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# Experiment on Hookes law using bridges

Extracts from this document...

Introduction

### Experiment on Hookes law using bridges

Physics Coursework:-

Bridges.

Plan.

Aim: -

The aim of this experiment is to find out the amount of sag a bridge of different lengths can cause when under different kinds of tension and mass.

Apparatus: -

To carry out this experiment we will need the following apparatus -

Weights (In different proportions)

A measuring apparatus (Ruler)

1 metre of wood

Two wooden blocks.

Method: -

We will assemble the apparatus together and set the pieces up as shown in fig.1. The two wooden blocks shall act as the supports and the material will be the main beam linking the two blocks.

We shall place the material across the blocks. We shall measure the length from the bottom of the beam and floor using a ruler (in centimetres). We shall have the length of the actual bridge at 90 cm, then 70cm and 50cm (fig2) if so we shall use the measurements in between the stated for further knowledge. We shall place different amounts of weights onto the centre of the bridge so we can measure the maximum sag it causes. The weights shall increase at 50g intervals or at 0.5N until we reach to 500 kg or 50N (Mass = 10 / Weight on Earth).

Middle

&Oslash; The Equipment -

The equipment that we shall be using will be checked to see if there is anything wrong with it, for example the main beam already has a sleight bend within it or if the blocks are uneven. We shall a bottle full of water to check if the floor is even etc. We will have to use the most accurate equipment available to us so we can obtain the best possible results.        The material that we are using as the main beam we be one metre in length otherwise the sag we not be the same proportion and will also be a regular shape (length, height, width) or again the sag will not be proportion to each other. The materials will have an equal variable 1.5 cm overlap on both sides on the blocks to stabilise the beam. Planning Help: -

My plan is a sophisticated plan because it has a lot of controlled factors and variables that are suited if anything in the plan goes wrong. The different materials will give us a good understanding in the different amount of tension is caused when the materials

Conclusion

Hooke's Value = Mass

Extension

In the graph and the tables that have been drawn the value is equal for each of the weights and this shows that the proportion between the weight and the extension is correct.

Evaluation: -

The experiment worked out to produce good and accurate results so we could plot a graph and draw a sensible conclusion.           The results obtained were accurate enough but the was a few amorous results obtained when experimenting the span of 60cm this is most likely due to the fact that the measurement that was required was too small to be measured by a standard ruler of 15cm.

70cm span - The sag increases by 0.1cm every 100kg        60cm span - The sag increases by 0.1 or 0.05cm every 100kg

50cm span - The sag increases by 0.05cm every 100kg

As we can observe here the sag is decreasing at a steady amount but when we reach 60cm the progress is stopped so the increase of the sag could be 0.75cm and we need an instrument capable of going into minute measurements or it could be that the measurements taken at the time were not taken properly and thus need to be retaken.

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