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

Investigate the way in which extension depends on the tension for rubber.

Extracts from this document...

Introduction

Brendan Lee Tension and Extension Aim: To investigate the way in which extension depends on the tension for rubber. Before I begin to do this experiment I need to know a little more about elastics. I got my self an elastic band and placed it over my forefinger on each hand. I gradually increased the tension of which I was applying. The original length of the elastic band was 3 cm, but when stretched to its furthest length, it had a length of 21 cm. This meant that it had an extension of 18 cm. The band could not stretch any further than this. If I had exerted even more tension the band would have snapped. I also noticed that after being stretched a few times, and then compared to an exact sized band that had not been stretched, that it did not return to its original shape. It had increased in size by a small amount. However if I only stretched the band a little bit each time, it would return to its original size. When tension is applied to the elastic band, the band automatically begins to repel that force that is stretching it, and when released the band moves back to its original position. When the band is stretched something is pulling the band in the opposite direction, a force. Now the band is stretched it has the potential to do work. ...read more.

Middle

Weight (g) Length of band (cm) 10 20 30 40 50 60 70 (It would be suggested to collect as many readings as possible with the time available. Between 500-1000 should be sufficient) This table should be filled in throughout the experiment. When each weight is on the elastic band, note down in the corresponding column the length of the elastic band. Safety: When placing the weights onto the elastic band, the main stand may become unstable due to the weights, so in order to avoid hurting one's self use a clamp to fasten the stand to the table. The only other safety issue that needs to be addressed is if the elastic band snaps, the weights will fall. To avoid any injury or damage one should place something underneath the weights to catch them when they fall, a tray, or box would be sufficient. Hypothesis: I think that the elastic band will increase in length, but not at a constant rate. I think this because when experimenting with my elastic band there came a point where the band would stretch no further, even with additional force, until it broke after a strong pull. And when pulling the band, I felt that the it stretched a lot without a great deal of force having been applied. So I feel that the extension of the elastic band will not be proportional to the load, proving that Hooke's law does not apply for elastic bands. ...read more.

Conclusion

If a graph is curved it means that the x-axis and the y-axis are not proportional to each other. I.e. x does not equal y. Therefore I have proved that an elastic band does not obey Hooke's Law, as stated in my Hypothesis. Also in my hypothesis I mentioned that little force is required to stretch the elastic band up to a certain point. This theory is proved by my graph, as at the origin there is an irregularity about the curve. This change in shape is where the elastic band needs little effort for it to extend. So my other prediction in my Hypothesis is correct. Evaluation: The main problem that I came across was measuring the length of the elastic band. It is difficult to accurately measure the length as the elastic band moves as it is hanging from the stand, and so trying to find the very top and bottom of it is difficult. To overcome this it might be helpful to have a set square attached to the ruler which sticks out so that it was flat on the bottom of the elastic band, and showed the measurement on the ruler. I would have liked to have done the experiment with different sized elastic bands, in order to find out whether the thickness effects the relationship between the load and the extension. More time was needed, as I would have liked to have collected more data than what I had in order to see whether the extension increased just before breaking. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Waves & Cosmology 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 Waves & Cosmology essays

  1. Does a rubber band obey Hooke's law?

    band does not obey Hooke's law because the atoms in rubber are all squashed together, so when a rubber band is pulled the molecules start to unfold and therefore making the rubber band longer. The rubber band will stretch the most at the start because the molecules will be easily unfolded...."

  2. Determine the value of 'g', where 'g' is the acceleration due to gravity.

    I have got an error in my value of effective mass, which I have calculated below: Maximum error = 0.049-0.020 = 0.029 Minimum error = 0.005-0.020 = -0.015 This means that the value of effective mass could be +0.029 and -0.015 of the original value.

  1. To investigate the relationship between the extension and the force added, whether they are ...

    Original Length (mm) New Length (mm) Extension (mm) +/- 00 60 60 mm 0 mm +15 50 60 75 mm 15 mm +15 100 60 90 mm 30 mm +15 150 60 105 mm 45 mm +15 200 60 120 mm 60 mm +15 250 60 135 mm 75 mm +15

  2. Stretching Springs/Hookes Law.

    The forces of attraction/bonds between the particles stretches because when it stretches it makes the particles separate, so it then after the weights have been removed go back to normal because they are attracted to each other only if the weights that are put on do not make the spring

  1. An experiment to investigate and determine how rubber behaves when tension forces are applied ...

    Under these conditions the object returns to its original shape and size upon removal of the load." Elastic behaviour, according to Hooke's Law, is when there are displacements in the molecules of the rubber sample being used, are moved from their normal positions, which means they are proportional to the force that causes the displacement.

  2. Investigation to show how Elastic Bands Behave Under Load.

    10.3 300 26.2 18.0 400 32.1 23.9 500 34.3 26.1 600 38.2 30.0 700 41.2 33.0 800 43.0 34.8 900 44.9 36.7 1000 45.9 37.7 We repeated our results on this band. Load/g Length/cm Extension/cm 0 8.4 0 100 13.1 4.7 200 21.9 13.5 300 31.5 23.1 400 41.1 32.7

  1. Investigation in the extension of an elastic band

    Results Mass kg Loading Measurement m Loading - 0.044 m Unloading Measurement m Unloading -0.044 m 0 0.044 0 0.052 0.008 0.1 0.052 0.008 0.082 0.038 0.2 0.074 0.030 0.127 0.083 0.3 0.098 0.054 0.174 0.135 0.4 0.125 0.081 0.223 0.179 0.5 0.149 0.105 0.231 0.187 0.6 0.170 0.126 0.250

  2. I intend to investigate whether any correlation exists between the wavelength of light exerted ...

    Arduino 16Mhz Microcontroller * 5v Relay * Small Solar cell * 9v Red LED * 9v Green LED * 9v Purple LED * 12v Variable DC power supply * Laptop * Pasco GLX Data Logger * Pasco GLX Light Sensor * Digital Multimeter Calibration: Relay I was limited in terms of LED driving power by the microcontroller.

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