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The Pendulum

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Introduction

ThePendulumCoursework

Planning Section

Aim: The aim of this experiment is to find out if a certain variable effects the period of a pendulum. The variable we will be testing in this project is the length of the string.

Prediction: I predict that the longer the piece of string, the longer it will take the pendulum to complete one period. I also predict as the length of the string goes up by 10cm, the period will increase by roughly 0.15 seconds.

Apparatus: -Piece of string (longer than 95cm)

             To attach and swing the weight ball off.

  -Ruler

                To measure the piece of string.

 -Protractor

          To measure the angle between the string and the floor so

                         It is the same every time.            

                         -Stop watch

To measure how long the period is

     -Pencil/Pen

To record our results

                         -Weight ball (40g)

To attach and hang on the end of the string to weigh it

                          Down and to make it into a pendulum.

                         -Clamp

To attach the pendulum 2 the table so it has room to

                          Swing above the floor.

                         -Clamp attachment fitting

To attach the string to the clamp.

Method:

  1. Firstly, we have to determine, how many lengths we ant to compare, and also (in cm) how long each piece of string is.

We have decided to go up in fives i.e. 5, 10, 15 etc…                                                                

...read more.

Middle

image01.png

Preliminary Trial

Length (cm)

Trial 1

5

0.91

10

0.95

15

1.07

20

1.18

25

1.20

30

1.22

35

1.42

40

1.47

45

1.58

50

1.45

These results aren’t very accurate and don’t really follow a certain pattern. Also, I don’t think they cover a big enough range so we don’t really get a chance to see how length effects the pendulum later on when the string is longer. Therefore, We are going to change the difference between each length from 5cm –10cm.

This is the new Method:

1) Firstly, we have to determine, how many lengths we ant to compare, and also (in cm) how long each piece of string is.

We have decided to go up in tens i.e. 5, 15, 25 etc…                                                            

2) Then we have to draw up a table o record all f our results.

3) Next we have to collect all our apparatus.

4) Firstly, we will measure a piece of string to the length required, plus a bit for excess to tie around the weight ball etc…

5) We then will set up our clamp and attach the string to the clamp attachment and in turn, attach the weight ball to the string.

6) After all is set up, we will need to wind up the string around the clamp to the lowest measurement ready to begin the experiment. (we will measure it with a ruler)

7)

...read more.

Conclusion

This shows good and accurate timings, which is very good n the fact we’re trying to compare the length of string and the how it affects the time it takes the pendulum to complete one period.

The rule for this graph is, as the length of string increases, the time it takes the pendulum to complete period increases at the same time. My graph clearly shows this as the line of best fit goes up diagonally right.

t² = (4π²/g)L.

39.5/39.5=1

1 times 5 = 5

Therefore should be at point 5 (0.5) on the graph.

Therefore our result is inaccurate.

However, it does relate to my background research because it said that length would be the only variable able to change the length of the period. Also that the longer the string the longer it would take to complete a period. This means it does link closely to the background research, just not extremely accurately. The main theory does.

Conclusion

The rule for this graph is, as the length of string increases, the time it takes the pendulum to complete period increases at the same time. My graph clearly shows this as the line of best fit goes up diagonally right. In my prediction I said that it goes up by roughly 0.15 in every 10cm but I think its now more closer to 0.1 seconds in every 10 cm.

...read more.

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