Friction and the Variables of Friction Using a Wooden Block Essay Example for Free

Friction and the Variables of Friction Using a Wooden Block Essay I am going to perform an experiment on friction and the variables of friction using a wooden block, a piece of string and a Newton meter. I will test 3 variables: weight, surface area and surface texture. Each test will be repeated 5 times to get a fair range of results. Friction is the force of two objects rubbing together and slowing and/or stopping each other. The amount of friction produced depends on the appearance of its surface for example: The surface of the sandpaper has deep slopes and the surface of the paper has to move up and down those slopes to proceed, causing friction. My first test will be done to measure the affect of weight on the amount of friction between the block and the table top. The block ill be placed on the table and the Newton meter tied to it. Then the Newton meter will be pulled until the block starts to move and as soon as it does the amount of Newtons required to cause that movement will be recorded. This will be done 5 times then averaged. To make sure it is a fair test I will: use the same Newton meter and the same wooden block to avoid introducing other variables; I will also use the same section of table using the same side of the block every time. I will be vigilant of how I pull the Newton meter, the moving force should be parallel to the supporting surface because pulling it up will lessen friction and pulling it down will increase friction. I predict that as the weight on the block increases so therefore does the down force, increasing the amount of friction because it becomes more difficult for the ridges to pass over each and so a block with less/smoother ridges would find its passage a lot easier. When the experiment was carried out, as I predicted, when the weight on the block increased so therefore did the Newtons required to move it from a fixed position. The test was done with 2 Newton meters over 2 days. Using the same Newton meter was impossible as it broke. My results were as follows: Weight of block = 2.0N Weight T1(N) T2(N) T3(N) T4(N) T5(N) Average(N) Block 1.2 0.8 1 1 1 1 Block + 1N 1.6 1.5 1.5 1.8 2 1.7 Block + 2N 1.8 1.8 2.5 2.4 2.5 2.2 Block + 3N 2.2 2 3 3.2 3.3 2.7 Block + 4N 2.6 2.6 3.8 3.5 3.5 3.2 Block + 5N 2.8 3.5 4 3.5 3.6 3.5 In the first experiment weight was tested and a set of results produced. In this second experiment the surface area in contact with the desk will be tested. To obtain my results I will use the following method, the block will be placed on two sheets of paper a measured distance apart with a Newton meter tied to it. The block will then be pulled and as it begins to move the amount of Newtons required to cause this will be recorded. Each test will be done 5 times then averaged. To make sure it is a fair test I will; as the same Newton meter ensuring non-introduction of new variables, use the same side of the block, use the same two pieces of paper and make sure the blocks movement is parallel to the supporting surface. I predict that as the surface area of the block exposed to the desk increases so will the amount of Newtons required to move it because there will be more sharper ridges to pass over therefore requiring more Newtons. My results were as follows: Exp mm2 T(n) T2(n) T3(n) T4(n) T5(n) Avg(N) 11.3 0.5 0.9 1.1 1.2 0.7 0.88 22.6 0.6 0.6 1.1 0.7 0.6 0.92.72 33.9 1.2 1.1 1.1 1.1 0.9 1.08 45.2 1.1 1.1 1.1 0.9 1.1 1.06 56.5 1.1 1 0.9 0.7 0.6 0.86 68.1 1.1 1.1 0.9 1.1 0.6 0.96 My prediction on 1 or 2 of the results was correct or partially correct but on the whole I fear my prediction was incorrect as it seems the surface area (exposed to the desk) does not greatly affect the amount of Newtons that is required to move it, any affect it does have is not continual and seemingly erratic. The friction experiment has now been done with 2 variables: weight and surface area. I have now come to the third and final, surface texture. To test the affect of surface texture on friction, I will, Place the block on the surface with a Newton meter tied to it, the meter will then be pulled and as soon as the block shows signs of movement I will record the amount of Newtons needed. Each test will be done 5 times then averaged. To make sure it is a fair test I will: unless it breaks use the same Newton meter, I will use the same block and the same side of the block every time, I will use the same substance/type of substance for instance making sure the sandpaper comes from the same sheet. I will also keep the movement of the block parallel to the supporting surface. Although smoothness is hard to measure I predict that the smoother a substance is to the touch, the less friction will be produced, because the smoother a substance is to the touch the less sharp or outstanding the ridges are, therefore the less resistance they cause. Key Substances: Silicon based carbon paper: Si Emery paper: Bs Sand paper: S Table top: TT Plastic Bag: Pb Substance T1(N) T2(N) T3(N) T4(N) T5(N) Average Si 3 2.5 2.5 2.5 2.5 2.6 Bs 2 1.5 1.5 1.6 1.6 1.64 S 2 2 1.75 2 2 1.95 TT 1 1 0.9 0.9 0.9 0.94 Pb 0.4 0.4 0.4 0.4 0.4 0.4 As I predicted the smoother a substance feels to be, the less it causes resistance, as shown in the results. I followed my method very strictly any variation caused by my hand is small to negligible, and would not greatly affect the results. I have come to the conclusion that for a substance to reach minimal resistance it can achieve this being light weight, smoothly textured and have minimal contacting surface area with the opposing surface. If a substance is required to have maximum resistance it would be the opposite. I feel the experiment was performed rather well but there is room for improvement, to have maybe got fairer more accurate results I could have maybe repeated the experiment once or twice on all of them, then I would have more data to analyse giving me a better chance at accuracy. In all the three experiments instead of using the human hand to pull the Newton meter use a machine which would be less prone to inconsistency and use a table top free of blemishes. In the second experiment the block could have been placed on previously constructed platforms each measured to have 4 sides the same and those sides to be the measurements used meaning the non need of paper and a lot more accurate readings.

Hinduism and Buddhism Essay -- Religion religious Compare Contrast Ess

Hinduism and Buddhism The concept of God It is first of all necessary to establish what is meant by the term "God". This term is used to designate a Supreme Being endowed with the qualities of omnipotence and omniscience, which is the creator of the universe with all its contents, and the chief lawgiver for humans. God is generally considered as being concerned with the welfare of his human creatures, and the ultimate salvation of those who follow his dictates. God is therefore a person of some kind, and the question whether such an entity exists or not is fundamental to all theistic systems. In contrast to this notion of a personal God some modern theologians have interpreted the term "God" as representing some kind of abstract principle of good. This view was first developed in the ancient Indian Upanishads where God is equated with an abstract principle, the Brahman. The ancient Indian philosophers could entertain such a view because they also had a theory of karma, which really does away with the need for a personal God. Buddhists too have a theory of karma, which is different from that of the Hindus, and which even more unequivocally dispenses with the need for a deity. The use of the term "God' to denote an abstract reality by monotheistic theologians who have no theory of karma is difficult to justify, consequently this is merely a device to explain away the contradictions that arise from the notion of a personal God. In fact the actual practice of theistic religion proceeds as if God is a real person of some kind or other. Buddhism Buddhist gods Buddhism has 33 Gods the most potent one of them all is Indra. It is Buddhist beliefs that the gods and spirits are with us persistently. The mountain Meru can be compared with mount Olympus of the Greek gods. Buddhists believe that on top of this sacred mountain are the 33 gods with Indra as their principal. Buddhism primary principal is moral strength and exercises. It is concluded in three regions. The first is the principles of lust, which belongs to the realm of animals, humans and various divine essences. The realm of the gods consists of six levels, which are the liberation of material desires. The subsequent region compromises entities that are born in the dominion of the Braham gods liberated from lust and wishes, they constitute a term of embodiment. They divide in four stages wh... ...e if one means by originality an idea or an utterance not found previously in any creed or philosophy, or never before inculcated by any moral and spiritual leader, then surely you cannot find it anywhere. Neither Abraham nor Moses nor Jesus nor Buddha nor Muhammed said anything that could not be found either in the religious tradition in which they were born or in creeds and philosophies in other times and places. Many of the great moral teachers often make a direct reference to others, and even if they do not, one can relate their ideas to something that has gone before. To Pernilla Thank you for being patient and I apologize for not turning it in the day I was to. Enjoy your trip. Sources: Internet www.hinduweb.com www.islam-guide.com www.buddhanet.com CD-ROM Encyclopedia Websters concise interactive Encyclopedia Printed in 1996 by Merriam-Webster Microsoft Encarta Uppslagsverk 2001 Printed in 2001 by Microsoft Corporation Books Religions for Today Authour: Roger Whiting Stanley Thornes Publisher Ltd Printed in 1991 The New Webster’s International Encyclopedia Revised Edition 1998 Edition and published by Trident Press International

Bill Gates: the Man Behind the Success of Microsoft

William Henry â€Å"Bill† Gates III (born October 28, 1955) is an American business magnate, investor, philanthropist, and author. Gates is the former CEO and current chairman of Microsoft, the software company he founded with Paul Allen. He is consistently ranked among the world's wealthiest people and was the wealthiest overall from 1995 to 2009, excluding 2008, when he was ranked third, in 2011 he was the wealthiest American and the second wealthiest person. During his career at Microsoft, Gates held the positions of CEO and chief software architect, and remains the largest individual shareholder, with 6. percent of the common stock. He has also authored or co-authored several books. Gates is one of the best-known entrepreneurs of the personal computer revolution. Gates has been criticized for his business tactics, which have been considered anti-competitive, an opinion which has in some cases been upheld by the courts. In the later stages of his career, Gates has pursued a number of philanthropic endeavors, donating large amounts of money to various charitable organizations and scientific research programs through the Bill & Melinda Gates Foundation, established in 2000. Gates stepped down as chief executive officer of Microsoft in January 2000. He remained as chairman and created the position of chief software architect. In June 2006, Gates announced that he would be transitioning from full-time work at Microsoft to part-time work, and full-time work at the Bill & Melinda Gates Foundation. He gradually transferred his duties to Ray Ozzie, chief software architect, and Craig Mundie, chief research and strategy officer. Gates' last full-time day at Microsoft was June 27, 2008. He remains at Microsoft as non-executive chairman

Overview of the Branches of Chemistry

There are several branches of chemistry. Here is a list of the main branches of chemistry, with an overview of what each branch of chemistry studies. Types of Chemistry Agrochemistry - This branch of chemistry may also be called agricultural chemistry. It deals with the application of chemistry for agricultural production, food processing, and environmental remediation as a result of agriculture. Analytical Chemistry - Analytical chemistry is the branch of chemistry involved with studying the properties of materials or developing tools to analyze materials. Astrochemistry - Astrochemistry is the study of the composition and reactions of the chemical elements and molecules found in the stars and in space and of the interactions between this matter and radiation. Biochemistry - Biochemistry is the branch of chemistry concerned with the chemical reactions that occur inside living organisms. Chemical Engineering - Chemical engineering involves the practical application of chemistry to solve problems. Chemistry History - Chemistry history is the branch of chemistry and history that traces the evolution over time of chemistry as a science. To some extent, alchemy is included as a topic of chemistry history. Cluster Chemistry - This branch of chemistry involves the study of clusters of bound atoms, intermediate in size between single molecules and bulk solids. Combinatorial Chemistry - Combinatorial chemistry involves computer simulation of molecules and reactions between molecules. Electrochemistry - Electrochemistry is the branch of chemistry that involves the study of chemical reactions in a solution at the interface between an ionic conductor and an electrical conductor. Electrochemistry may be considered to be the study of electron transfer, particularly within an electrolytic solution. Environmental Chemistry - Environmental chemistry is the chemistry associated with soil, air, and water and of human impact on natural systems. Food Chemistry - Food chemistry is the branch of chemistry associated with the chemical processes of all aspects of food. Many aspects of food chemistry rely on biochemistry, but it incorporates other disciplines as well. General Chemistry - General chemistry examines the structure of matter and the reaction between matter and energy. It is the basis for the other branches of chemistry. Geochemistry - Geochemistry is the study of chemical composition and chemical processes associated with the Earth and other planets. Green Chemistry - Green chemistry is concerned with processes and products that eliminate or reduce the use or release of hazardous substances. Remediation may be considered part of green chemistry. Inorganic Chemistry - Inorganic chemistry is the branch of chemistry that deals with the structure and interactions between inorganic compounds, which are any compounds that arent based in carbon-hydrogen bonds. Kinetics - Kinetics examines the rate at which chemical reactions occur and the factors that affect the rate of chemical processes. Medicinal Chemistry - Medicinal chemistry is chemistry as it applies to pharmacology and medicine. Nanochemistry - Nanochemistry is concerned with the assembly and properties of nanoscale assemblies of atoms or molecules. Nuclear Chemistry - Nuclear chemistry is the branch of chemistry associated with nuclear reactions and isotopes. Organic Chemistry - This branch of chemistry deals with the chemistry of carbon and living things. Photochemistry - Photochemistry is the branch of chemistry concerned with interactions between light and matter. Physical Chemistry - Physical chemistry is the branch of chemistry that applies physics to the study of chemistry. Quantum mechanics and thermodynamics are examples of physical chemistry disciplines. Polymer Chemistry - Polymer chemistry or macromolecular chemistry is the branch of chemistry the examines the structure and properties of macromolecules and polymers and finds new ways to synthesize these molecules. Solid State Chemistry - Solid state chemistry is the branch of chemistry that is focused on the structure, properties, and chemical processes that occur in the solid phase. Much of solid state chemistry deals with the synthesis and characterization of new solid state materials. Spectroscopy - Spectroscopy examines the interactions between matter and electromagnetic radiation as a function of wavelength. Spectroscopy commonly is used to detect and identify chemicals based on their spectroscopic signatures. Thermochemistry - Thermochemistry may be considered a type of Physical Chemistry. Thermochemistry involves the study of thermal effects of chemical reactions and the thermal energy exchange between processes. Theoretical Chemistry - Theoretical chemistry applies chemistry and physics calculations to explain or make predictions about chemical phenomena. There is overlap between the different branches of chemistry. For example, a polymer chemist typically knows a lot of organic chemistry. A scientist specializing in thermochemistry knows a lot of physical chemistry.