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Physics Pendulum Internal assesment

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Measuring gravity using a pendulum


In this experiment, I will be measuring the time it takes for a pendulum to oscillate and use the data to calculate the acceleration of the ball. With small swings a period of motion can be described using the equation:

so this equation can be arranged to find gravity by using the pendulum to work out the period (T).


I predict that the end value of gravity should always be close to 9.8 due to tests, as we know that acceleration due to gravity is approximately 9.81 image08.pngimage08.png, also the period will have increased due to the length being longer in the string

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  1. Fix the string with the ball to a clamp as shown in the diagram above and afterwards the whole thing should look like the picture.
  2. Practice timing and using the pendulum, make sure you measure as soon as the string passes through the centre point then out to the right, then to the left and then back to centre, and that counts as one full period, make sure that the string stays in one plane and doesn’t wobble.
  3. Prepare a results table with columns l, T10, T and T2 and gather 8 sets of readings.
  4. Measure the Length of string.
  5. Release the pendulum and record for 10 complete periods.
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image12.pngimage12.pngX 100 = 6.02 % (2 d.p)

And that is not too big as to what I thought the value would be and it relates to my hypothesis so I wouldn’t need to change it. However,

if I was to take this experiment again I would make sure that I will measure the angle that the ball is released from and that there is no change in the plane of the pendulum and make sure I take multiple sets of readings at a time.

...read more.

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