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Investigate the strength of a snail's mucus on different surfaces

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Introduction

GROUP 4

SNAILS

Physics: To investigate the power of a snails mucus on different surfaces

Chemistry: to determine what percentage of a snails shell composed of CaCO3

Biology: To investigate taxism in snails

13 September 2004

Rafael Bravo

Ana Gosnar

John Kjeldgaard

Marianne Sangster


PHYSICS

To investigate the strength of a snail’s mucus on different surfaces

Planning A

Our research question:  At which angle does the snail’s mucus fail to hold the snail and how different surfaces (solids and liquids) affect it?

Hypothesis:

We predict that the snail’s mucus is rather strong; therefore it can hold a snail at quiet steep angles. Since a snail is rather small (approx. 20 g), we predict that the mucus is subsequently strong enough to hold the snail until the angle is rather large (150°). We also predict that different surfaces will affect the mucus’s strength. If the surface is smooth the snail will not grip on to it as strong as if the surface would be rough. Also

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Middle

2

6.7

Yes

Yes

Yes

Yes

Yes

Yes

3

11.10

Yes

Yes

Yes

Yes

Yes

Yes

4

12.3

Yes

Yes

Yes

Yes

Yes

Yes

5

15.97

Yes

Yes

Yes

Yes

Yes

Yes

Snail

Mass(g)

Δm   0.1g

Does the snail stick to foam surface at

30°

ΔΘ   5°

45°

ΔΘ   5°

60°

ΔΘ   5°

90°

ΔΘ   5°

105°

ΔΘ   5°

150°

ΔΘ   5°

1

3.3

Yes

Yes

Yes

Yes

Yes

Yes

2

6.7

Yes

Yes

Yes

Yes

Yes

Yes

3

11.10

Yes

Yes

Yes

Yes

Yes

Yes

4

12.3

Yes

Yes

Yes

Yes

Yes

Yes

5

15.97

Yes

Yes

Yes

Yes

Yes

Yes

Snail

Mass(g)

Δm   0.1g

Does

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Conclusion

If I were to repeat this experiment I would actually avoid using any animals, I would advise the group to choose a non-living item. But if the rest still wanted our Group 4 to focus on snails I would pick an experiment where I would be measuring for example the average speed of a snail or how strong the snail is using weights.

    5/4/2007

Rafael Bravo and Ana Gosnar

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