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The Pendulum Investigation

Extracts from this document...

Introduction

Lewis WrightThe Pendulum Investigation25th July 2001

Aim:

To calculate the periodic time for varying lengths of a pendulum.

Introduction:

I am planning to begin an investigation to measure the period of time for a pendulum of any weight as that doesn’t matter, to take one swing. The measurements will be made by hanging a pendulum or bob from a clamp using different measurements of string and seeing how much time is taken for one swig using a stop clock.

Fair Test:

I will make the experiment fair by using a piece of paper stuck on the clamp with the angle from which I will start my pendulum swinging making sure I and I alone will count the amount of swings. I will also make sure that I stand the same place as I count so I can see properly where one swing ends and the next one starts.

Equipment:

I have chosen my equipment carefully, I am going to use a clamp, a stand, a stool, a ball of string, some writing equipment, drawing equipment, a patractor, scissors and a pendulum with a hole in it.

Diagram Of Equipment:

Prediction:

Middle

Results:

Time for 10 swings sec

 Length in m 1 2 3 4 5 Average time for 10 swings Average time for 1 swing 1.2 m 23.07 23.07 23.2 22.04 23.04 23.26 sec 2.33 sec 1.3 m 25.4 25.7 24.8 24.4 24.3 24.92 sec 2.49 sec 1.4 m 27 26.9 27.4 26.8 27.5 27.19 sec 2.72 sec 1.5 m 28.3 27.8 28.4 28.5 28.3 28.26 sec 2.82 sec 1.6 m 27.2 29.8 30 24.3 29.4 29.14 sec 2.91 sec 1.7 m 30.7 30.1 29.1 29.8 30.8 30.00 sec 3.00 sec 1.8 m 31.8 31.2 30.1 30.9 31.6 30.60 sec 3.10 sec 1.9 m 31.8 32.3 31.9 30.9 31.6 32.00 sec 3.02 sec 2.0 m 32.3 32.4 31.5 33.1 32.6 33.40 sec 3.34 sec

This chart proves my prediction was correct however my predicted table was quite a way off.

Conclusion:

The graph has a strong positive correlation and has two anomalous results, this graph means the longer the piece of string the longer the time taken for one swing.

Evaluation:

I thought this experiment went very well and the test was as fair as

it could be. The graph and table were very accurate however the

first graph I did in rough took me a long time to do. I improved my

results by

Conclusion

Results:

temperature

0*C   20*C 30*C  40*C  50*C   60*C

 Time Taken in mins - 2.03 1.48 0.58 1.05 1.28 Reaction yes/no No yes yes yes yes Yes

Graph to show amount of time taken for the pepsin to break down at varying temperatures.

These results prove that my prediction was correct and that the reaction happened faster around 40*C.

Conclusion:

In conclusion the graph has a negative correlation. The smallest time taken was 58 seconds at 40*C which means it was the best temperature for the pepsin. The worst time was at 0*C this was the worst times because the reaction was so cold it most probably froze.

Evaluation:

This experiment was rather hard, it was very hard to get the temperatures right in the water bath and to make a fair test was quite a challenge. The results are also very hard to get as you have to start the stop clock as soon as you add the pepsin to the test tube. I made my results as accurate as possible by repeating the process over and over again. The method was very well done and I knew what I had to do as soon as I read the title. The problem with my results are they aren’t as accurate as they could be and can’t hold a firm conclusion.

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