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Pendulum.The length of the pendulum will affect the period (T). An increase in length will produce an increase in time. This can easily be seen when I look at the results table.

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The aim of this experiment is to investigation of gravity by sample pendulum affects the time for complete swings.


A pendulum is a device which consists of an object suspended from a fixed point that swings back and forth under the influence of gravity. This effect is known as gravitation. However simple it may seem, this structure is very beneficial in our everyday life for it is used in several kinds of mechanical devices such as the all popular grandfather clocks. In addition to this, a pendulum could determine the local acceleration of gravity. This is the case, as the strength of gravity varies at different latitudes and as gravity is one of the main forces acting on the pendulum, the acceleration of gravity could be noted. Further uses of the pendulum are found in the field of astronomy for some have been used to record the irregular rotation of the

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Let the bob swing backwards and forwards 20 times oppressed Then stopped the pendulum swinging and recorded the times. Then I repeated experiment with the same length 3 times.

Fair Test:

To make the experiment as fair as possible the same bob and equipment were used for each experiment. The length of pendulum was measured from the base of the split cork to the middle of the metallic bob. The angle at which the bob swung also had to be the same.


There are many accidents that could happen if this experiment was not carried out safely; below I have outlined a few simple guidelines to prevent such accidents occurring.




Bob swing

Could hit someone

Do not swing the bob from large angles

Clamp stand

Could fall over and hit someone

Make sure a large mass is holding it down

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I used the method proposed in my plan, taking three readings of each value and measuring the time taken for 20 oscillations rather than for 1. During the experiment, I observed that each oscillation for the same length of string seemed to be equal. This showed that the pendulum did not slow down as the number of oscillations increased. I took the safety measures described in my original plan.

During the experiment I was careful to use accurate measurements in order to obtain sufficiently accurate results, for example:

- The string was measured with a meter ruler, to the nearest cm, to
ensure that each measurement had a difference of exactly 10cm.

- The angle of amplitude will be measured with a protractor to the
nearest degree to ensure that the angle remains constant throughout
the experiment.

- A stopwatch will be used to measure the period accurately. The period
was measured in seconds, with the stopwatch measuring to a degree
of accuracy. However, I have rounded up each time to the nearest second to give appropriate results.

...read more.

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