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

Investigate the relationship between pulling back an elastic band and how much force it exerts.

Extracts from this document...

Introduction

Simon Beard 11Y

Investigating forces

Plan:

        I am going to investigate the relationship between pulling back an elastic band and how much force it exerts.

Equipment:

I am going to need:

  • An elastic band
  • A margarine tub
  • A 100g weight
  • A stool
  • A table
  • A Newton meter

Diagrams:

Fair test:

        The factors that could affect my experiment are the stool, the elastic band, the margarine tub, the weight and the desk.

I will make sure the stool is the same as some stools may have been made a different size or may have been bent out of shape. Both of these factors could add more tension to the elastic band or could make it slacker, these would affect my experiment as the amount of strain potential energy would be different.

I will use the same elastic band as different elastic bands would have different elasticity. This would affect my experiment, as if you pulled an elastic band back 10cm, it would have more strain potential energy then a slacker elastic band pulled back 10cm.

I will use the same margarine tub throughout the experiment as a different tub might be a different weight and a different size. This would affect my experiment because the heavier the tub, the less distance it would travel. Also, if the tub rotates while moving, I will do that test again.

...read more.

Middle

Distance =         the distance elastic band is pulled back or the distance the tub travels

For example:

Elastic band:                Work        =        force                x        distance

                        Work        =        2N                x        7cm

                        Work        =        2N                x        0.07m

                        Work        =        0.14J

Margarine tub:        0.14J        =        1N (100g)        x        d (distance)

                        d         =        0.14J                /        1N (100g)

                        d        =        0.14m

                        d        =        14cm

Here is my table of predictions:

Force transferred to tub (N)

Distance elastic band pulled back (cm)

Predicted distance of travel (cm)

2

7

14

3

11

33

4

15

60

5

18

90

6

21.3

127.8

Here is a graph of my table of predictions:

image03.png

This graph contradicts the one I drew earlier as this one obviously curves. If my prediction of Force  Distance is correct, this graph should be a straight line. However, looking at my prediction table I have noticed that the distance travelled by the margarine tub is proportional to the product of the force applied to the elastic band and the distance elastic band is pulled back. I know that the product of the force applied to the elastic band and the distance the elastic band is pulled back is the amount of energy stored in the elastic band.

...read more.

Conclusion

The second half of my prediction is correct and I successfully managed to explain what would happen using my knowledge of forces and some formulas.

Evaluation:

        I think my experiment went extremely well as everything went to plan and I believe that my results were fairly reliable and quite accurate. I managed to notice that I had two anomalous results

The method worked well because the experiment was completed quickly and smoothly. It produced reliable and accurate results all round apart from two which I believe to be down to be human error.

I have circled the anomalous results on my graphs. As all my other results seem to be so close to my line I can only put this down to human error.

Here are some ways in which I could have improved the experiment:

  • Instead of using a mechanical Newton meter I could have used a more reliable electronic one.
  • Instead of using a meter ruler by the side of the stool, I could have had the measurements drawn or printed on the tabled or on a long sheet of paper laid underneath the stool and where the tub is going to go. This would have improved my measurements as I would not have lost accuracy using the ruler and the set square.

If I was to do this experiment again I would take more measurements to put further backing behind my prediction. I would take measurements from 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5 and 6N. I would also involve the two improvements stated above.

...read more.

This student written piece of work is one of many that can be found in our GCSE Forces and Motion 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 GCSE Forces and Motion essays

  1. Margarine Tub

    As the kinetic energy is a constant, the line of best fit is not a straight line because of the velocity squared part of the formula; this will vary the gradient of the line of best fit. The gradient changes because you are not multiplying the velocity by a constant,

  2. Potential energy in an elastic band that is transformed into kinetic energy and the ...

    Force Applied (N) Length when stretched (cm) Distance flown (cm) Average Braking Distance (cm) Average 1 2 3 1 2 3 1.0 4.9 11.6 11.7 11.3 11.5 1.6 1.7 1.4 1.57 2.0 7.6 12.9 12.9 13.1 13.0 2.4 2.6 2.6 2.53 3.0 11.2 26.3 27.2 26.8 26.8 3.9 3.8 3.9 3.87 4.0 17.8 39.6 42.1 59.9 47.2

  1. Mechanical Properties of a Meter Rule

    I will only change one variable at a time. I shall do this by setting up an experiment as seen on the apparatus diagram 1. First I will attach the clamp to the stand and then the wooden meter rule.

  2. This project involves testing a catapult by using a rubber band to catapult a ...

    Place mass against centre of elastic band and make sure it isn't twisted. 4. Pull back mass so that edge is at 1cm and release it so that it travels down the centre of the track. 5. Measure the length that the mass has travelled using the 1m ruler.

  1. To see how the distance, a weighted margarine tub travels, changes as the distance ...

    Although this doesn't control the things very well, it is the best that can be done in the classroom. Prediction I expect that as the distance the tub is pulled back increases, the further the box will go when propelled forward.

  2. My aim is to find out whether mass affects the distance travelled by a ...

    I think that to make the experiment better and make the results more reliable, I could have performed the same experiment more times (maybe 5 or 6) this would have given me a larger range of results and therefore a better view of the actual values and distances.

  1. Approximate Stopping Distances

    The braking distance will also be affected and will depend on the following: * The condition of the brakes * How good the brakes are * How well the tyres grip onto the road, this can depend on the weather * The road surface * The condition of the car

  2. Controlled Assesment Experiment - The extension of a rubber band depends on the force ...

    This means that when a force is applied to deform the shape, it stays deformed when the force is removed. We use Hooke's Law in spring balances, kitchen scales and Other devices where we measure using a spring. A force applied to an elastic object, such as a spring, will result in the object stretching and storing elastic potential energy.

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