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# Pendulum Investigation.

Extracts from this document...

Introduction

Task: To find out if the length of the string or the mass that it carries affects the movement and the speed of which it swings.

Variables: The weight, length of string, wind (caused by air conditioners), how much the string is twisted, friction between thread and clamp.

Invariables: Clamp, string, measuring equipment, stopwatch, person who does all the measuring and timing, weights, position where knot is tied, angle where it is released (amplitude).

Prediction: We predict that as the mass that the string carries increase, the speed that the sting swings will also increase. We think that this is because as there is more weight pulling it downwards as it gets higher. Also, we predict that as the length

Middle

10.77

.74

30

5.45

10.34

.71

40

4.88

10.12

.72

50

4.45

9.87

.67

60

4.12

9.21

.66

70

3.85

8.98

.62

80

3.63

8.72

.62

90

3.44

Length of String

Mass = 30g

 Time for 10 Swings (secs) Time for 1 Swing (secs) Length of String (cm)

Conclusion

If we did this again, I would measure the length of the string three times by three different people before we commence the experiment, even though this might be very frustrating and time consuming, it will ensure better accuracy. Also, we will measure the string only when it has stopped swinging or else it would be inaccurate. Thirdly, we need to time with three different people in all three repeats of the experiment to ensure greater accuracy.

Finally, I think overall that this experiment has been more or less successful as the results tend to agree with the theoretical times. The hardest part of this activity was the actual tying the knot onto the clamp so that it wouldn’t fall 1.2 way through the experiment!

Godfrey Yuen 10T

This student written piece of work is one of many that can be found in our GCSE Forces and Motion section.

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