

 Average time(s) (+/- 0.1) Time period (s) (+/- 0.1) Acceleration due to gravity (ms-2) 40.95 2.05 9.40 +/- 1 ms-2 28.83 1.44 9.52 +/- 2 ms-2 20.50 1.03 9.30 +/- 4 ms-2 14.42 0.72 9.52 +/- 8 ms-2

Data processing:

Average time: (Trial 1 + Trial 2 + Trial 3)/3                    eg: (40.77+41.00+41.07)/3 = 40.95

Uncertainty of average: [(Highest value)-(lowest value)]/2          eg: [(41.07)-(40.77)]/2 = +/-0.15 s

Conclusion

Graphs:

*Graph number 2: The period of a simple pendulum is directly proportional to the square root of length of the pendulum, thus we get a more or less straight line.

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