• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

The aim of this investigation is to investigate the effect of adding varying weights to the end of a wooden ruler at different ruler lengths.

Extracts from this document...

Introduction

Physics Coursework: Ruler Investigation.

Introduction/Plan:

The aim of this investigation is to investigate the effect of adding varying weights to the end of a wooden ruler at different ruler lengths.

        I predict that as the weight increases on the ruler the more it will sag and the more it will sag each time, demonstrated by this rough graph:

image00.png

There should be a strong positive correlation between the sag and the force

I predict this because of the rule of compression and tension; as more force is exerted vertically onto the end of a ruler, the top face becomes tense and the bottom face becomes compressed. The explanation of this will be in my conclusion. I also make this prediction using the formula of moments:

Moment of a force (Nm) = force (N) x perpendicular distance from the pivot (m)

This will also be explained in my conclusion.

        (The diagram of my method is shown above next to my predicted graph shape). A wooden metre rule will be clamped onto a table using a G – clamp with a certain distance sticking out from the table. Another metre rule will be clamped with a retort stand at right angles to the floor so to measure the sag of the other ruler. The weights will be added to the ruler at three different lengths they will be added in one hundred gram amounts for each length (of the ruler)

...read more.

Middle

800

1000

Sag (cm)

0.0

4.5

9.0

11.0

13.0

19.5

        A graph showing these results:

image01.png

To conclude my plan; these results lead me to believe that there was a relationship between the sag of the ruler and the force added to the end of it worth investigating and these results formed the basis of my investigation.  

Results/Evidence:

The experiment was carried out and three sets of results were taken for each quantity of weight and an average was taken for each set of three results.

        The results are shown in the table on the following page:

This table can be summarised by these three graphs that show the average sag of the ruler at 90cm 70cm or 50cm against the force in Newton’s:

image02.png

It’s very evident that there is obviously a strong positive correlation between the sag (or depression) of the ruler used and the amount of force exerted on it. So therefore this experiment of mine will not have to be repeated because the relationship is as expected for all of these graphs.    

image03.png

Conclusion:

I conclude, generally, that there is a strong correlation between the sag and the force exerted on the ruler and that this point is helped proven by the line of best fit running through the points on my graph; they are straight and therefore indicate that the sag is directly proportional to force exerted on the ruler.

...read more.

Conclusion

        When carrying out this investigation certain difficulties were encountered: it was hard to set up the vertically mounted ruler for measurements and the sagging ruler at an accurate length, there was also difficulty in measuring the sag as the ruler with the weights on tended to oscillate up and down and therefore making the sag harder to read.

        If I were to repeat the experiment then I would change my method slightly; I think I would use a steel ruler as well as the wooden one and take readings using a spirit level so to increase the accuracy of my investigation for reasons already explained.

        To make the investigation more accurate and to obtain more evidence I would have to have collected more data for all the different lengths. This would make me surer of my conclusion as it would show that my conclusion can be more widely applied.                  

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Mechanics & Radioactivity section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Mechanics & Radioactivity essays

  1. Investigating the factors affecting tensile strength of human hair.

    The amount of melanin and its distribution determine how dark or light the hair colour will be.

  2. The factors affecting the deflection of a cantilever when weights are added onto the ...

    A G-Clamp + small block of wood 3. A Hook 4. 7, 1 Newton weights 5. A small coil of string First fit this equipment up like so: The string is used to attach the hook to the ruler.

  1. Science 1 Investigating thedeflection of a cantilever.

    1g weights. We find that with increase in force in Newton's there is a similar increase in the deflection of the ruler in approximately 0.8cm/g of weight. These results are as expected. The graph shows a straight line and there is ~0.8 cm increase in deflection.

  2. The Spinners Investigation.

    The Method The detailed plan is: To carry out this investigation you would have to do the following: First, you would have to make the spinner, you can make it however you want but there is a spinner for example overleaf. Add a paperclip to give it a little weight.

  1. Perform an experiment on friction and the variables of friction using a wooden block, ...

    To test the affect of surface texture on friction, I will, Place the block on the surface with a Newton meter tied to it, the meter will then be pulled and as soon as the block shows signs of movement I will record the amount of Newtons needed.

  2. Helicopter Investigation

    It is always essential to make every investigation of whatever type it is to make sure that it is going to be a fair test. In order to achieve this I shall only be changing one variable, which I have already established to be of the number of paperclips added to the tail of the paper helicopter.

  1. OCR B Advancing Physics Physics Practical Investigation Coursework Investigating Simple Harmonic Oscillations

    As mentioned before, an uncontrolled variable in mass surface area could add to this effect, the larger the mass, the greater the surface area for loss of energy through friction. It was planned to further the investigation with a more viscous damping fluid, but the large effect of water damping (water being a particularly non-viscous liquid)

  2. The aim of this experiment is to investigate the patterns of circular motion using ...

    Fishing Wire 5. Plastic Tube 6. Timer 7. Crocodile Clips. Diagram: Results from Preliminary Work From the experiment I can say that I am going to investigate measuring different size radii. Here are my results. Radius/cm Time taken to complete 20 revolutions / secs 100 11 125 8 150 7 175 6 200 6 225 5 I repeated the experiment to get accurate results.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work