Security Testing from Agile Perspective - Free Essay Example

Sample details Pages: 5 Words: 1484 Downloads: 8 Date added: 2017/09/25 Category Advertising Essay Type Argumentative essay Tags: Development Essay Did you like this example? Security testing from perspective of scrum development Rudra Prasad Tripathy Ph. D. scholar, Utkal university Technical architect, JDA india software(P) Ltd. Hyderabad,India [emailprotected] com Ranjit Kumar Panda Senior Engineer, MindTree Limited Bangalore, India panda. [emailprotected] com Abstract— We are trying to show how security testing plays predominant role in secured development and through agile methodology-particularly scrum is a suitable development process. Keywords-scrum;security testing. 1. Introduction Application security is in attention for last few years where security no more allures to network security and transcen. Security testing is also crux of secured development though it’s not getting its due importance. In this paper we would discuss issues involved in security testing in traditional software development lifecycle approach like waterfall and would compare with scrum methodology, which is a agile methodology to see how it would smoothen few issues and would facilitate security testing. We would take cross-side scripting as the example to illustrate the study. 1. 1What is security testing? Application security would basically deals with the situation to try to break the software as what an attacker would do. This is different from traditional testing because of following idiosyncratic features. a. Traditional testing doesn’t deal with what happens if it fails, where as security testing objective to break the system and would play a role of antagonist. Hence it requires dexterity and experience to draw suitable test cases apart from tools and frameworks.. b. This would be part of risk management and hence need to reckon the cost involved. We may need to define adequate security [1] parlance to application’s business domain and value proposition aimed at. For example definition of adequate security a online credit card application and online healthcare system would differ. Hence prioritiz ation and budgeting of resources are few factors need to be considered. c. Testing of different possible vulnerabilities [2]. 1. 2Security testing approaches. Currently application security testing has been done as a white box testing, may be with help of few tools like static analysis tools to study the vulnerability. Apart from that non functional testing has been conducted to see chance of failures against vicarious attack of adversary. 1. 3Cross-Site Scripting Cross-Site Scripting (XSS) vulnerabilities were verified as executing code on the web application. This occurs when dynamically generated web pages display user input, such as login information, that is not properly validated, allowing an attacker to embed malicious scripts into the generated page and then execute the script on the machine of any user that views the site. XSS can generally be subdivided into two categories-stored and reflected attacks. Stored attacks are something like form stored on the target server, such as in a database, or via a submission to a bulletin board or visitor log. Reflected attacks, on the other hand, come from somewhere else. This happens when user input from a web client is immediately included via server-side scripts in a dynamically generated web page. Insufficient filtering of client-supplied data that is returned to web users by the web application is the major cause. In many cases, the client-supplied data is being used in the HTTP headers, which could be exploited by using carriage return-linefeed sequence-an attacker can add HTTP headers to the response and completely write the body of the HTTP request. 2. MOTIVATION In one of the web application, an XSS was found through use of third party tool. This was a critical defect. Design had been made and after implementation code had been tested by security compliance team. Cross-site scripting carried out on websites were roughly 80% of all security vulnerabilities documented by Symantec as of 2007. A ful l security review usually involves more than just seeking out XSS vulnerabilities. it also involves overall threat modeling, testing for different threats like overflows, information disclosure, error handling, SQL injection, authentication, and authorization bugs. The nice thing is that doing a thorough job in any one area often overlaps with another. Like, while testing for XSS vulnerabilities, you will very often identify error handling and information disclosure problems as well. Though automated tool like webinspect were available, we did some manual testing through a tool called Paros [8] for HTTP traffic interception. Intercepting the client GET and POST requests is extremely important. One could circumvent any sort of client-side JavaScript input validation code that may have been pushed down. A simple test will be changing a get parameter in the request. Let the URL is as below https://www. yoursite. com/index. html? param=test. One would modify the URL like https://w ww. yoursite. com/index. html? name=alert(XSS), and subsequently, if a popup opens up saying XSS then this parameter is open to XSS vulnerable. Paros Proxy is used to intercept the request parameter. Using this tool we will inject some malicious javascript code into the cookies, header or form parameters. If the code will be executed while the response is displayed in the browser, the application is vulnerable to XSS. 2. 1 Security testing models There are many methodologies proposed by SEI [5] like SSE-CMM, TSM for secured development. Following are the steps for secured development life cycle [4] followed at Microsoft. Stage 0: Education and Awareness Stage 1: Project Inception Stage 2: Define and Follow Design Best Practices Stage 3: Product Risk Assessment Stage 4: Risk Analysis Stage 5: Creating Security Documents, Tools, and Best Practices for Customers Stage 6: Secure Coding Policies Stage 7: Secure Testing Policies Stage 8: The Security Push Stage 9: The Final Security Re view Stage 10: Security Response Planning Stage 11: Product Release Stage 12: Security Response Execution This best suits to development practice like waterfall model. 2.. 2 Techniques for security testing Though security testing requires some level of craftsmanship, still we could derive some common techniques for analysis. We can broadly divide insecurities into two categories –insecurity by design and insecurity by implementation [7]. Analyses of bugs are another way of identifying the problem and deriving the solution, to some extent general use of this could be ascribes to already available taxonomies. We could see how following agile practice would better tackle the problems and techniques could be applied in a better way. 3. ACHIEVING AGILITY Many enterprises like Microsoft [9], IBM have presented skewed steps of normal life cycle to achieve agility Followings are mapping between steps provided for agile development features of scrum process. In above mentioned w orks authors try to explain from waterfall perspective of agile. In the following points, we are trying to show how agile is inherently suitable for secured development and particularly for security testing. . Short development period A typical development period is 2-3 weeks which means at end of every sprint one would test the software. In various papers, limitation of seven plus minus two has been advocated. Duration of 2-3 week development would make it easier for a security tester to identify impacted area, hence would help in fuzz testing. ii. Incremental development As the development is incremental, work like threat modeling. It also help in planning when to implement requirement exceptions and hence security review. iii. Cross functional team As there is paucity of security experts, one would conduct sprints specific to implement security features. As output application size is incremental developer would find it easy to do code review and rectify cryptographic error cod e. iv. Defining done Though 2-3 weeks is a small amount of time, we cannot really achieve everything. But we could define what we mean by done. We may define identifying issues as done only, may be through static analysis tool. There is a flexibility to inject short sprints in between where we could pick up security implementation instead of product features. Hence agile is a natural choice for secured development. v. No Documentation Maintaining document for threat modeling and other security test cases would be redundant and overhead maintaining documents for satisfying process requirement would not be required. Hence from process perspective we don’t need to do agile, secured testing can be agile. 4. CONCLUSION There is a gap in understanding of scrum from quality perspective. We tried to bridge the gap and to make development process more secured. Further empirical studies and experience papers would help to buttress use of agile for development of secured applicati ons and products. References 1]Bruce Potter and McGraw Gary, â€Å"Software Security Testing† [Article], IEEE Security and Privacy. 2004. pp. 32-35. 2]C. E. Landwehr et al. , â€Å"A Taxonomy of Computer Program Security Flaws,with Examples†, tech. report NRL/FR/5542—93/9591, Naval Research Laboratory, Nov. 1993. 3]Allen Julia, Barnum Sean, Ellison Robert, McGraw Gary and Mead Nancy. â€Å"Software Security: A Guide for Project Managers†, Addison-Wesley, 2008. 4]Steve Lipner,Michael Howard,†The Trustworthy Computing Security Development Lifecycle†,Security Engineering and Communications Security Business and Technology Unit,Microsoft Corporation, March 2005. 5]Noopur Davis,†Secure Software Development Life Cycle Processes†, Software Engineering Institute ,2009. 6]K Tsipenyuk, B Chess, G McGraw IEEE Security Privacy Magazine, 2005 7]OWASP Top Ten Most Critical Web Application Security Vulnerabilities, https://www. owasp. org /documentation/topten. html 8]https://www. parosproxy. org 9]https://www. blackhat. com/presentations/bh-dc-10/Sullivan_Bryan/BlackHat-DC-2010-Sullivan-SDL-Agile-wp. pdf Don’t waste time! 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Wildlife-Conservation and Importance (India) Free Essays

Conservation is the act of using and protecting resources properly. Catching animals, throwing garbage, and using and harnessing the different resources should all adhere to the proper way of conservation. \ Wildlife includes all non-domesticated plants, animals and other organisms. We will write a custom essay sample on Wildlife-Conservation and Importance (India) or any similar topic only for you Order Now Domesticating wild plant and animal species for human benefit has occurred many times all over the planet, and has a major impact on the environment, both positive and negative. Wildlife can be found in all ecosystems. Deserts, rain forests, plains, and other areas including the most developed urban sites Importance for Wildlife Conservation * Maintains ecological balance the organisms have their unique positions in food chains, food webs which keep ecological balance. * Wild life contributes to the maintenance of material cycles such as carbon and nitrogen cycles. * For improvement and progress in agriculture, animal husbandry and fisheries the genes from wild life preserved as gene bank are utilised in breeding programmes. * Wild life provides a number of useful products like food, medicine, honey, lac, wax, resin, etc. * Colourful birds, insects, beautiful flowers, trees make environment beautiful. Nature†¦ (Indescribable) Food, pets, traditional medicines Anthropologists believe that the Stone Age peoples and hunter-gatherers relied on wildlife, both plant and animal, for their food. In fact, some species may have been hunted to extinction by early human hunters. Today, hunting, fishing, or gathering wildlife is still a significant food source in some parts of the world. In other areas, hunting and non-commercial fishing are mainly seen as a sport or recreation, Many Amazon species, including peccaries, agoutis, turtles, turtle eggs, anacondas, armadillos, etc. are sold primarily as food. Others in these informal markets, such as monkeys and parrots, are destined for the pet trade, often smuggled into the United States. Still other Amazon species are popular ingredients in traditional medicines sold in local markets. The medicinal value of animal parts is based largely on superstition. Religion Many wildlife species have spiritual significance In different cultures around the world, and they and their products may be used as sacred objects in religious rituals. For example, eagles, hawks and their feathers have great cultural and spiritual value to Habitat destruction and fragmentation Farms sprawl across the landscape with paddocks. Media Wildlife has long been a common subject for educational television shows. National Geographic specials appeared on CBS beginning in 1965, The BBC natural history unit in the UK was a similar pioneer, the first wildlife series LOOK presented by Sir Peter Scott, was a studio-based show, with filmed inserts There are many magazines which cover wildlife including National Wildlife Magazine, Birds Blooms, Birding (magazine), and Ranger Rick (for children). Tourism Fuelled by media coverage and inclusion of conservation education in early school curriculum, Wildlife tourism Ecotourism has fast become a popular industry generating substantial income for developing nations with rich wildlife specially, Africa and India. Destruction The rate of extinctions of entire species of plants and animals across the planet has been so high in the last few hundred years it is widely considered that we are in the sixth great extinction event on this planet; the Holocene Mass Extinction. The four most general reasons that lead to destruction of wildlife include Overkill. Overkill occurs whenever hunting occurs at rates greater than the reproductive capacity of the population is being exploited. Hunting, fishing and so on, has lowered the competition between members of a population. However, if this hunting continues at rate greater than the rate at which new members of the population can reach breeding age and produce more young, the population will begin to decrease in numbers. Habitat destruction and fragmentation The habitat of any given species is considered its preferred area or territory. Many processes associated human habitation of an area cause loss of this area and decrease the carrying capacity of the land for that species. Examples of habitat destruction include grazing of bush land by farmed animals, changes to natural fire regimes, forest clearing for timber production and wetland draining for city expansion. Impact of introduced species The vast majority of species exposed to a new habitat do not reproduce successfully. Occasionally, however, some populations do take hold and after a period of acclimation can increase in numbers significantly, having destructive effects on many elements of the native environment. The Rattus Rattus is native to India, but it has spread to almost everywhere in the world. This rat has directly caused, or contributed to, the extinction of multiple wildlife species including a variety of birds, plants and other small mammals. They’re blamed for the incredible decline in seabirds on several islands, including many Hawaiian species Some introduced species (such as most of our food crops and pets) are beneficial. However, others are very damaging. People have moved species around the world for millenia, sometimes by accident, but often with considerable enthusiasm. English garden birds in New Zealand are merely quaint curiosities introduced by settlers wanting the familiar species of their former homes. Some introductions have been devastating — goats or rabbits on various islands, for example. Other introductions, such as those of genetically engineered organisms, present potential problems yet to be considered in any detail. Chains of extinction This final group is one of secondary effects. Large herbivorous animals such as the hippopotamus have populations of insectivorous birds that feed off the many parasitic insects that grow on the hippo. Should the hippo die out, so too will these groups of birds, leading to further destruction as other species dependent on the birds are affected. Also referred to as a Domino effect Wildlife of India The wildlife of India is a mix of species of diverse origins. According to one study, India along with 17 mega diverse countries is home to about 60-70% of the world’s biodiversity. India’s wildlife is both rich and varied. More than 4% of India’s land is under forest cover- there are at least 90 national parks and 482 wildlife sanctuaries. The country is one of the 12 mega diversity areas in the world, in terms of animal. Many Indian species are descendants of taxa originating in Gondwana, to which India originally belonged. Peninsular India’s subsequent movement towards, and collision with, the Laurasian landmass set off a mass exchange of species. Fauna the political boundaries of India encompass a wide range of ecozones—desert, high mountains, highlands, tropical and temperate forests, swamplands, plains, grasslands, areas surrounding rivers, as well as island archipelago. It hosts three biodiversity hotspots: the Western Ghats, the Eastern Himalayas, and the hilly ranges that straddle the India-Myanmar border. The region is also heavily influenced by summer monsoons that cause major seasonal changes in vegetation and habitat. India is home to several well known large mammals including the Asian Elephant, Bengal Tiger, Asiatic Lion, Leopard and Indian Rhinoceros. Some of these animals are engrained in culture, often being associated with deities. These large mammals are important for wildlife tourism in India and several national parks and wildlife sanctuaries cater to these needs. The need for conservation of wildlife in India is often questioned because of the apparently incorrect priority in the face of direct poverty of the people. Skins of various animals including the tiger in Kashmir However Article 48 of the Constitution of India specifies that, â€Å"The state shall endeavor to protect and improve the environment and to safeguard the forests and wildlife of the country† and Article 51-A states that â€Å"it shall be the duty of every citizen of India to protect and improve the natural environment including forests, lakes, rivers, and wildlife and to have compassion for living creatures. Recent extinctions Exploitation of land and forest resources by humans along with hunting and trapping for food and sport has led to the extinction of many species in India in recent times. These species include mammals such as the Indian /Asiatic Cheetah, Javan Rhinoceros and Sumatran Rhinoceros Many species have not been seen since their description. The Bengal Tigers in India, although they are threatened to extinction. Some species of birds have gone extinct in recent times, including the Duck and the Himalayan Quail Flora The Flora of India is one of the richest of the world due to a wide range of climate, topology and environments in the country. With about 47000 species of plant species, it occupies tenth place in the world. It is thought there are over 15000 species of flowers in India, which account for 6 percent of the total plant species in the world. [1] and probably many more species. Since ancient times, use of plants as a source of medicines has been the inherent part of life in India. There are more than 3000 officially documented plants in India that holds great medicinal potential. India comprises of seven percent of world’s flora. India is divided into main eight floristic regions namely – Western Himalayas, Eastern Himalayas, Assam, Indus plain, Ganga plain, the Deccan, the Malabar and the Andamans. The classification and ranking of plants varies. Recent extinctions Kerala Legume Tree(1870, India) Arunchal Hopea Tree(1996, India)Nilgiri Holly –(1859, India)Karnataka Sapota(1900, India)Meghalaya Sterculia (1877, India)Courtallum Wendlandia(1997, India) Avi-faunas In India India is blessed with over 2000 species and sub-species of birds. The diverse birdlife of the forests includes large hornbills, serpent eagles and fishing owls, as well as the elegant national bird, the peacock. Waterbirds, such as herons, ibises, storks, cranes, pelicans and others, are seen not only in parks but at numerous special waterbird sanctuaries. These sanctuaries contain large breeding colonies, and are of great importance for the countless numbers of migrating birds which visit India annually. Reptiles In India Among the other wildlife are over 500 species of reptiles and amphibians, including magnificent king cobras, pythons, crocodiles, large freshwater tortoises and monitor lizards. A huge number of snake varieties, lizards and crocodiles account for the reptile count. Snakes include the deadly King cobras to the equally poisonous Kraits. Scorpions and insects are a plenty in this country. Major threats to wildlife Major threats to wildlife can be categorized as below: Habitat Loss: Fewer natural wildlife habitat areas remain each year. Moreover, the habitat that remains has often been degraded to bear little resemblance to the natural wild areas which existed in the past. †¢ Climate Change: Because many types of plants and animals have specific habitat requirements, climate change could cause disastrous loss of wil dlife species. A slight drop or rise in average rainfall will translate into large seasonal changes. Hibernating mammals, reptiles, amphibians and insects are harmed and disturbed. Plants and wildlife are sensitive to moisture change so, they will be harmed by any change in the moisture level. Pesticides Toxic Chemicals: Pesticides are deliberately spread to make the environment toxic to certain plants, insects, and rodents, so it should not be surprising that other plants and wildlife are deliberately harmed at the same time. In addition many chemical pollutants are toxic to wildlife, such as PCBs, mercury, petroleum by-products, solvents, antifreeze, etc. †¢ Hunting and Poaching: Unregulated hunting and poaching causes a major threat to wildlife. Along with this, mismanagement of forest department and forest guards triggers this problem. †¢ Natural Phenomenon: Floods, earthquakes, volcanoes, lightning, forest fires How to cite Wildlife-Conservation and Importance (India), Papers

Horrifying Effects of a Senseless War Essay Example For Students

Horrifying Effects of a Senseless War Essay Horrifying Effects of a Senseless WarDirty Work is an irresistible debut novel from one of the greatest novelist in American literature today. Throughout each chapter, Larry Brown creatively changes the narrator between the two main characters, which works magnificently. He is bold and decisive in his telling of two disabled individuals being tormented by the physical and emotional hell they withstand in the everlasting Vietnam. Braiden Chainey has no arms or legs due to a machine gun (73). Walter James, thanks to a rocket grenade, no longer has his face (66). As they lay side by side in their separate beds in a V.A. hospital 22 years later, their wounds still ache. These two Mississippians, one white and one black, tell each other their horrendous stories. One by one, they take turns describing the details of their lives and the outcome wanted for their future. Many old themes of literature are invoked in this astonishing tale of hatred, emotion, vengeance, and even passion. Their vivid memories portray the true reality of how that horrifying war gave the veterans the unforgettable long-term effects. Dirty Work is an extraordinary novel, which continuously shows the harsh realities of a powerful war. The two main characters in this novel are compelling. Every feature and emotion mentioned about each individual are so realistic that they are unforgettable. From their family background to their scars of war, each and every aspect is told with such detail and brilliance that the story almost comes to life. Brown utilizes southern slang to the greatest. When Braiden and Walter speak to each other, they perfectly mimic the mistakes and shortenings of everyday southern speech. Most of the dialect indicates brilliantly the way that people whom the author might have encountered at times in his life may have spoken. In one passage, Walter speaks with a nurse, showing their strong southern culture coming out through speech:â€Å"Where’d you learn that song?†Ã¢â‚¬Å"Known that all my life, So you one of themDirty Work is strongly in the tradition of a classic war book with some southern heritage. The emotional, yet sometimes humorous characters give the novel such life that it is hard to put it down until it is over. Brown certainly succeeds with his first novel, which is a magnificent examination of the way the wounds, physical and emotional, that generation endured so many years ago, still haunt those who both loved and cared for the brave soldiers who were wounded in this sense less war. Bibliography:Works CitedBrown, Larry. Dirty Work. New York: Vintage Books, 1989.

Newtons Second Law Essay Example

Newtons Second Law Essay To confirm the relationship between the net force applied to a body and the bodys acceleration.Background:This experiment has two parts; Part A: How does the acceleration of a trolley change as you change the weight of the total mass on a mass holder supported by a pulley?; Part B: How does the acceleration of a trolley change as you change the weight of the total mass on the trolley itself?When the trolley is released, it accelerates to the right due to the mass on the mass holder, passing through two light gates. A scalar timer connected to each light gate records the time taken for a card mounted on the glider to pass through the light gate The time recorded at the two light gates is used to calculate 2 different speeds of the glider, and hence the acceleration of the glider may be found.Equipment: Trolley, 2 light gates, 2 scalar timers, masses, string, card, ruler, electric scalePart A:Data Collection:Mass of Weight (g)Time (s)Trial 1Trial 2Trial 3Trial 4LG1LG2LG1LG2LG1LG2LG1LG2 300.840.440.870.450.850.440.860.44400.620.330.640.320.630.320.620.32500.520.280.530.270.530.270.530.27600.450.240.460.240.460.240.460.24700.420.220.420.220.410.210.410.21800.390.200.390.200.390.200.390.20900.370.190.360.190.360.190.360.191000.340.170.340.180.340.170.340.181100.320.170.320.170.320.170.320.171200.300.160.300.160.300.160.300.16Constants:Mass of car 607.8 gDistance between light gate 1(LG1) to light gate 2 (LG2): 30 cmCard length: 17 cmData Processing:To convert the masses to forces we must do the following. Since the measurements are taken in grams we need to divide by 1000. This makes our measurements change to kilograms. After that we need to multiply by 9.8 because 1 kg is 9.8 N.Mass of Weight (g)Force (N)300.29400.39500.49600.59700.69800.78900.881000.981101.081201.18Since we have more than one trial for each mass, we need to find the average times for each mass.Average Times:Force (N)LG1 Time (s)LG2 Time (s)0.290.860.440.390.630.320.490.530.270.590.460.240.690.420. 220.780.390.200.880.360.190.980.340.181.080.320.171.180.300.16If then to calculate the velocity we will take the length of the card (17 cm) which is d, and divide it by the average times.Velocities:Force (N)LG1 Velocity (ms-1)LG2 Velocity (ms-1)0.290.200.380.390.270.530.490.320.620.590.370.710.690.410.790.780.440.850.880.470.890.980.500.971.080.531.001.180.571.06To calculate the acceleration we will need to use the following equation for motion:The next step is to make a (acceleration) the subject of the equationThis means that, where v is final velocity, u is initial velocity, and s is the distance traveled which is a fixed value of 30 cm (Distance between Light Gate 1 and Light Gate 2)Acceleration:Force (N)Acceleration (ms-2)0.290.180.390.340.490.480.590.610.690.760.780.890.880.970.981.161.081.201.181.35There is a linear relationship in this graph; this shows that the net force is directly proportional to the acceleration.Part B:Data Collection:Additional Mass of Cart (g)Time (s)T rial 1Trial 2Trial 3Trial 4LG1LG2LG1LG2LG1LG2LG1LG200.390.200.390.200.400.200.400.20500.420.210.430.220.420.210.430.221000.460.230.460.230.450.230.450.231500.490.250.500.250.490.250.490.252000.510.260.500.250.520.270.510.262500.540.280.550.280.540.280.550.283000.580.290.570.290.590.290.570.293500.610.310.610.310.610.310.610.314000.660.340.650.330.660.350.650.344500.790.390.780.390.800.400.780.38Constants:Mass of car: 407.7 gDistance between light gate 1(LG1) and light gate 2 (LG2): 30 cmCard length: 17 cmMass on Pulley: 50 gData Processing:Mass of Cart:To find the mass of the cart we need to add the initial mass of the cart to the additional mass added onto it. We also need to convert this number into kilograms.Additional Mass on Cart (g)Mass of Cart (g)Mass of Cart (kg)0407.70.4150457.70.46100507.70.51150557.70.56200607.70.61250657.70.66300707.70.71350757.70.76400807.70.81450857.70.86Since we have more than one trial for each mass, we need to find the average times for each mass.Av erage Times:Mass of Cart (kg)LG1 Time (s)LG2 Time (s)0.410.400.200.460.430.220.510.460.230.560.490.250.610.510.260.660.550.280.710.580.290.760.610.310.810.660.340.860.790.39If then to calculate the velocity we will take the length of the card (17 cm) which is d, and divide it by the average times.Velocities:Mass of Cart (kg)LG1 Velocity (ms-1)LG2 Velocity (ms-1)0.410.430.850.460.400.790.510.370.740.560.350.680.610.330.650.660.310.610.710.290.590.760.280.550.810.260.500.860.220.44To calculate the acceleration we will need to use the following equation for motion:The next step is to make a (acceleration) the subject of the equationThis means that, where v is final velocity, u is initial velocity, and s is the distance traveled which is a fixed value of 30 cm (Distance between Light Gate 1 and Light Gate 2)Acceleration:Mass of Cart (kg)Acceleration (ms-2)0.410.900.460.770.510.680.560.570.610.520.660.460.710.440.760.370.810.300.860.24Since we are getting a hyperbola shape in the graph, we will try to graph Mass of Cart vs. Acceleration-1 to get a linear relationship.I think that the last two points are outliers and they have been subject to lots of error. This is why I will draw the graph again without including them in the trend line.These graphs show that the mass of the cart is inversely or indirectly proportional to the acceleration. This means that the mass of the cart is directly proportional to the inverse of the acceleration.Conclusion and Evaluation:Figure 1Figure 2The aim of this lab is to confirm the relationship between the net force applied to a body and the bodys acceleration. The experiment has two parts: Part As aim is to see how the net force applied to a body affects the acceleration and Part Bs aim is to see what happens to the acceleration as you increase the mass of the cart.Obviously, the higher the net force on a body, the larger its acceleration. This is the obvious thing we found out from part a. In part B we found out that as the mass of the cart increased, its acceleration decreased. This is where the errors come in.This experiment was designed in a way the friction would be very minute or inexistent. The first set-up is using an air track; this allows the vehicle to move freely without friction due to a cushion of air being blown through the air track. The second set-up is using a friction compensated runway; this runway cancels out the effect of friction. However, our set-up included friction; this means that our results are distorted. The other thing is that all the values for the acceleration are lower than the actual value. This is because of Friction; all these calculations neglect the effect of friction. Friction makes a body move slower, slow moving bodies have a large inertia, so all the values of Mass are larger than the actual value.Assume there are two bodies, body A and body B. They are traveling on different surfaces but are pushed with the same force. Body A has a smaller net force than body B; there fore you assume that Body A has a larger mass than Body B or Body B has a larger acceleration than Body A. What if I told you that this is not the case? Maybe Body A and Body B have the same mass, what would you think? It would be logical to think that there are other forces acting on the system, Friction. Body A is traveling on a wooden surface (friction is present), Body B is traveling on a slippery, frictionless surface (friction is not present). So Body A doesnt have a larger mass than Body B, its just the surfaces that make us think so. This is the same here; these calculations assumed that friction was something else, which is why there are absurd numbers.If then imagine that a tension force of 1 N is acting on a body which is accelerating a 5 meters per second squared. and and This means the mass of the body equals 0.2 kilograms. What is happening in our situation is that our acceleration is smaller than it should be due to the other forces acting on the cart, like friction a nd air resistance. For example, instead of 5 ms-2 it is 4ms-2. This causes for there to be an error in our calculations.and and . This means the mass of the body is 0.25 kilograms- but its not. This value is larger than the real value, and this is exactly what is happening to us.The same problem exists in Part B. The net force is always less than the real value, 0.49 N. This is due to the other forces acting on the body like friction and air resistance., in part B the net force is always constant and the mass and acceleration are always changing. Since the acceleration is going to be smaller than it should be (due to the other forces acting on the body) the net force will also be smaller than it should be.The other problem with including friction comes in part B. When you add weights on the cart, you increase the force of gravity acting on the cart and the force of normal reaction acting on the cart (Figure 2). But, as you increase the mass of the cart you push the cart and make it come closer to the surface it is in contact with. This increases the force of friction and makes is increase as you increase the mass of the cart.The other (smaller) errors in our lab were the following. Firstly, the way we released the weight that would pull the cart was different each time, there is no way of keeping that the same no matter how hard we try. Secondly, we drew a line that shows where we are supposed to release the cart; the cart will never be in the same position as it was the first time we released it. Finally, we did this lab in two sittings, this means the environment changed and we had to make some adjustments, this affected the accuracy of our lab.To ensure the accuracy of our lab we did many things. Firstly, we measured the distance between the light gates more than one and between trials. Secondly, we made sure that the light gates were placed parallel to the edge of the counter. Also, we drew a line that would show us where we should release the cart. Next, we did four trials instead of three or one trial. We weighed the cart more than once and we measured the length of the card more than once as well. Finally, we tried to keep the lab as accurate as possible by doing the same jobs each time because everybody does their own job in their own way and if that way was kept constant than our results would be more accurate.Next time, we will use a different set-up, preferably with an air-track and a very streamlined glider. We will take even more accurate measurements so that our data would be even more accurate than it is. We will make sure we are releasing the cart from the same place each time, even if it means we need to use a magnifying glass. We will also try to do this lab in one sitting. Finally, we will try to come up with a way in which we will release the cart so that it would be the same each time.

Free Essays on Constitution

The Constitutional Convention began on May 25, 1787, when 55 delegates arrived at Philadelphia’s Independence Hall, then known as the Pennsylvania State House. There the delegates amended the Articles of Confederation. Four questions proved far more difficult to resolve: conflicts over how the people were to be represented in Congress; what to do about slavery; the powers of the president and the procedures for election to the office; and the powers and functions of the federal courts. The delegates settled most of the scores of issues quickly. They then created a new Constitution, a plan of government designed to solve the governmental problems caused under the Articles of Confederation. Since they made such a flexible document it still continues to guide this nation today. The Constitution spells out in six sections the powers of the federal government and the states. Later amendments expanded some of these powers and limited others. For example in document #2 many years later the voting laws were able to be changed so that no matter your race, sex, color, or age as long as your 18 years of age or older, you cant be denied the right to vote. The Constitution prevents cruel or unjust use of power through the separation of powers. In document #4 it talks about the system of checks and balances and how each branch of government has its own responsibilities and cannot take action in areas assigned to the other branches. Otherwise one person or group being in control with all that power would not be good for the nation as a whole. Congress enacts laws, leaving enforcement of the laws to the executive branch and interpretation of them to the judicial branch. As stated in document #5 in the Marbury v. Madison case the judicial branch with the power and authority to interpret the constitution, was provided with a veto over federal laws. The Constitution divides governmental powers in other ways, both w... Free Essays on Constitution Free Essays on Constitution The Constitutional Convention began on May 25, 1787, when 55 delegates arrived at Philadelphia’s Independence Hall, then known as the Pennsylvania State House. There the delegates amended the Articles of Confederation. Four questions proved far more difficult to resolve: conflicts over how the people were to be represented in Congress; what to do about slavery; the powers of the president and the procedures for election to the office; and the powers and functions of the federal courts. The delegates settled most of the scores of issues quickly. They then created a new Constitution, a plan of government designed to solve the governmental problems caused under the Articles of Confederation. Since they made such a flexible document it still continues to guide this nation today. The Constitution spells out in six sections the powers of the federal government and the states. Later amendments expanded some of these powers and limited others. For example in document #2 many years later the voting laws were able to be changed so that no matter your race, sex, color, or age as long as your 18 years of age or older, you cant be denied the right to vote. The Constitution prevents cruel or unjust use of power through the separation of powers. In document #4 it talks about the system of checks and balances and how each branch of government has its own responsibilities and cannot take action in areas assigned to the other branches. Otherwise one person or group being in control with all that power would not be good for the nation as a whole. Congress enacts laws, leaving enforcement of the laws to the executive branch and interpretation of them to the judicial branch. As stated in document #5 in the Marbury v. Madison case the judicial branch with the power and authority to interpret the constitution, was provided with a veto over federal laws. The Constitution divides governmental powers in other ways, both w...

Cultural Communications Essay Example | Topics and Well Written Essays - 750 words

Cultural Communications - Essay Example Business communication in the United States has distinct features that differentiate it from communication in other cultures. Communication style in the United States focuses on the message as opposed to development of long-term relationships during a communication process. Interactions are therefore short-term based and are limited the tasks to be performed. Another feature of the United States communication protocol is individualism culture. People put their self-interest before others, operate independently, and are identified with the culture of â€Å"self promotion† (Nafsa, n.d., p. 1). The American business communication protocol is further informal and disregards social class. Individuals prefer interacting with peers to underscore rank recognitions and even communications with people at higher social classes or ranks are informally conducted without consideration to the ranks (Nafsa, n.d.). Nature of interpersonal relationships is another characteristic behavior in Ame rican business communication. The individualistic approach undermines development of strong interpersonal relationship. Consequently, the culture reports loosely formed relationships that only last for short periods. The loose interpersonal bonds together with the culture of independence also identify lack of long-term obligations in business communications because interactions are limited to tasks. American business communication culture is also direct, involving confrontations. An emerging issue is directly criticized, and people are not afraid to â€Å"discuss controversial topics† (Nafsa, n.d., p. 1). Further, individuals in American culture always feel free to communicate their thoughts (Nafsa, n.d.). Business communication in the culture is also proactive and aligned to applicable rules of law. An American manager would for example comfortably initiate communications to discuss issues and similarly observe legal constraints and consequences of elements of the communicat ions, and agreements made thereof (Li, 2012). A direct approach to communicating feedback also characterizes the culture’s business communication protocol (Hrmagazine, 2008). How the protocols would create challenges The identified protocols in U.S. business communication create challenges by inducing culture based communication barriers in communication with individuals from a different culture. The Americans individualistic approach to communication may not be acceptable to a person from a collective culture, and may lead to suspicions. Similarly, an individualistic approach to communication with a party from a collective culture would communicate selfishness against the communist morals, a factor that would identify ethical concerns and lead to withdrawal from communication as the collectivist seeks to maintain his or her expected moral standards. The United States culture that disregards social hierarchy and cultural practices is also likely to raise ethical concerns and negatively influence communication with a person from a different culture. A person from a culture in which people regard social hierarchy and integrate culture in communication would for example lose interest in a communication in which a young American manager fails to recognize the party’s seniority while negotiating. Failure, by Americans, who do not

The Origins of Slavery on English Mainland North America Essay

The Origins of Slavery on English Mainland North America - Essay Example However, this also suggests that slavery was an important institution within the colonies long before the need for outside support was necessary. â€Å"Unquestionably it was a demand for labor which dragged the Negro to American shores, but the status which he acquired here cannot be explained by reference to that economic motive. Long before black labor was as economically important as unfree white labor, the Negro had been consigned to a special discriminatory status which mirrored the social discrimination Englishmen practiced against him† (Degler, 1959: 62). Investigating the reasons why slavery became such an ingrained element within the North American continental society reveals a deep discrimination combined with a complicated philosophy toward already established social institution led to the development of slavery as it was practiced, regardless of when it appeared in colonial statues. With the introduction of people of darker skin, white man developed a quick and deep discrimination against these people who lived primitive lives and knew nothing of the higher orders of thinking involved in science and technology. While the English who settled the North American shores did not have a tradition of slavery within their culture, they were aware of the idea of slavery that was practiced in Spain and Portugal. â€Å"As early as 1623, a voyager’s book published in London indicated that Englishmen knew of the Negro as a slave in the South American colonies of Spain. The book told of the trade in ‘blacke people’ who were ‘sold unto the Spaniard for him to carry into the West Indies, to remaine as slaves, either in their Mines or in any other servile uses, they in those countries put them to’† (Degler, 1959: 53). This knowledge regarding the construction of slavery suggested lifetime servitude of the dark peoples rather than