An Experiment on the Friction Coefficient of Different Materials on an Inclined Steel Plane

The Congress authorized the amount of copper in a penny after 1982 to be 2.5% by mass. The mean value found from this lab was 3.018%. There were no discernable variations based off of the penny’s apperance or mint date. The value reached from this lab is significantly different from the authorized copper content.

* Copper, gold and aluminum are all alloyed with other metals to make them harder.

The reason for the difference in numbers might have been when the copper’s were weighed on the scale. If the scale was not at exactly zero before placing the copper, the results would not be 100% accurate.

Overall, the 1018 and 1045 steel specimens displayed similar relationships between the heat-treating procedures. The 1045 steel had a greater tensile strength in all states except for the quenched state. In general, the 1018 steel specimens were more ductile than the 1045 steel specimens in all states.

A spectrophotometer helps to determine absorbances of the samples that you have. The average amount of copper in the brass sample we got was 57.7%. This value is on the higher side being over 50%. I believe that brass is mainly made of copper so the higher value is a good thing. Our curve that we got for our graph is very linear.

I utilized the coefficient of friction values based on skid testing conducted by the Institute of Police Technology and Management, (IPTM). IPTM testing, indicates a coefficient of friction of .90 - 1.50 for a vehicle furrowing.

Friction is an opposing force. It acts in the opposite direction of the marble or the roller coaster cart. When designing a roller coaster you want to have as little friction as possible. This goes the same way with my model track, i want to make sure the track is designed to where friction will not be a worry factor but i want there to be enough of it to keep the marble from going to fast and running off the track. The force of gravity will help take some of the pressure off the importance of friction but with the marble being so light i am more than likely going to apply more friction only because the weight of the marble is so light. If the laws are correct i should have a successful marble

10 materials were chosen of various types from wood and metal to polymers in order to make sure that a material was not overlooked.

The surface coating field is a rapidly developing area of science and technology that offers new methods and techniques to control friction and wear. New coating types are continually being developed and the potential applications in different industries are ever growing, ranging from machine parts and consumer products to medical instruments and prostheses. stainless steel fades when exposed to the environment. Modern technology increasing stresses on the material. Both the uses and the stresses have grown at a maximum rate than the number of materials that can be used to meet them. Although lot of work is done by producing new alloys with improved properties, there is a limit to the protection that can be afforded by this means alone. For this reason coatings have played an important role in protecting the structural metals from environmental attack.

From the calculations, the average coefficient of friction on dry road was 0.705 and the average frictional force was 8016.27 N. The average coefficient of friction on wet road was 0.553 and the average frictional force was 6299.6 N. As stated before, a patterned tire gives typical dry and wet frictional coefficients of about 0.7 and 0.4, respectively (Jones, 2001).

Steel products were defined by several attributes which determined the product application and defined quality. Grade described the metallic (chemical) composition of the steel, or the elements added to the basic recipe of iron and carbon to create the desired properties. Product described the shape of the product, including semi-finished shapes (blooms, billets and bars) and finished shapes (wires and coils). Surface finish described the smoothness and polish that could be applied to the material’s surface to enhance presentation. Size described the latitudinal and longitudinal dimensions of the product. Structural quality described the absence of breaks in the inner metallic structure. Surface quality described the absence of cracks or seams on the surface. Because specific applications called for specific attributes, many products were customized along one or more attributes for the customer. However, of all attributes, customers valued most the grade, which determined product performance.

The aim of the experiment is to examine how the acceleration of the car differs when the angle of inclination of the ramp is amplified and to record and analyse findings.

Overall, the experiment succeeded that the metals show the theoretical properties. Differences existed in the mathematical calculation of the actual length. These differences, however, it can be accounted for by experimental error; more over there are uncertainty on purity of the

“And this also,'' said Marlow suddenly, ``has been one of the dark places of the Earth.'' (Conrad) Are the first words spoken allowed by Marlow in Joseph Conrad’s Heart of Darkness. Marlow goes on the say that he was thinking about the Roman conquers who came to England 1900 years ago. This comparison that Marlow divulges into in the beginnings of his story frames this story and what it intends to cover in its subject matter. Marlow begins here his only overt characterization of imperialism. He puts Rome in the position of the civilized and the native islanders in the position of the savage and what truly distinguishes one from another is not any level of civility but power. Marlow claims that “It was just robbery with violence, aggravated

Many people suffer from ‘test anxiety’ even the most confident people can get a little stressed out about test. I do suffer from test anxiety, just the thought of a test can send chills down my spin. There are times when I can just look at a test and want to throw up. But why is my anxiety so bad with test? Well, with me there are many things that cause it but here are a few: whether or not I studied, how many questions there are in a short time period, and even the teachers can cause the stress.