Straightforward Pendulum Laboratory Report

 Simple Pendulum Lab Statement Essay

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IBDP PHYSICS Interior Assessment

Student: Pascal BLAISE – Time: 10 January 2009

Manager: Mr. FOUCAULT – Intercontinental School of Pisa

" To what extent does the length of the string influence

the period of your simple pendulum? ”

IBDP PHYSICS Inner Assessment – The Simple Pendulum


The original shoot for this invesigation was to " investigate the easy pendulum”. There are plenty of variables one could look into, just like displacement, perspective, damping, mass of the greg etc . One of the most interesting variable, however , may be the length of the moving the pendulum. The partnership between the size and the coming back one swing (the period) has been investigated for many hundreds of years, and allows famous physicists like Isaac Newton and Galileo Galilei to obtain an exact value pertaining to the gravitational acceleration ‘g'. In this statement, we will certainly replicate their experiment, and we will try to find an exact value to get ‘g' here in Pisa. We all will then evaluate this value with the generally accepted worth of being unfaithful. 806 m/s2 [NIST, 2009]


In this research, we various the length of the pendulum (our independent variable) to observe a change in the period (our dependent variable). To be able to reduce feasible random problems in the time measurements, we repeated the measurement of the period 3 times for each in the ten measures. We likewise measured the time for five successive shiifts to further reduce the errors. The size of our original pendulum was set at 100 centimeter and for each one of the following measurements, we decreased the length by 10 cm.


A simple pendulum works simple harmonic motion, i actually. e. the periodic movement is described by a great acceleration that may be proportional to its shift and aimed towards the hub of action. It can be proven that the period T of the swinging pendulum is proportionate to the square root of the length l from the pendulum:

T = 4ПЂ 2



(Hyperphysics, 2009),


with T the period in seconds, m the length in metres and g the gravitational speeding in m/s2. Our raw


data should give us a square-root relationship between the period as well as the length. Furthermore, to find an accurate value intended for ‘g', we will also chart T2 compared to length of the pendulum. This way, we will be able to get yourself a straight-line chart, with a gradient equal to 4π2g–1.


For this investigation, there were access to limited resources; clamps, stands, a metre leader, a stopwatch, a metal ball (a. k. a. bob), and a few string. The experimental system was comparable to the picture, shown in figure you (Practical Physics, 2009).


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As stated before in the introduction, it was decided to measure the time for ten complete swings, in order to reduce the unique errors.


These measurements would be repeated two even more times, and in total 10 successive lengths were applied, starting from one particular metre, and decreasing simply by 10 centimeter for each subsequent measurement.


A metre ruler was used to determine the entire string. A single added difficulty in determining the length of the pendulum was the comparable big doubt in finding the actual length, since the metal frank

Tripod Stand

added just one centimeter to the string size, measured from your bob's middle. This triggered an concern in length that was greater than one would normally expect.


The stand clamp utilized to secure the positioning of the tripod stand, Metallic bob

while the pendulum was swinging.

Following your required measurements, one try things out was performed to find the

Figure 1: Picture of the

installation for this test

degree of diffusing in our installation. Damping always occurs the moment there is...

Referrals: National Commence of Standards and Technology. 2009. The NIST Reference on Constants, Units and

Uncertainty [Online] Available at: [Accessed 8 12 ,


Practical Physics. 2009. The Swinging Pendulum [Online] Up to date 22 Oct 2007. Available at [Accessed 8 December 2009]

Flightpedia. 2009. Pisa Airport PSA [Online]. Available at [Accessed 8 Dec 2009]