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

How the length of string affects one oscillation of a pendulum.

Extracts from this document...


Physics Coursework: How the length of string affects one oscillation of a pendulum By Will Rudd How the length of string affects one oscillation of a pendulum Plan: In my investigation I will try to find out what affects the oscillation of a pendulum, I will try to quickly and simply work out what could actually be a variable. I already know that the period (the time taken for the pendulum to swing there and back) is the dependent variable, meaning that it's dependant on the other variables, the only possible variables are: * Weight/mass of the pendulum, * Distance that the pendulum is pulled back and * Length of the string To find out which of these variables could effect the period I carried out a short series of preliminary tests. Weight/Mass: For the weight/mass, the distance pulled back is 30cm and too keep the constant the string must remain the same length, hence the only variable that I changed was the weight by adding 50g, making sure this is a fair test. I allowed the pendulum to oscillate 10 times and then divided the time by 10 to work out the average oscillation time, I repeated each test twice and then worked out the average. These were my results: Mass (in grams) Time taken for ten periods/oscillations (in seconds) Test 1 Test 2 Average 50 14.38 14.37 14.375 100 14.32 14.58 14.450 150 14.06 14.40 14.230 From this test just using a human eye and a simple stopwatch, the numbers for the different weights (50, 100, 150) ...read more.


as well as the distance the string is pulled back (if the distance that the string is pulled back is doubled so is it's GPE) I want my results to be as accurate as possible but using the available equipment, it will be hard to have a complete degree of accuracy. In my investigation I will be using: * A clamp * Length of string * Ten gram weights (x5) * A stopwatch * A protractor * A one-meter rule and * A weight holder. I will set out the apparatus as below: Safety will not really be a big issue in these sets of experiments, but I will still keep a safe distance from the pendulum when it is swinging. This is the only real safety precaution I will need to take. Now that I have worked out which variable I will be using, I will simply follow the steps that I took when carrying out my preliminary test but make sure I take more time and they are more accurate. I will be measuring the time taken for 10 oscillations and then divide the time taken by 10, giving me the time for one oscillation. I will repeat each test twice and then work out the average. To keep my tests fair I will only change the length of the string. I will be using the human eye and a simple stopwatch (goes to 2.d.p) ...read more.


The first of the two problems was, the way in which I had tied the knot on. This resulted in the pendulum (instead of swinging in a straight line) it slightly veered to the left, if doing the experiment again I would simply clamp the string in horizontally stopping the shorting and lengthening of the piece of string. The second problem that I encountered was the momentum of the pendulum rocked the clamp. To counteract this I would have simply added weights to the bottom of the clamp. Another mistake that could have caused the anomalous result/s if that I only measured the string before I had attached it to the clamp, causing a tightening and loosening of the string. I chose the best-suited apparatus i.e. I used the most accurate stopwatch available etc. I repeated each test 3 times to clear up anomalous results, and for my preliminary results I felt that 3 results would be sufficient, I also thought that repeating them twice would be adequate. But the anomalous result in my preliminary test (length of string) showed I was wrong. All of the preliminary results were pretty much accurate but throughout the experiment there was a slight variation in repeated result, this could have been due to either equipment or simple human accuracy. I would say that my investigation was not exactly limited. If I were to extend this experiment then I would repeat the experiment either changing the weight of the pendulum, or change the lengths of string that I used, to check wither these variables would change my results. ...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 Forces and Motion 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 Forces and Motion essays

  1. Marked by a teacher

    Investigating how the Length of a Pendulum affects its Period

    3 star(s)

    I will measure the correct length of string with the wooden rule. The string will be checked and the bob will be released. Then it will swing for a few periods so I can get used to the speed and timing and then I will start the stopwatch.

  2. Marked by a teacher

    Additional Science - What affects the period of a pendulum?

    3 star(s)

    may have been accurate but the person who dropped the ball bearing may have misread the protractor by a few degrees, which would affect the final results. There are also several outliers here, due to the stopwatch keeper's reaction. SUMMARY FROM PRELIMINARIES: From the results gathered from the preliminaries, I

  1. Determining the acceleration due to gravity by using simple pendulum.

    The acceleration of gravity is measured by allowing a steel ball to fall, after starting at rest, and then applying the equation for accelerated motion. A free fall timer is used in this experiment PREDICTION I predict that as the length, L increases the time taken would increase too because these variable are proportional to one another.

  2. Period of Oscillation of a Simple Pendulum

    There will be a total of seven results. To make the test a fair one, each experiment will have a length of 50cm and an angle of release of 30�. This should ensure that the results are accurate enough to find out if the mass of the pendulum bob affects the oscillation.

  1. The determination of the acceleration due to gravity at the surface of the earth, ...

    If not hanging at 90�, the wooden blocks need to be adjusted, either in the clamp or in relation to one another, so to achieve this. I also realised that it was necessary to make sure that the string is clamped vertically between wooden blocks.

  2. Damped Oscillation.

    Normally we use to represent . As I assume that there is no side force, the force term should be 0 in this particular modeling. Now the equation can be written as . Because the damping is due to the resistance in the liquid, the damped term is the resistance.

  1. Mechanical Properties of a Meter Rule

    Once some weights were added the set up looked unstable and dangerous as the rule started to twist. This could have been because the clamps were no tightened at the same strength. 4. Once the weights were added, the level of deflection appeared to be different.

  2. Strength of a string practical investigation

    strands to extend more as there are more mass in the thicker strings as they have a larger volume and more mass, so more molecules, so thus further extension. I predict the tensile strength of the strings with more stands to be higher.

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