Before the seventeenth century, the tendency of a body to fall towards the earth, i.e. its weight, was regarded as an inherent property of all bodies needing no further explanation.
This all changed some time during 1661 and 1666, when seeing an apple fall from a tree inspired Sir Isaac Newton to the thought that a single idea could explain why objects fall to the ground and why the moon revolves around the earth. This force is now recognised as gravity. This "gravity" is what exerts a downward force on any free falling body causing it to accelerate, regardless of its weight, towards the earth, Looking back on my investigation, it is clear that a variety of different methods for calculating the acceleration due to gravity can be used, some more successful and accurate than others. The least accurate of my experiments was part 1 of my light gate method. The values gained for this method were the only values to fall outside the accepted values for gravity in Scotland of between 9.815ms-2 and 9.819ms-2. The reason the trap door method achieved such a good outcome was largely due to the large percentage errors involved in this method. The ticker timer although an older method, still proved to be able to calculate a good estimation for gravity. The most accurate method was a close contest between the latter part of the light gate experiment and the simple pendulum. Both with a very little amount of uncertainty clearly fell within the accepted values for gravity in Scotland.

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