Calculated
now, we should use the slope formula to find the slope, and then we should compare slope = but without g, andthen calculate g
Conclusion:
Even when we take into consideration the uncertainty for the period, having an uncertainty for gravity being over 4 ms^-2 is certainly not correct. Despite having paid utmost attention to the experiment's accuracy by, for example, using 10 loops instead of 1 to find the period, or having 3 trials, and averaging the results, gravity was still not close enough to approximate that the formula for centripetal force is proven using this experiment. However, there are some changes that could have changed the outcome.
Firstly, there are some errors which could be fixed. While spinning the rubber bung, I was counting the times it flew past my eyes, this may have caused subjectiveness, or could have just trusted my judgement too much. This could have been fixed by adding another person to count the rotations.
This same problem was caused while timing the results. While the times for the seperate trials were deceptively constant, the actual result as not as precise as it should have been, but rather, very far off. This could be remedied not only by having 3 trials for each mass(which we did), but having another timer as well. It could have made our results more correct, which could have been flawed by the same person making the same mistake.
Finally, I feel that this experiment was made on too small of a scale to be accurate. While uncertainties of the experiment will be larger on a larger scale, they will be smaller in proportion than the uncertainties of the small experiments. I think this could be remedied by having a 250 gram rubber bung (or similar object), and a length «l» of at least 50 cm... perhaps even 1 meter. Also, the bottom mass, «M» should be larger: from 500 grams to a kilogram. While we would only have 1 group rather than 2, doing this would probably help be more precise because experiments done a larger scale are more precise (one of their characteristics.
