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What Factors Affect The Period Of Swing Of A Pendulum?

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What Factors Affect The Period Of Swing Of A Pendulum?


For my practical coursework I have to find out how mass, amplitude or the length of the string affect the period of a pendulum. I have decided to find out how mass affects the period.



  1. Set-up the equipment as in the diagram above.
  2. Swing the pendulum with 100g weight on the end from an amplitude of 20cm and record how long it takes for the pendulum to got through 20 cycles and divide it by 20.
  3. Repeat 2 more times with 100g.
  4. Repeat steps 2 and 3 with 200g, then 300g, then 400g and then 500g and record the results.

Fair testing

  1. I must keep the length of the string at 50cm
...read more.


Although I think that mass does not change it I do however think that the length of the string will because:

Period = 2 X∏ X length of string

                  Gravitational pull (9.8)

This means if you change the length of the string this affects the answer to the equation – if the string is longer the answer (time)

...read more.


td class="c4" colspan="1" rowspan="1">






Attempt 3 (20)






Attempt 3 (1)














I conclude that my prediction was correct. I found out that when you change the mass of a pendulum it does not affect the period. The period did vary slightly but not due to the mass. I believe that what I explained in my prediction was correct and that that is the reason for my results.


I think that the experiment went well, however if I were to do it again I would allow myself more time so that I could see if my prediction about the length of the string was correct. Also I would use lighter weights, as the heavier weights were very hard to get 20 swings out of without hitting the table.

...read more.

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