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Experiment To Determine How the Change In the Force of the Weight Affects the Depresion of the Ruler.

Extracts from this document...

Introduction

EXPERIMENT TO DETERMINE HOW THE CHANGE IN THE FORCE OF THE WEIGHT AFFECTS THE DEPRESION OF THE RULER.

In this experiment I am going to investigate how the change of in the force of the weight affects the depression of the ruler. This experiment will mainly be based on Hooke’s law and the moment’s law.

METHOD

• First we are going to collect our apparatus and set it up on the table. I will clamp a 1m ruler onto the table parallel with 50cm of the ruler hanging over the edge.
• We will then place a piece of wood over the ruler to make the ruler is secure. We will lock the wood to the ruler using the G-clamp...
• We will then attach another ruler at the end of the ruler on the edge of the table. This will help us measure the length between the ruler which has bent downwards and the straight ruler attached to the clamp. To determine the depression of the ruler.
• We will attach a piece string to the parallel ruler at the 950mm mark. We will hang the weights on that piece of string.
• We will keep changing the force of weights each time keeping the string at the same position. We will repeat the experiment 3 times and achieve an average.
• We will then record our results on a table of results.

APPARATUS USED

• 2× ruler
• String
• G- clamps
• Wood
• Weights
• Clamps

WHY?

• I will use two rulers in this experiment, one will lie parallel on the table, and the other will stand vertically on the floor measuring the length of depression.
• The piece of string will tie the weights to the parallel ruler.
• I will use a G-clamp to secure the piece of wood to the ruler.
• I will a block of wood to secure the ruler to the table.
• I will use weights because it’s a suitable object which will give a good depression of the ruler.
• I will use clamps to secure the vertical ruler on the floor so the measurements are accurate.

To make this experiment as productive as possible I am going to vary the force of the weights from 100g to 1000g. By varying the force of the weights to this extent I will achieve useful and a wide range of results to which I could achieve a suitable conclusion.

In order to keep my results as accurate as possible I am going to repeat the experiment three times. I will then achieve an average as the final result.

I am going to do the following things in order to make this experiment a fair test:

• I will be using the same apparatus throughout the experiment e.g. string, clamp, wood etc
• The same member of my group will be determining at what position the ruler has depressed to.
• I will be making sure that the piece of string is at the same position at all times during the experiment.

Middle

From this scientific knowledge I have also come to a prediction that as the force of the weight increases, the angle and depression of the ruler will also increase. Proving that the extension of the ruler does depend on the force of the weight. I will also expect the ruler to increase in length and be slightly out of shape after reaching its elastic limit.

We also carried out a preliminary experiment before the actual experiment. By doing this preliminary experiment we could achieve accurate and useful results in the near future. This experiment helped us decide how many times we should repeat the experiment to achieve accurate results. It also helped us decide where we should place the string on the ruler to get efficient results. The preliminary experiment also helped us make a decision on where how far off the table we should place our ruler to get efficient. The preliminary experiment also helped us decided whether we should have also changed the position of the weight and not just the force of the weight.

A RESULTS TABLE FOR THE CHANGES IN DEPRESSION WHEN THE FORCE OF THE WIEGHT IS CHANGED.

 WIEGHT ON RULER BEND OF RULER FROM NORMAL (CM) 1ST 2ND 3RD AVG 100g 15 15.1 15.1 15.07 200g 15.5 15.5 15.4 15.47 300g 16 15.8 15.6 15.87 400g 16.3 16.2 16.2 16.23 500g 16.6 16.6 16.5 16.57 600g 17 17 17.1 17.03 700g 17.5 17.4 17.4 17.43 800g 17.7 17.7 17.8 17.73 900g 18.1 17.9 18.1 18 1000g 18.4 18.5 18.5 18.5

All the results I gained were correct to 2 decimal places.

Conclusion

I think the results I gained from this experiment were sufficient enough for me to come to a formal conclusion. I predicted before the experiment that as the force of the weight increased, the depression of the ruler from the normal would have also increased.  This would prove that the extension of the ruler would really depend upon the force of the weight. I also made the prediction that the length of the ruler would increase and it would be slightly out of shape due to Hooke’s law. The prediction I made agreed with the Hooke’s law and my results from this experiment.

There were a number of anomalous results in my investigation. This might have occurred because:-

• Parallax error.
• Unavoidable certainties.
• Human error with the measurements.
• Hooke’s law.
• Beam quicker before we started.

I could have carried out some further work on this investigation to extend and broaden my results. I could have investigated different things such as rulers with different thickness, different material, I could have also changed the length of the overhead. I could have investigated how much weight would I have to put on to the ruler until it reached its elastic limit. I could have done another experiment using varying the same amount of weights and using the same objects but this time changing the position of the weight and linking them together. I could investigate if the results agree with my prediction and Hooke’s law.

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