Determining Damping Constant k From Data

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SUMMARY

The discussion focuses on determining the damping constant k from experimental data of a damped pendulum bob. The equation used is A = A_0e^(-kn), where A_0 is the initial amplitude set to 1. The user successfully plotted a graph of amplitude versus turns, revealing an exponential decay. To extract the damping constant k from the graph, the user is advised to plot ln(A_0/A) against n, which will yield a linear relationship, allowing for the calculation of k from the slope.

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Talz1994
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Homework Statement


i had an investigation
use your data to find the value of k, compare this theoretical number with your data.
- plot a suitable graph so that you can determine k.

Homework Equations


A= A_0e^(-kn)
A_0 initial amplitude = 1

The Attempt at a Solution


hey I am new to the forum and yeh here my question. well i was given the homework getting a set of readings of a damped pendulum bob. i got the readings took an average and then i managed to plot a graph of those readings. i did so and i managed to get a graph which decreases exponentially. now i want to compare my therotical damping constant with my data and i have come stuck.
the y-axis is amplitude, "A" and the x-axis "n" turns

my k value theoretically is 0.22456, but i don't know how to find it from my graph.
should i change my y-axis to ln(A_0/A) that's how one of my friend did it but i don't get it.

sorry for poor english, its my second language, first time using forum. and i tried to follow the rules... :/
 
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