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IA Lab report rubber bands

Extracts from this document...

Introduction

Range of a rubber band

Erik Thörnblad, IB06A-PDP

2007-03-04


Aim

The aim of this experiment is to find how the amount of stretching, when shooting a rubber band, affects the length of the shot.

Hypothesis

When you stretch an elastic rubber band, you store potential elastic energy inside it. When the rubber band is released, the potential elastic energy will be transformed into the same amount of kinetic energy. This will cause the rubber band to move, and the more kinetic energy we have, the longer the rubber band will fly. Thus, the more stretching performed on the rubber band, the longer it will fly.

Equipment

Stand, double muff, 2 flags, 2 rubber bands with an circumference of 0.20 respective 0.22 m, measuring tape with an uncertainty of image00.png, and a ruler with an uncertainty of image00.png.

Procedure

The experiment was performed indoors at normal room temperature. We of course began to set up our equipment in a proper way. (see picture) The setup ensured that we would have the same angle of the rubber band in each shot. Three different lengths between the flags were used, 0.15 m, 0.20 m and 0.25 m. When the rubber bands were attached to the flags, the total circumference of the rubber bands then became 0.30 m, 0.40 m and 0.

...read more.

Middle

Length: 0,10

0,15

4,60

3,80

4,10

4,50

4,00

4,20

28,00

Rubber 2

0,04

1,75

1,00

1,70

1,20

1,50

1,43

35,75

Circumference: 0,22

0,09

1,80

2,10

2,40

2,10

2,40

2,16

24,00

Length: 0,11

0,13

2,70

2,30

2,40

2,60

2,35

2,47

19,00

All lengths are in meters.

The following result was reached when investigating the shot length on different stretching lengths:

These values are then inserted in a graph, which looks like following:

image02.jpg

...read more.

Conclusion

The landing point of the rubber band could, and should, have been better controlled. Our result is only correct to the nearest five centimeters, and that is not very exact. Eye measuring was used this time, but if we would have performed the experiment on some kind of sand surface, the rubber band would have left a clearly visible trace, and we would have known the length of the shot to the nearest centimeter, if not to the nearest millimeter.

If all these improvements would have been made, the experiment would have generated both a more secure conclusion, but also a wider one. Now the second rubber band was just a waste of time, as it did not generate any results which could be used in the conclusion. It could instead have helped to improve the experiment.

...read more.

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