# Ap Physics Lab Report- Pendulum Essay

736 Words Mar 9th, 2013 3 Pages
Is gravity always 9.8m/s2??
INTRODUCTION: A simple pendulum consists of a mass m swinging back and forth along a circular arc at the end of a string of negligible mass. A pendulum is a weight suspended from a pivot so that it can swing freely. Gravity is the pull that two bodies of mass exert on one another. There are several simple experiments that will allow you to calculate the acceleration due to gravity of a falling object. A simple pendulum can determine this acceleration. The only variables in this experiment are the length of the pendulum (L) and the period of one full swing of the pendulum (T). In this case the independent variable represents the length of the string and the dependent variable represents the period of one
DATA & GRAPH: Trials | Length (m) | Period Avg. (s) | (T/2∏)2 | 1 | 0.85 | 1.71 | 0.074143474 | 2 | 0.75 | 1.61 | 0.065725283 | 3 | 0.68 | 1.53 | 0.059355856 | 4 | 0.65 | 1.43 | 0.051850481 | 5 | 0.54 | 1.3 | 0.042851637 | 6 | 0.46 | 1.17 | 0.034709826 | 7 | 0.34 | 0.94 | 0.02240456 | 8 | 0.25 | 0.83 | 0.017467747 | 9 | 0.185 | 0.46 | 0.005365329 | 10 | 0.085 | 0.21 | 0.0011182 |

ANALYSIS: By looking at the graph we can tell that our data was pretty accurate based on the data we recorded. In this lab R2 = .9435 which that shows us that it was close to 9.81 m/s2 which is what we expected based on our hypothesis. Maybe we would have gotten a better data if the stopwatch was a electronic one because there might have been some errors while counting the oscillations and paying attention to the stopwatch at the same time. This irregular movement of the stand affected the motion of the pendulum as it did not have the same amplitude throughout hence affecting the time period. Another error was that when the length of the string was decreased, the string was not cut and then fitted but was rounded to the top.
Percent Error: |theoretical value-calculated valuetheoretical value|×100
Percent Error: |9.81 m/s2- 9.435 m/s29.81 m/s2| ×100 = 3.82%
CONCLUSION: Overall, the experiment was carried out with minimum errors and was followed according to the given procedure. Based on the hypothesis, we came up with the conclusion that gravity is always

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