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# Whether forces or weights applied to a bridge cause a depression to the surface of the bridge.

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Introduction

Investigation I want to find out whether forces or weights applied to a bridge cause a depression to the surface of the bridge. As well as the weight applied to the bridge there are other variables that can affect the depression of the bridge. These variables are: 1. Distance of the bridge from the pivotal point of the bridge of the bridge (50cm mark) and each other 2. The width of the bridge. 3. The length of the bridge. 4. The material the bridge is made from. For the purposes of a Fair Test all of the variables except the weight being applied, which is the independent variable, must be kept constant as dependant variables so that they cannot affect the results in the changing of the depression. The weights cause the depression on the bridge because they add extra downwards forces. ...read more.

Middle

A knowledge of Parallax Error should be had in the interest of accuracy. Parallax Error is when reading a measurement you look above or below the actual mark and get a wrong reading. This can be avoided by taking the reading at eye-level. Apparatus and Diagram The apparatus I intend to us is: 1. Two identical wood blocks to simulate the bridge supports. 2. Metre ruler to simulate the bridge. 3. Two identical triangles to sit on the blocks for the ruler to rest on. 4. Weights ranging from .5N to 3N to hang from the bridge. 5. Pin attached to the ruler to help read the depression. 6. Another ruler with which to measure the depression. 7. String to tie around the ruler on which the weights are suspended. Methodology The experiment is carried out by 1. ...read more.

Conclusion

In the interest of accuracy I will repeat the results and from the two sets of results I will make an average. Predictions I predict that the results will show that the greater the weight added the greater the depression will be and so the depression in the bridge is directly proportional to the weight added. Presentation of Results The results of the experiment would have in a table to be shown as follows: Mass/ Weight (Grammes/ Newtons) Initial Dep. (Mm) Dep. (Mm) Dep. -Initial Dep. (Mm) 2nd Initial Dep. (Mm) 2nd Dep. (Mm) 2nd Dep. -Initial Dep. (Mm) Average Initial Dep. (Mm) Av. Dep. (Mm) Av. Dep.- Initial Dep. (Mm) 0g/0N 50g/0.5N 100g/1N 200g/2N 300g/3N There are tables showing 2nd and average headings for the interest of accuracy, the readings were taken a second time for each weight and then the average was worked out. A graph of the results would be as follows: ...read more.

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