To verify the relation of Simple Pendulum

Published: 2022-12-30
To verify the relation of Simple Pendulum
Type of paper:  Report
Categories:  Leadership analysis Finance Society World Disorder
Pages: 3
Wordcount: 639 words
6 min read

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To verify the relation of simple pendulum.

Where T = Periodic time in sec.

L= Length of pendulum in cm.


For conducting the experiment, a ball is supported by nylon thread in to the chuck. It is possible to change the length of pendulum. This makes it possible to study the effect of variation of length on periodic time. A small ball may be substituted for larger ball to illustrate that the period of oscillation is independent of the mass of ball.


Attach the ball to one end of the thread

Allow the ball to oscillate and determine the periodic time T by noting the time for say 20 oscillations.

Repeat the experiment by changing the length

Complete the observation table given below


Acceleration due to gravity, g = 9.81 m/s2

Radius of the ball = 2.5 cm


Time Period, T Actual =t / nSec.


448881563500Time Period, T Theo. =Sec.


T =Time taken by 'n ' oscillations.


L =Length of pendulum from the center of the ball in cm


# Pendulum Length Oscillations Number Oscillations Time Actual Period Theoretical period Error

1 0.66 20 32.72 1.636 1.630 0.34%

2 0.575 20 30.04 1.502 1.522 1.30%

3 0.475 20 28.76 1.438 1.383 3.97%

4 0.38 20 24.49 1.2245 1.237 1.02%

5 0.27 20 20.78 1.039 1.043 0.36%

Calculation sample:

tActual=Ocillations TimeOscillation number= 32.7220=1.636 sectTheoretical=2pLg=2p0.669.81=1.630

Graph: T Theoretical Vs T Actual


Results of counted number of oscillations (20 oscillations) made by the swinging mass were recorded. Also, the time taken during the oscillations was as well recorded.

Final calculations were carried out and the calculated periodic time (T) was found to be approximately 1.363s while the theoretical/ideal periodic time is 1.630s.


Following the results obtained there were discrepancies between theoretical and calculated periodic time (T). This might have been caused by various physical factors; human errors (accuracy), this might have been the parallax measurement of the parameters. There might be some errors encountered due to erroneous instruments. For instance, a stopwatch might be the cause of errors instead this errors would be minimized by using the photo sensors which are more precised.

Measurement of amplitude (the length of the string) in a precised and more accurately would also minimize such errors. If a photo timer would be used to measure the periods the sources of these errors would be minimized. Precise devices for this measurements which were to be taken from the laboratory. Besides, there might be systematic errors encountered with during the experiment. The errors might include air resistance of the mass and string producing the oscillations.

Concerning the variable periodic time of which we theoretically know that this measured periodic time should be the same all through since the number of oscillations were 20.


In conclusion, we agreed that time was the mostly affected parameter by the variation of string's length. In accordance with the data obtained an analysis of the trend claimed that as the length of the string decreased the periodic time also decreased. The amplitude did not affect time. It was also deduced that the surroundings were not perfect for the experiment thus some friction was experienced by the ball producing the air resistance. The theoretical value is nearly the same to the calculated value thus such minor discrepancies are due to nature, friction and the resistance the air particles to the swinging ball.


Nelson, R. A., & Olsson, M. G. (1986). The pendulum-Rich physics from a simple system. American Journal of Physics, 54(2), 112-121.

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