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hook's law

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Introduction

Hooke's Law is when forces are applied to a solid object and it can result in extension or compression. Hooke's Law is able to predict how a spring (or other stretchable object) would behave when force is applied to it. I aim to show how much force (N) strips of supermarket weights bags will take before it reaches its elastic limit and whether the width of the strips can alter the results. I am going to do a simple experiment that involves cutting a weights bag into strips which are all different sizes, 25cm x 5cm, 25cm x 10 cm and 25cm x 15cm. Then I am going to add 100g weights to the length of weights bag until I reach its elastic limit. ...read more.

Middle

The reason I should obtain accurate results is because I know that the strip should stretch at equal amounts until the strips have been stretched beyond their elastic limit. I will have to be careful to make sure that if the strip of weights bag breaks the falling weight could not be a danger to anyone. I will be taking minor precautions and shall not be adding ludicrous amounts of weight onto the beam. The measurements that I will be taking must be done as fairly as possible or the results shall not be accurate. The equipment that I will use should be checked to make sure that there is nothing wrong with it; I will make sure that I use the best equipment available to me. Diagram Equipment list * Clamp and Stand * Weights (In different proportions) ...read more.

Conclusion

Also being aware of the movement in molecules that are found in solids was helpful. This helped me come to the conclusion that due to the amount of pressure on certain parts of the strip a wider strip would be able to withstand more pulling from the weights. Evaluation The experiment managed to produce some decent, accurate results so that I was able to produce a graph and come to a good conclusion. All of my results seemed to be very accurate. They all followed a pattern until they reached the elastic point. After they had hit the elastic point the results became harder to record because they were so varied. Also some of the measurements could have been slightly inaccurate because I was using a 30cm ruler. To make sure that all my results were accurate I would have to have more time and be able to repeat them again. ...read more.

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Response to the question

The aim which I am looking for a response is ‘how much force (N) strips of supermarket weights bags will take before it reaches its elastic limit and whether the width of the strips can alter the results’. The candidate ...

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Response to the question

The aim which I am looking for a response is ‘how much force (N) strips of supermarket weights bags will take before it reaches its elastic limit and whether the width of the strips can alter the results’. The candidate responds to the question well by stating a prediction to methodology with clear explanation; ‘The reason I should obtain accurate results is because I know that the strip should stretch at equal amounts until the strips have been stretched beyond their elastic limit’. The candidate also notes factors which need to be taken into consideration when investigating Hooke’s law, which is good. However, the candidate could respond to the question much further by stating explanations in some sentences for example the actual hypothesis ‘I Predicted That The Elastic Bands Would Snap’, which can be improved by stating why the elastic band would snap, and at what weight they are likely to snap. Overall, a lot more scientific detail in relation to the aim is needed to gain a higher rating.

Level of analysis

The analysis of the investigation was quite weak, especially with regards to the conclusion and evaluation, the candidate could have analysed why ‘The difference in width did affect the elastic point on the weights bag strips’, which would have easily improved the rating. The candidate also mentioned that they were able to predict the results ‘Due to having foreknowledge of Hooke's Law’, although any foreknowledge was not conveyed to a high level, this showed that the candidate has gaps in their knowledge/research of Hooke’s law, which brings down the rating considerably. To improve the evaluation the candidate could have mentioned how they would have improved their results to gain more accuracy; they could have also spoken about repeating the experiment or comparing results to increase reliability, this would have presented a strong scientific analysis. The actual results in the table could have been analysed and interpreted to show why they happened and how contributing factors may have influenced them. There should have been a line graph to show the elastic point of each elastic band, which would have been additional way to present the data, which would have improved the scientific backing of the investigation. The length x width measurements should have been within the actual results table to improve clarity.

Quality of writing

Overall the candidate’s written English was adequate; however there was some unnecessary capitalisation, e.g. ‘I Predicted That The Elastic Bands Would Snap’, which decreased the rating. More scientific terminology was definitely needed, and possibly the use of subheadings to clarify the methodology. Within the table ‘grams’ should have been shortened to ‘g’, although this doesn’t matter too much.


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