• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Factors affecting the period of a Pendulum.

Extracts from this document...


Physics Coursework Factors affecting the period of a Pendulum Possible Variables: Angle of pull back - I did a quick experiment (see below) and proved that this makes no difference. Type of string - this is a discrete variable and would not give good results for a graph. Mass on the end of the String - this would be a good choice, but after a quick experiment I decided that the length makes more difference. Length of the String (distance of centre of mass from pivot) - I will investigate this variable. Experiment to show the angle of pullback makes little or no difference Length: 50cm, Mass: 200g Angle of pullback/degrees Time for five oscillations/sec Attempt 1 Attempt 2 20 7.05 6.98 50 7.01 7.10 These readings are very similar and although this doesn't prove that the angle of pullback has no effect, it shows that within the accuracy of this experiment it has no effect. I think that this is because if you pull it back further, then although the mass has further to fall, all that time it is accelerating and so it moves faster. ...read more.


There were two readings that were obviously very wrong which I omitted and repeated. I measured the length of the string before and after to check that it had not slipped. Distance of centre of mass from pivot/cm Time for 5 oscillations Attempt 1/sec Attempt 2/sec Attempt 3/sec Average time for 5 oscillations/sec Average time for 1 oscillation/sec 20 4.44 4.50 4.49 4.47 0.895 30 5.43 5.45 5.49 5.46 1.091 40 6.14 6.24 6.19 6.19 1.238 50 7.00 7.00 7.10 7.03 1.407 60 7.44 7.58 7.48 7.50 1.500 70 8.27 8.25 8.29 8.27 1.654 80 8.78 8.68 8.68 8.74 1.748 90 9.44 9.32 9.35 9.37 1.874 100 9.86 9.88 9.84 9.86 1.972 110 10.49 10.50 10.54 10.51 2.102 120 10.92 11.00 11.03 10.98 2.197 130 11.43 11.35 11.37 11.38 2.277 Conclusion I predicted that the period would be proportional to the square root of the length of the string so to test this I drew a graph of the square root of the length against the period, hoping that I would get a straight line through the origin, and with this I would be able to work out what k is (in the formula p = kVL). ...read more.


The measurements of distance were to the nearest two centimetres and were measured from the centre of mass (I considered the string to be of negligible mass when finding the centre of mass, this may have been an oversight, but I could see no easy way of weighing it and keeping it straight out). The measurements of time were measured to the nearest hundredth of a second, but my reaction time would have made the last digit mostly irrelevant. However, I thought my reaction time would have been similar for each reading that it would add an extra bit of accuracy, and as the readings were generally so close, I left it in there. As I said in the conclusion, every point was within one per cent of the straight-line p = 0.197*V130. This was very pleasing, and showed the accuracy of the experiment. Wind resistance obviously didn't play a huge part, and the string was obviously thin enough not to impede the swing of the pendulum. Resources used: I looked up the formula on the internet site below, but as I understood it I put it in my hypothesis http://www.educationplanet.com/search/redirect?id=25782&mfcount=1&mfkw=pendulum&startval=0 H.E.Guinness 5/3/2007 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Classifying Materials section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Classifying Materials essays

  1. The role of mass customization and postponement in global logistics

    variety may be offered at lower total cost - this is the principle of "mass customization" To manage inventory effectively, companies not only must anticipate demand, but also when it will taper off. Not having sufficient inventory early in the product cycle can cost market share.

  2. The Factors Affecting the Deflection of a Spaghetti Bridge

    * Measure the deflection (lowest point the spaghetti reaches) on the ruler. * Repeat steps 4 & 5 increasing the mass by 10g each time until the spaghetti breaks - record the deflection for each mass. * Repeat experiment for spaghetti lengths of 15cm and 10cm.

  1. An experiment to investigate the factors that determine the amount of energy released when ...

    I have therefore decided to choose alcohol molecules on which the OH molecule has bonded with the first carbon atom in the chain. This will contribute in making the experiment a fair test, even though different isomers will not affect the readings.

  2. factors affecting the errosion of a magnesium statue

    The increased concentration will increase the number of collisions, therefore more reactions and acid rain. Acid rain may have a great effect on the rate of corrosion. Fossil fuels give off a small amount of Sulphur; "S". Acid rain will also be a mix of sulphurous and sulphuric acid and a small amount of nitric acid.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work