Converting gravitational potential energy into kinetic energy Essay Example for Free

Converting gravitational potential energy into kinetic energy Essay Unavoidably, I encountered two anomalous results due to making some of the measurement errors mentioned before. When I plotted my graph, I realised that one of the points was much higher up in relation to the line of best fit while the other was much lower down. I named these measurements A B. The kinetic energy gained by the ball bearing was just more than half of the gravitational potential energy it lost for most measurement e. g. when the ball bearing was dropped from a height of 0. 15 metres, it stored 18. 8 i 10i 4 mJ of potential energy which transformed into 11. 7 i 10i 4 mJ of kinetic energy which is just a bit more than 9. 4 i 10i 4 mJ (half of the gravitational potential energy it stored). Interestingly, for measurement A, when the ball bearing was dropped from 0. 17m, it had gravitational potential energy of 21. 3 i 10i4 mJ but it didnt gain just a bit more than 10. 65 i 10i 4 mJ of kinetic energy but actually gained less than half of the potential energy it stored 10. 2 i 10i 4 mJ. The reason for obtaining this irregular result may have been that I didnt release the ball from the highest point of the runway but a few centimetres further down. This would not have provided enough energy for it to drop down as fast as it did for other measurements because gravitational potential energy ,which the ball bearing stores, depends on height h ( E p = mgh), which is lowered in this case. Therefore, it brought a decrease in the kinetic energy which the ball bearing gained it didnt gain as much kinetic energy as it could have done, had it been dropped from the highest point on the runway. This is why, unlike the other measurements, it gained less than half of the potential energy it stored. Another factor which may have caused this anomalous result could have been that the height of the runway itself wasnt set accurately lower than it should have been so although the gravitational potential energy we calculated = mgh = 0.00125 i 10 i 0. 17 would have been correct theoretically, it would have been practically inaccurate as the actual height set was less than what it should have been (0. 17m) and therefore the ball bearing in reality stored less gravitational potential energy than we calculated . On the other hand, for measurement B, when the ball bearing was dropped from 0. 19m, the ball bearing had gravitational potential energy of 23. 8 i 10i 4 mJ but it didnt gain just a bit more than 11. 9 i 10i 4 mJ of kinetic energy ( 1/2 of the gravitational potential energy) but actually gained a lot more than that. The reason for obtaining the inaccurate result would have been either pushing the ball bearing down the runway or releasing the ball bearing in air on the top of the runway instead of releasing it from rest in contact with the runway floor. Either of these reasons would have provided more energy for the ball bearing to roll down faster therefore it gained more kinetic energy than it did in other measurements when it was released from the top of the runway. Another factor which may have caused this anomalous result can be that the timing of the ball bearing rolling along the distance of 1m was recorded incorrectly or once again, the height wasnt set correctly the actual height set was smaller than what it should have been and therefore the potential energy calculated was less than what the ball bearing had actually stored and therefore the kinetic energy the ball bearing gained was calculated, was more than half of the potential energy which it stored. Finally, if I was going to do this experiment again, I would use more accurate measurement equipment to make my results more accurate. I would   use a computerised stop watch and lasers instead of a manual one to time the ball bearing rolling across the distance of 1m.   do an experiment on more even surfaces to reduce energy being lost in the form of heat by friction when the ball bearing slides down the runway or hits the sides on the way down the runway. Take more measurements for each reading to obtain more reliable and accurate averages Be more careful and alert in measuring and timing.   Have the same person operating the stop watch as different peoples have different reaction times which may not give reliable enough results to reach a firm conclusion.   Do the experiment in the same environment on the same day so that changes in room temperature doesnt affect energy transformations e. g.when the room temperature is higher, the runway floor would become hotter and the ball bearing sliding on it would lose more heat energy by friction. Use an even more accurate metre ruler to make the timing of the ball bearing rolling along the distance of 1m, more accurate.   Enlarge the distance I want the ball bearing to roll along so chances of obtaining inaccurate timing of the ball bearing is reduced.   Use a smoother ball bearing so it loses less energy in the form of heat and sound when it slides along the runway floor.

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In the short story The Ones Who Walk Away from the Omelas, Ursula Le Guin illustrates a community that is joyous. However, the community is torn because the source of their happiness is due to the choosing of an unfortunate child that resides in a basement under of the beautiful public buildings of Omelas neglected and barely ever eating. Le Guin explanation that although the people of the community are very happy, they are also very well aware of what is providing them that happiness. He writes, â€Å"all know [the child] is there†¦ They all know that it has to be there. Some of them understand why, and some do not, but they all understand that their happiness, the beauty of their city, the tenderness of their friendships, the health of their children, the wisdom of their scholars, the skill of their makers, even the abundance of their harvest and the kindly weathers of their skies, depend wholly on this child’s abominable misery† (257). This unjust and cruel pun ishment this child must endure for the sake of the community causes an ethical dilemma that tears apart the community. The ethical dilemma forces the community to acknowledge their living situation and ask themselves: What is more important? Their happiness or this child? Thus, they must make a choice to either walk away from the life and community they have lived in for their whole life because their source of happiness is at the cost of a young boys life. Or, do they continue to live in Omelas and ignore the harsh conditions that this young boy is exposed to. In the story the boy is described as a six-year-old boy that is neglected, locked away in a dirty room, abused mentally and physically, and alone(Le Guin, 257). He barely has any fat on him because all he is fed is â€Å"hal... ...e law, it does not mean that it is right and that we should be so ignorant to reason. In this situation, I would not be able to live with myself knowing that this one little boy is not being fed, being kicked, and left alone to basically die for my happiness. That is completely unacceptable. I believe that while it is innate for us to settle for comfort, we should not live a life that needs abuses someone to accomplish something. According to the categorical imperative, one should abide what they ought to do because it manifests from the moral law. Thus, I would walk away from Omelas because all people are equal and I would not be able to view this boy as a means to my end, which is happiness. Also, if that is the only way for me to achieve happiness then it is not true happiness but superficial emotion that can easily be demolished if anything happens to the boy.

To What Extent Was Grass Roots Activism a Significant Reason to Why the Civil Rights Movement Grew in the 1950s and 1960s

To what extent was grass roots activism a significant reason to why the Civil Rights Movement Grew in the 1950s and 1960s The civil rights movement grew for a number of reasons during the 1950’s and 1960s. Prior to this select time period America were fighting in the Cold War and many black soldiers battled in the name of ‘freedom’. This was ironic as these black soldiers were fighting for something that they didn’t even have back home. Often Black soldiers talked about the ‘Double V Campaign’; this was referring to victory in the war and victory for civil rights back home in the USA.Many historians believe that world war two planted seeds in the growth of the civil rights movement as it raised the question to black people, in the words of Mohamed Ali; â€Å"Why should they ask me to put on a uniform and go ten thousand miles from home and drop bombs and bullets on brown people in Vietnam while so-called Negro people in Louisville are treated like dogs and denied simple human rights? † A Philip Randolph played a key role in the early civil rights movement as he called for an executive order to stop job discrimination in the defence industry.President FDR eventually issued executive order 8802 stating an end to discrimaination the employment of workers in the defence industries and in government. This proved effective in the growth of civil rights movement as it was one of the first pieces of success blacks achieved and this increase momentum, hope and motivation for blacks in their bid for civil rights. Other factors that influenced effected the growth of the civil rights movement included the increase in media awareness which helped mobilise support from all quarters of the USA.The support they gained due to different methods of black leaders, the shift in president’s attitudes and the Supreme Court, and the momentum gained through small victories which inspired the likes of Rosa Parks. Grass roots activism managed to gain momentum and maintain belief amongst black Americans which proved vital in the growth of the civil rights movement in the 1950’s and 1960’s. The fact that prejudice and discrimination still existed meant that the fight had to continue and relative success resulted in continued motivation.A good example of this is the Montgomery bus boycott, when the Montgomery bus company finally decided to desegregate a year boycott began, Martin Luther King and black protesters didn’t settle at that, they tried to desegregate the rest of the still segregated bus companies in Alabama. In one sense a legal victory was gained here in the desegregation of the bus company however in another sense a moral victory was gained as it showed the economic power black Americans had if they united together.In addition, because Blacks wanted to continue to desegregate bus companies in other cities this shows Black Americans were trying to grow the CRM rather than just being contempt after one city was desegregated. Thus proving the CRM was growing due to grass roots activism and small successes maintaining belief amongst blacks. The growth of the CRM was also due to the variety of opinions, tactics and views of different black leaders and organisations. A wide range of beliefs were covered so most black Americans had a leader that suited their own beliefs.For example MLK and the SCLC supported non- violent protests, such as the Montgomery Bus Boycott, The Freedom Rides and The Sit-Ins. These methods appealed to many blacks and whites too who supported non-violent methods and the whole concept of MLK ideology. However blacks who did not support peaceful protests could support the Black Panther party instead lead by Heuy Newton and Bobby Searle. This organisation supported much more aggressive actions and believed in self-defence and retaliations against white mobs and policemen. Huey Newton’s main aim was: An immediate end to police brutality and the murder of black people.The Black panthers appealed to the new generation of blacks and those who had generally a more aggressive view on the situation. The fact that different parties existed meant that the CRM had more supporters as it has supporters from both violent and non-violent sides; this in the big picture benefited the cause for CRM and helped it grow. The change in president’s actions and beliefs also helped the growth of the CRM. Presidents such as Truman and Eisenhower began to take action overruling states inactions to ignore the federal government, thus effectively aiding blacks bid for civil rights.A good example showing how president’s attitudes were changing is the little rock nine cases in Arkansas, 1957. When nine black students were disallowed entry into the city high school by governor of Arkansas orders to send state soldiers to stand outside the premises to avoid entry, President Eisenhower felt he had to intervene. He ordered 1000 US soldi ers to protect the black children on their way to school from the mob of angry white parents opposing desegregation in schools.Eisenhower’s actions showed that he was prepared to make drastic action in order for integration amongst blacks and white children in schools. He used his authority to over- rule state laws and this showed that he was for the idea of blacks receiving equal education as whites, therefore adding to the growth of the CRM. Another contributing factor helping the CRM to grow was due to the changes in the Supreme Court that led to opportunities to challenge and change the key features of segregation.In 1896 the Supreme Court issued the ruling ‘separate but equal’ thus legally legitimising racism. However this rule was over turned in 1954 at the Brown vs. Topeka Board Of Education case, meaning that their attitudes had changed and that schools should become desegregated. The reversal of the 1896 ruling, ‘separate but equal’ in this case demonstrated the shift in opinion in the highest court and giving blacks a sense of hope and built momentum as it was their first victory for Civil Rights.One of the most important reasons, if not the most important reason for the growth of the civil rights movement in the 1950’s and 1960’s was the use of the media to raise awareness across the country for the ways blacks were being severely treated. Televisions, newspapers, newspaper photographers all became vital weapons in the Civil Rights Movement. After the brutal murder of Emmett Till in 1955 his mother decided to lay Emmett in an open coffin to allow the public and newspaper photographers to see the severity and brutality of the attacks carried out on Emmett.Over four days thousands of people saw Emmett’s body and thousands more were shocked by the images appearing in magazines and newspapers worldwide. Emmett’s case had a great effect on the civil rights movement; the north became aware of th e horror of discrimination and persecution existing in the south through the use of the media. This case drew massive attention to the cause, encouraging support from both black and white American’s. Therefore the media played a key role in the growth of the Civil Rights Movement as it raised awareness of the problems blacks faced in the 1950’s and 1960’s.In conclusion the growth of the CRM was due to many different contributing factors, however I believe the media played the, most significant role. This was due to the great awareness it caused for blacks as it helped northern Americans and international countries realise the brutality of treatment of blacks in the south. The media also managed to pressurise the government and presidents into making decisions as it brought worldwide attention to causes such as the little rock nine and the freedom rides that embarrassed them into action for the sake of ruining the prestige and reputation of themselves and of the country.The changing attitudes of the president and the supreme court also played a part in the growth of the movement as they gave blacks significant progress to work on and build on. Grass Roots activism also contributed as it built small success as a platform which gained belief and momentum in the movement. The variety of leaders also magnified support from all different types of black Americans which also contributed to the growth of the civil rights movement in 1950’s and 1960’s. By Gavin Rittoo

Autism And Its Effects On Children - 1013 Words

Autism is now becoming a more increasing common disorder that appears before the age of 36 months. There is still no known cause or cure for autism and vaccines have been a great source of controversy as a possible vaccine-autism link. Five decades of research now give parents a wider range of treatments to choose from. Autistic children grow up in their own world, unware of the world around them (Ruffman, Garnham, Rudeiyt, 2001). There have been numerous studies on teaching social skills techniques to autistic children. Absence of their social skills start to show at infancy and the most notable is their inability to relate to people. Difficultly relating socially to other people is a hallmark of autism (Ozonoff Miller, 1995). Students with autism exhibit a multitude of asocial and antisocial characteristic says Kamps (1995). â€Å"Presently we don’t have a medical test that can diagnosis autism. A typical diagnostic evaluation involves a multi-disciplinary team of doctors including a pediatrician, psychologist, speech and language pathologist, and occupational therapist† (Autism Speaks, 2015). Autism is a developmental disability with onset from birth to 3 years old. According to statistics from the CDC released in March 2014, it identified 1 in 68 American children on the autism spectrum (Autism Speaks, 2015). Studies show that autism is four to five times more common in boys than girls. Its presents clinically by impairments in reciprocal social interaction,Show MoreRelatedThe Effects Of Autism On Children With Autism3085 Words   |  13 PagesWhat is autism? To some people it can mean many different things. Autism Spectrum Disorders are a range of intense developmental disorders that can cause problems with an individuals’ thinking, feeling, language, and the ability to relate to others. 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