[AS] Help, please! Edexcel Physics Controlled Assessment

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ColeNate
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Hello!

I am starting my Edexcel AS Physics controlled assessment shortly on this topic:

"Case Study: finding out the properties of spider silk. Research breaking stresses and strains. Compare breaking forces of steel and spider silk, answering the question of why spider silk is so strong. Be careful to state the relevant parameters for this comparison.

Practical: How much energy is stored in an elastic band at full stretch? Compare the energy stored in an elastic band per unit volume at breaking point with that of spider silk at breaking point."

For the practical, I'm thinking of doing something similar to this:
http://www.science-spark.co.uk/isa/i...ubber_band.pdf

I'm not sure what the main sources of uncertainty and systematic error are in this experiment - perhaps the air resistance?

I am also unsure of what other variables need to be controlled.

For an appropriate range of measurements of mass added to the elastic band, would 0-0.5kg be okay?




For the case study, I need to produce 500-600 words on relevant physics principles using 3 sources, use specialist terminology, provide a graph/diagram, comment on the benefits/risks (of the spider silk I guess!) and explain how it relates to the case study.

If anyone could give me some tips and help I'd greatly appreciate it!
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uberteknik
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(Original post by ColeNate)
Hello!

I am starting my Edexcel AS Physics controlled assessment shortly on this topic:

"Case Study: finding out the properties of spider silk. Research breaking stresses and strains. Compare breaking forces of steel and spider silk, answering the question of why spider silk is so strong. Be careful to state the relevant parameters for this comparison.

Practical: How much energy is stored in an elastic band at full stretch? Compare the energy stored in an elastic band per unit volume at breaking point with that of spider silk at breaking point."

For the practical, I'm thinking of doing something similar to this:
http://www.science-spark.co.uk/isa/i...ubber_band.pdf

I'm not sure what the main sources of uncertainty and systematic error are in this experiment - perhaps the air resistance?

I am also unsure of what other variables need to be controlled.

For an appropriate range of measurements of mass added to the elastic band, would 0-0.5kg be okay?




For the case study, I need to produce 500-600 words on relevant physics principles using 3 sources, use specialist terminology, provide a graph/diagram, comment on the benefits/risks (of the spider silk I guess!) and explain how it relates to the case study.

If anyone could give me some tips and help I'd greatly appreciate it!
I'm sure you would be grateful!

Asking for and providing help to someone taking a controlled assessment could be easily construed as cheating and you may well be opening yourself up to potential sanctions.

For instance, ALL of your sources of information must be disclosed. This includes anything you gain from 'social media' websites such as TSR. Not just the website address but the full link to the source of the information obtained in this thread for instance, since you have asked very specific questions relating to the experiments you intend to conduct.

This is the major reason why Ofsted is changing the examination format to remove dependence on controlled assessments and move to a linear examination at the end of the course.

If you have not already done so, you should make yourself acquainted with the rules for controlled assessments.
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