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Physics Investigation on Hook's Law.

Extracts from this document...

Introduction

Aim:The aim of my investigation is to find out if Hooke’s Law can be proved with a steal spring.

Equipment: Ruler, springs(x4), Base clamp, Weights (up 13N), boss clamp, goggles

Diagram:

Safety feature:

  • Pupils were not cramped together as they needed room to work.
  • Goggles were worn to prevent eyes from getting damaged.
  • People could not play with equipment.
  • People could not run around in the science laboratory.
  • Desks were cleared

There were not too many strict safety precautions used, as the only potential danger was if the spring snapped.

Prediction:My prediction is that Hooke’s Law can be proved through a steel spring, as if the weight on the spring will increase so will the extension.Hooke’s Law found that extension is proportional to the downward force acting on the spring.  This tells me to find elastic limit when I am doing the experiment using the formula    f=ke, which will give me the spring constant.                                                                                                          I predict that the extension of the spring will be in steady steps up until the spring is stretched beyond the elastic limit. At that point the spring will have reached the point where Hooke’s law is no longer accurate.                                                                                                                

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Middle

Results:  I am going to produce precise and reliable evidence by recording my results in a table and plotting a graph. I also hope to carry out the experiment 4 times and take an average to increase the reliability of my results, and instead of drawing 4 tables I have simply drawn an average table of results, which I have also used for drawing my graph.

I used all the equipment safely, following all of the safety rules and observing the experiment entirely.

My results are meaningful as they support my objective. I placed them in a table to make them easier to identify.  I did not need to take repeat readings, as I found them reliable and

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Conclusion

I do consider my results good enough evidence to support my conclusion as most of them followed a steady pattern and showed that if you stretch something with a steadily increasingforce, then the length will increase steadily too. Some of my results were anomalous as when they were approaching the elastic limit the results started increasing in different amounts.  If I would carry on with my experimentation, I would find out what happened after the limit of proportionality had been reached using Hooke´s law, achieving results until the spring became straight and eventually breaking. However the change in length at this stage is very small and special measuring equipment would be needed in order to conduct a reasonable experiment.

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