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

Measuring Young modulus of copper

Extracts from this document...

Introduction

Physics TAS Full Report

D1:Measuring Young modulus of copper

                                                        19-10-2006

Aim

-To show that solid matter (copper wire) obeys Young modulus by finding the relationship between the load which is loaded at the end of the wire and extension of the copper wire.

-To show that solid matter (copper wire) obeys Hooke’s law in elastic deformation condition.

Apparatus

Copper wire

Slotted mass with hanger (0.1kg each)

G-clamp

Adhesive label

Wooden blocks

Micrometer screw gauge

Half-meter ruler

Safety goggles

Pulley on clamp

Procedure

  1. A micrometer screw gauge is used to measure the diameter d of the wire at 2 or 3 different points along its length and is taken the mean value.
    image00.png
  2. The apparatus is set up on the bench as shown above. Be fixed an adhesive label on the wire as a marker.
  3. Original length l of the wire
...read more.

Middle

0.7000

Failure

0.0060

0.0070

0.8000

Failure

0.0070

0.0090

0.9000

Failure

0.0145

0.0130

1.0000

Failure

0.0220

0.0320

1.1000

Failure

0.0430

0.0530

1.2000

Failure

0.0785

0.0795

1.3000

Failure

0.1190

0.1270

1.4000

Failure

0.1720

0.1650

4. Graphs of load against extension

-1st measurement (failure)


-2nd measurement*

image01.png

-3rd measurement*

image02.png * The red points are the centroids of slope of straight line


5.  Estimation of the elastic limit from the graphs

  %strain = (extension/original length) x 100%

1st measurement

2nd measurement

3rd measurement

%strain

Failure

6.5152

4.3732

  1. Measurement of slope of the graphs

Slope of graph = load/extension

1st measurement

2nd measurement

3rd measurement

Slope of graph (+0.0996kgm-1)

Failure

114.2857

100

  1. Young’s modulus of copper calculation

E = slope of graph x (4gl/πd2)    where g=10ms-1

1st

...read more.

Conclusion

(VI)

There was a small space in the pulley that the wire which was measured the

extension may not been in straight.

Conclusion

The 1st measurement is failure because the length of the wire is measured after the hanger is loaded at the end of the wire. Therefore, the experiment result is not accurate because the length of the wire is included the extension with the hanger.

The 2nd and 3rd measurements are proved that copper wire obeys Young modulus and Hooke’s law in elastic deformation condition. The stress (or the load) of the wire was directly proportional to the strain (or the extension) of the wire in elastic deformation. The deformation is remained elastic when the wire is loaded 0.8kg (elastic limit) of slotted masses in the graph shown. The yield point was the wire which is loaded 0.9kg slotted masses. The breaking stress of the copper wire was 1.4kg in both measurements.

...read more.

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

  1. Peer reviewed

    Investigating the forces acting on a trolley on a ramp

    5 star(s)

    Conclusion and evaluation From the results, it was possible to draw 3 values for g; one for each angle of O. With the largest sources of error considered, it was possible to add a percentage uncertainty value to each of these results.

  2. Young Modulus of Copper

    mass and the extension within this elastic limit to find the Young modulus . Young modulus (E) = = = = = = () () = S Procedures : Part 1 1. Set up the apparatus on the bench top as shown in figure a .

  1. How can I work out the Young's Modulus of copper wire?

    graph look completely different, meaning that an accurate Young's Modulus cannot be determined. To fix this, the loop was strengthened by being doubled over upon itself, and not being twisted as much, as the twisting would also weaken the wire.

  2. Measurement of Young modulus of iron

    Elastic limit = 10 x10 /1.0568 x 10-6 = 9.462243941 x 107 Pa Elastic limit = (10 + 0.9352) x10 /cross-section area = 1.0347 x 108 Pa 4. State the sources of error and suggest improvements for this experiment. * Reference wire should be used to compensate for the temperature variation during the experiment.

  1. Practice A2 Investigation: Measuring the torsion of wire

    The equipment required for this experiment is as follows: * Retort stand * Selection of wires of different length & thickness * Torsion Bar * Stopwatch * Ruler * Micrometer * Scales (for measuring mass of torsion bar) Underlying Physics Whilst one may think that there would be variation in

  2. Quality of Measurement - Physics AS

    set up of the circuit will be very simple too the ticker timer will be placed on a clamp attached to a retort stand and the ticker timer will have a weight attacked to a 5cm strip of paper and the ticket timer will punch holes in the paper every

  1. Elastictvy of Copper investigation

    and e is the extension. Based on Hooke's law theory I predict the greater the value of K is the Stiffer the spring will become. Also for the graph of F against e, the line should be completely straight. The gradient of the straight line from the graph when drawn will be equal to K.

  2. Lab Report - In this lab report, it will describe the weight of the ...

    By relying on human reflexes will result in inaccurate and inconsistent start and finishes. The timing method was not sufficient for this experiment. Having a timing method more suitable of this experiment would produce an accurate timing result. Lab 3 Part 3 - To determine how the length of string affect the period of a pendulum.

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