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Investigation to find out which variables change the period of a Pendulum!

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Title        Page

Aim        1

Background Research        1

Hypothesis        2

Risk Assement        2

Apparatus        2

Plan        2

Variables        3

Fair Testing        3

Results        3

Graph        4

Analysis        5

Evaluation        6

Bibliography        7

Investigation to find out which variables change the period of a Pendulum!


Investigate to find out what variables would effect the period of a pendulum.  The period of a pendulum is – the time it takes for a pendulum to swing from one side and back to its original place.

Background Research

Pendulum – A regularly swinging object with a regular transfer to and from between kinetic and potential energy.  The periodT depends only on the length l and the acceleration of free fall g.

A simple pendulum has, in effect, all its mass in a small bob.  People use it to find g; equation is:

g = 4π2l


This explanation was taken from : Basic Facts Physics, by Eric Deeson (Collins GEM.)  pg 147

Period(T) – The time for one full cycle of a repeated (cyclic, periodic or harmonic) motion: such as the earth’s orbit round

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The pendulum which travelled through the larger angle had a longer period. It averaged 29.42 oscillations during 30 swings of the other, and had fewer oscillations in every trial. Clearly, pendulums with different amplitudes do not have the same period. In fact, it appears that pendulums with larger amplitudes have longer periods. The difference is quite small, though. Whether Galileo's claim is true depends on interpretation of the claim, but the interpretation that identical pendulums of different amplitudes have periods independent of amplitude is false.


I think that when the angle is increased the time of the period will still stay around about the same time.  I think this because as the pendulum drops it will get faster, and then will slow down when going back up.  So therefore because there is a section when the pendulum is travelling fast and when it is travelling slow it roughly will even out.

Risk Assement

Masses hitting people – I will have to keep my equipment in a corner which will not affect people walking pass.

Masses dropping on someone

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The results that I have collected not exact, when measuring the number of swings and the time it took the time was not exact.  I think that if I had calculated my average period not to twenty seconds but to the exact time then I would of got some different results.  During my practical there was no such difficulty that I encountered which have cause anomalies or any uncertainties.  


Book Title/Web address        Author and Page

Basic Facts Physics        Eric Deeson pg 147 (Collins GEM)


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