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To investigate whether the change of length of the string is proportional to the time of a swing of a simple pendulum.

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Physics Investigation


The aim of my experiment is to investigate whether the change of length of the string is proportional to the time of a swing of a simple pendulum.

A simple pendulum can be defined s an object which is suspended by a light, inextensible thread from a fixed point, allowing the pendulum to oscillate. The time required for one complete oscillation is known as the period of a pendulum (T). Time of a swing of a pendulum is affected by the length of the thread and the angle that the pendulum is released at.


I predict that the increase in the length will lead to increase in the time it takes the ball to swing.

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Prepare the materials needed.Setup a pendulum as shown in the diagram.Raise the string to 90° and release it while timing.Stop the timer after 4 complete oscillations are achieved.Average and record the timing.Change the length of the rope according to guidelines below.Repeat the process 10 times.

My variable is the length of the thread. We will vary the length of the tread by 5cm. We will start with a thread 10cm long and will gradually build up: 10, 15, 20 cm and so on.


I will ensure that the practical work that I do is safe by wearing safety goggles, putting the apparatus behind a safety screen and by gently releasing the ball.

Fair Test

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There may be an odd result at 75 cm; this may be because the timing is not accurate.


I could further my investigation by doing more different lengths to achieve more accurate results.

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