The Youngs modulus of the copper wire Essay Example for Free

The Youngs modulus of the copper electrify EssayTherefore, having done the preliminary, I lithesomek that my predictions lie on the correct lines. It is best to employ a thin wire, beca economic consumption a thick wire would not stretch as much for the same(p) force, solo I have to consider safety, because the wire snaps and because it is under tension, it whips back and can cause some maltreat if the student falls in contact with it. Therefore, under these circumstances, it is necessary to wear safety goggles. If we atomic number 18 victimization a thick wire, you will find that we will be adding a large load. If the wire snaps, the same hazards would take place as mentioned above but, the weight dropping to the floor will cause alter to the toes etc, if the weight falls on the foot, so keep a safe distance as in brief as the extra load is added. DO NOT ADD THE WEIGHTS QUICKLY AS THE WIRE IS medium WHEN THERE IS ALREADY A LARGE FORCE APPLIED ON IT. The vernier scale i s sensitive, so we have to pay particular attention to how much force we apply, because the maximum extension, which can be read, depends on the size of the scale.Due to the augment in the average cross-sectional area, which affects the extension in the wire, we need to increase the accuracy of the educations by taking repeats, using different wire of the same diameter, and again take measurements of the diameter, with use of the micrometer. This increases the reliability of the results and hence the Youngs modulus of the copper wire. The vernier scale method is much more ideal than the clench and pulley method, which could have been used as well, but as we are aiming for accuracy it is best to use the vernier scale method.The experiment is to be conducted under room temperature, because the temperature of the wire whether shivery or earnest reduces the accuracy of the results, the wire stretches more under warm conditions because the wire is less stiff than if it was in col d or even room temperature of 23 oC. I will have to take account of contingent shifts, such as the zipper error in equipment, and former(a) random and systematic errors, which can occur. I will try to avoid making the parallax errors, (the error which occurs when the eye is not placed directly antagonist a scale when a reading is being taken).This can be made on reading off a ruler. The reading errors (the error due to the guess work involved in taking a reading from a scale when reading lies between the scale divisions, and the zero error (the error which occurs when a measuring instrument does not indicate zero when it should), which can be possible on the vernier scale. If the zero error happens, then I will adjust the instrument to read zero or the inaccurate zero reading should be taken and should be added or subtracted from any other reading taken. Sometimes the metre rules have worn edges and so I will measure from 10cm or else of 0cm.As the wire is stretched, the diamet er of the copper wire decreases, we get plastic contortion before it snaps, for exemplar if we look at a copper rod as a large scale to the thin wire you can see from the below that the copper rod necked before it broke. This happens because metals like copper, (above) are ductile- they can have large plastic deformations without fracturing. It happens because atoms move, as the plastic deformation in the crystal social structure move, to place of lower stress. The copper becomes thinner when atoms move away from the stressed part.The stress then increases because the cross-sectional area is now decreased. This increases the ductile flow and so the metal yields and gets thinner and thinner. Once plastic deformation starts, atoms will continue to flow without any increase in stress. This stretching under a unvarying load is called creep. The thinning of a wire/rod is called necking. There is also the problem that the kg mass may not weigh the given value, there is a small chance that this would be inaccurate, the only way to find out is by weighing the mass using a electronic scale, which is accurate to 0. 001g.BibliographyPhysics For You By Keith Johnson Dictionary of Science By C. Stockley Simmone Hewett C. Oxlade Sue Holt J. Weitheim John Miller Physics 1 By David Sang Keith Gibbs Robert Hutchings Science Desk Reference By Patricia barnes-Svarney www. s-cool. co. uk www. allmeasures. com Encarta 2002 AS Physics Assessed Practical (Skill P) Elasticity of a Copper wire By Priyesh Patel 12O 1 Show preview only The above preview is unformatted text edition This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.