'Joules law Essay\r'

'Variables and incessants The atomic number 53 variable in this sample get out be the freight fit(p) upon the outfit, this is the obvious variable because as run inton in the formula. By rearranging the formula to; e = F L A E We bunghole see that there argon 3 main factors which will effect the final result of the test. The E symbolizes Young’s modulus, which will be effected by changes but is not itself a single factor as it is a bill of the factors. In order for the experiment to be a success, it has to be a fair test.\r\n olibanum of bank line meaning that factors that need to be kept constant must(prenominal) be identified and kept that way. In this scenario I will be isolating armament as my variable. great power is directly related to the demoralize on the equip; whole multiplied by the gravitational pull (approx. 9. 81) as the load is deliberate in Kg as it is a push-down stack. From the compare we can see that a change in Force will indeed affe ct the backstage service of the fit out, at this stage it is apparent to swan that; theoretically the larger the force the greater the extension harmonise to the equation above, as it is the value that is world divided.\r\n followers this it is also imperative that both the Cross sectioned area of the wire is indeed accurately measured, as considerably as remaining constant finished aside the experiment, as a change in this value would indeed effect the value for flexible sample, and in let go the extension. The continuance of the wire must also remain consistent through with(predicate) out the experiment. This is because for each one unit of wire will put out or e retentiveate by a relative amount to the load universe applied to it. Thus ever-changing the length of will increase or decrease the amount of units of wire that can be stretched, causing different readings to be measured.\r\nThe wire will indeed elongate and extend no return what the length, but for t hese experimental purposes it is best to be long as explained above to stand a greater chance of criterion it properly. The important thing is to stiff the length of wire you wish to work with and do not change it.\r\nB) Implementing Results, posters and description. Cross sectional diam of wire Measurement number and degrees of rotation 1/mm 2/mm 3/mm Average 0 Calculation of Average wire diameter= (0. 195 + 0. 185 + 0. 1925) / 3 = 0. 1908mm Thus the average insure sectional area of the wire is Force = mass 9. 81 ms.\r\nTable of readings Final length, attempt; chaw/g Mass/Kg Force/N Orig. L/M 1/M 2/M 3/M Mean elongation/ Unfortunately computer misconducts can easily occur in this experiment, the first way of minimizing the percentage fault in the experiment is to identify the seeded players that could cause such a problem; these being. When bar the extension there are 3 main sources of uncertainty.\r\nMeter rul Parallax error home in error I plan to minimize these by * Careful choice of meter rule, as reality are bent and warped Fixing a head and eye position against something so that the parallax error is minimized as I will be looking at the pattern from exactly the same(p) angle. Record results from 0. 0 M If there is a zero error, take it away from the results. When measuring the burden of the mass the following sources could effect the results; Zero error on the scales Not allowing for the metric weight unit of the cradle\r\n just now using the weight that is imprinted on the mass instead of weighting it. I will minimize these sources by selecting my masses carefully and weighing each one apiece to find its exact weight, as sound as double checking a pair of scales against each other by putting the same weight on both scales to see if there is a zero error. The final measurement source of error is the measurement of the diameter of the wire. This is typically a source of inaccuracy because the wire does vary in cross sectional are a, because of the way it was made.\r\nThis can be accommodated for by measuring the wire extremely accurately with the micrometer caliper, and measuring the wire in three different areas of the length and taking two readings at each of the three slurs on the wire, twisting it 90 degrees at each dismantle to allow for ovals etc. The average can thence be taken and used in the calculations to travel by a better representation of the wire being used Diagram of ideal and misshapen wire. Observations for experiment conducted on the 14th of December 2002 At near 0930 the equipment was set up and the working area was in suitable condition to go ahead with the experiment as planned.\r\nI had two main concerns whilst conducting the experiments, these were of measuring natures, the first of these being that, when measuring the wire with the micrometer it proved initially extremely hard to turn the wire 90 degrees, I quickly remedied this by sticking a label on the wire so that it was clear what angle the wire had to be turned. The second was that of concerning minimization of the parallax error, this proved to be preferably challenging, so we decided to look at the ruler twice each a couple of seconds unconnected and in what i8 thought was the same position to see if it was a fair test.\r\nThis way through up different results so we deemed it necessary to have somebody stand over the wire and not expunge until the experiment was finished to minimize this risk. Another observation I made was that I didn’t appreciate we were measuring the extension accurately enough I felt that measuring it to 1mm was far to inaccurate as the extension as will be seen by the graphs was minimal, I will mention this point intemperately in the Evaluating. The equipment was packed away and the experiment was completed within the hour. I observed a changing in mass or load on the wire and no change in any(prenominal) of the identified variables.\r\nC Analyzing Evidence and Drawing Conclusions. Force/N Area/M Sress/Nm (Pa) duration/M Extension/M Strain Youngs modulus 1 The stress was simple to calculate as it just now meant dividing the force by the area, as so; The turn is a simple ratio it involves dividing theextension by the length; Thus the young’s modulus can be found for every plotted point separately on the graph; this is done by dividing the stress by the strain.\r\nAs I predicted earlier the satisfying obeys hookes law and froms a straight line through the origin until the elastic limit is reached. As well as we can calculate the extension from the slope of the graph because its equal to L / EA. When a square obeys Hooke’s law, then its force, extension graph is a straight line through the origin (see graph). This is but the case up to the proportional limit. The graph being a graph of force against extension, the area is the sinew stored in the wire. As the equation of the graph is F=kx, the equation of the area is . \r\nFrom the graph we can say that as the load increases on the wire the extension also increases proportionally, up to a certain point known as the elastic limit, this is because it is obeying kooks law as described above, and for this material whilst under low load the strain is proportional to the stress.. Show preview only The above preview is unformatted text This student create verbally piece of work is one of many that can be found in our GCSE Electricity and magnetism section.\r\n'