To calculate the acceleration due Essay Example for Free

To calculate the acceleration due Essay Find acceleration due to gravity using ball drop method Amine Alami IB1-3 Lab Report Aim: To calculate the acceleration due to gravity by dropping a ball from a certain distance and recording the time Hypothesis: it is expected that the gravity should be within the same range for each trial Variables: The independent variable = the distance The dependent variable = the time Controlled variables are: the mass of the steel ball the position of the trip plate -the length of the plumb line Equipment: meter stick , half meter stick 1 steel ball. Boss and clamp Electronic Timing Device Release mechanism Plumb bob -trip plate Procedure: A steel ball was inserted between the jaws of the release mechanism The height was adjusted to 1 meter and half a meter, measured from the bottom of the ball to the trip plate The plumb bob was used to locate the centre of the trip plate , to ensure that the ball falls on it and to make sure the release mechanism is perpendicular to the surface of the plate a circuit was made between the release mechanism, the trip plate and the electronic timer. it was configured to start counting as soon as the ball is released and to stop counting when it touched the plate The timer was switched on and RESET was pressed the thumbscrew was pressed to release the ball, it was held straight rather than curved to achieve better results when the ball hits the plate, the spring comes up and the timer stops the time was measured The distance ( independent variable) was varied by moving the clamp upwards or downwards until the distance from the bottom of the ball equals 0. 5 m or 1 m The time was read from the electronic timing device. The same steel ball was used through out the experiment and the plumb bob was kept in the same length through out the trials for each length 20 trials were performed and averaged the distance the ball travels was measured after every trial Data Collection: Table 1. The time it takes the ball to fall 1 meter Trial Displacement(s) iThe time it takes the ball to fall half a meter Trial Displacement(s) i 0. 5mm Time(t). Data Processing and presentation: Average Time in table Percentage uncertainty of gravity 2= (0. 4/9. 95)x100 = 4. 02% Conclusion: The results were in the same range. The firs gravity was very close to the ideal gravity Evaluation: The method used was fairly accurate -but there are many sources of error which may affect the result obtained using it Sources of Error: Air resistance is an error, but it has a slight effect The thumbscrew is clicked twice The thumbscrew wasnt pressed properly The ball might not fall in the centre The clamp may move slightly upwards or downward after every few measurements The same person should press the thumbscrew through out all the experiment The thumbscrew should be pushed with quickly and firmly.

The Life of Frederick Douglass Essay -- Slaves Slavery American Histor

The Life of Frederick Douglass Frederick Douglass brilliantly intelligent and defiant once led a minor insurrection against his masters and escapes his venture alive. Douglass’s career as a militant, uncompromising leader of the American Negro. A fugitive slave who was taught to read by his slave mistress, and who as an ex-slave, became the most famous and articulate rebuke to the monstrous institution of slavery ever to speak or to write in America. In autumn of 1828, Frederick Douglass began his new life as a freeman in the old whaling city of New Bedford, Massachusetts. Ambition, sensitivity, and a high degree of self-consciousness created in the young slave Douglass an unquenchable thirst for freedom and he became what every slave master feared, a smart and uppity Negro who would be content with nothing less than his freedom. A first attempt at escape ended in failure and with time in jail. The second attempt, however, was successful. He fled to New York City, where he married a free Negro woman with whom he moved to New Bedford. He was to date his freedom form September 3, 1838. Douglas relentless exposure of the moral ambiguity of a Christian civilization which was built upon the gross inhumanity of chattel slavery. The White Christian South saw no such moral ambiguity. In fact, they read the Bible as a justification of their way of life, and resented bitterly the charge of northerners that they were un-Christian and immoral because of their support of slavery. They delighted in pointing out that nowhere in scripture is slavery condemned, and they even suggested that slavery was a form of evangelism without which the poor ignorant heirs of Africa would never have heard of the gospel and thus would be unable to know the joys of heaven. Christianity stands against everything which is represented in a culture that makes peace with oppression on this subject there can be neither apology nor compromise. With new found wealth purchased his freedom, a controversial more objected to by certain of the abolitionist who regarded the purchase of liberty as recognition of the legitimacy of bondage. The term of the slave code: a piece of property, a beast of burden, chattel personal. Slavery was a poor school for the human intellect and heart. By the slave code, they are adjudged to be as incompetent to testify against a white man, as... ...ility to manage slaves, to whip, alarm their fears a strike terror. Look word motion mistake accident want of powers all matters for which a slave may be whipped at anytime. Minds had been starved by their cruel masters. Been shut up in mental darkness. To make a contented slave, it is necessary to make a thoughtless one. It is necessary to darken his moral and mental vision and as far as possible, to annihilate the power of reason. He must be able to detect no inconsistencies in slavery; he must be made to feel that slavery is right; and he can be brought to that only when deceases to be a man. The motto which I adopted when I started from slavery was this trusts no man. I saw in every white man an enemy and in almost every colored man cause for distrust. Douglass changed his surname to conceal his identity after escaping slavery in 1838. Life in the city was a turning point in Douglass life. It was there he learned how to read. Douglass later wrote that literacy was his pathway from slavery to freedom. Douglass made an unsuccessful attempt to escape slavery. In 1838 Douglass posing as a freedman sailor successfully escaped to Philadelphia and then to New York.

Esperanza Rising Book Review

Lesson 97 Book Review Esperanza Rising Author: Pam Munoz Ryan (2000) Page Length: 262 Reading Level: 5-7 Genre: Realistic Fiction PLOT SUMMARY: As the story begins, Esperanza Ortega, the daughter of Sixto and Ramona Ortega, rich land owners of the Rancho de Las Rosas, is living in Mexico. Esperanza is six years old and loves spending time with her father who teaches her how to be patient and feel the earth. The story, set right after the end of the Mexican Revolution quickly moves to six years later, on the eve of Esperanza's 13th birthday. Esperanza is anticipating her father's arrival home after a long day at the fields.However, her father does not return and Alfonso, the boss of the field workers, delivers the bad news to Esperanza, her mother, and abuelita that her father has been ambushed and killed by bandits who roam the fields. Many people come to mourn Sixto Ortega's death and give their condolonces for their loss. Esperanza’s two uncles, Tio Luis and Tio Marco come e very day to â€Å"sort† through her father’s paperwork. They bring the news to Esperanza’s mother that they have inherited the land and that she can remain on the ranch only if she agrees to marry Tio Luis. Tio Luis, the local bank director, plans to send Esperanza away to boarding school.After their house burns down to the ground, Ramona takes action to protect herself and her daughter from Tio Luis. Ramona tells Tio Luis that she will marry him to stall him from acting up on his threats. Ramona and Esperanza must leave abuelita behind her ankle when the house burned down. She decides to move to California with Alfonso, Hortensia, and Miguel to find work and a build themselves a better life. Ramona plans to work in the fields helping with the various crops that are grown in California. This offers a better life to Alfonso’s family, but not to Esperanza and her mother.They are leaving a life of prominence, luxury and wealth to live with their former emplo yees in dirt floor cabins. Esperanza has a very hard time dealing with the loss of her father, separation from her grandmother and living in poverty. All the people of the camp know her story and she is ridiculed by some of the girls. She quickly learns to do household chores and to help watch the twins. After her mother becomes ill, Esperanza starts to work so she can pay her mom’s hospital bills and support herself. She works hard and saves her money so that she can bring her abuelita from Mexico to California to join them.Miguel who worked for her family all of his life risks it all to bring her abuelita to California. â€Å"Esperanza Rising,† by Pam Munoz Ryan, tells a story of hope and survival. Through many trials, Esperanza learns about the important things in life. REVIEW: I enjoyed this book very much. It is highly recommended. It is a story of set in the United States during the Great Depression Era and it shows how Esperanza overcame the obstacles of living in a new country despite losing everything. The book is written in English, but several Spanish words are used, which would be good to use in vocabulary development.Pam Munoz Ryan has described this book as being based on her own grandmother’s Esperanza’s life in Mexico and the United States. As a child, her grandmother would talk about her life in the farm camps. These stories inspired the book Esperanza Rising which tells a story of hope and survival. This book has an interesting story line and real-life characters. It brings forth the struggles of Mexican immigrants, racism, difficult and substandard working and living conditions of migrant farm workers in San Joaquin Valley, California and the history of the Great Depression.

Verbal Definition Examples in English Grammar

In traditional grammar, a verbal is a word derived from a  verb  that functions in a sentence as a noun or modifier rather than as a verb. Verbals include infinitives, gerunds (also known as -ing forms), and participles (also known as -ing forms and -en forms). A word group based on a verbal is called a verbal phrase.   Unlike ordinary verbs, verbals are not inflected for person and tense.As an adjective, the term  verbal can mean (1) relating to words (as in verbal irony), (2) spoken rather than written (as in a verbal agreement), or (3) relating to or formed from a verb (as in verbal noun). Types and Examples of Verbals InfinitivesInfinitives are verbals (often preceded by the particle to) that function as nouns, adjectives, or adverbs. We can only learn to love by loving. (Iris Murdoch, The Bell. Viking, 1958)The big thing is to try to be in position when the quarterback throws the ball, and to do that you try to work the angle with the receiver sos you can keep half an eye on the quarterback to see where he let the ball go. (George Plimpton, Paper Lion, 1966) GerundsGerunds are verbals that end in -ing and function as nouns. We can only learn to love by loving. (Iris Murdoch, The Bell. Viking, 1958)From the cookstove came  the soft singing of burning wood  and now and then a throaty bubble rose from a pot of simmering greens. (Richard Wright, Bright and Morning Star, 1939) ParticiplesParticiples are verbals that function as adjectives. I want a good sensible loving child, one to whom I can tell all my most precious candy-making secrets — while I am still alive.† (Roald Dahl, Charlie and the Chocolate Factory. Alfred A. Knopf, 1964)From the cookstove came  the soft  singing  of burning wood  and now and then a throaty bubble rose from a pot of simmering greens. (Richard Wright, Bright and Morning Star, 1939)Our loved ones do not go on forever, in spite of what we may allow ourselves to believe. (Karen Henderson) Usage Notes To write complete sentences, rather than sentence fragments, use verbs or verb phrases, not just verbals. Although a verbal is formed from a verb, it is a part of speech that functions as a noun, adjective, or adverb, not as a verb. (Phyllis Goldenberg, Elaine Epstein, Carol Domblewski, and Martin Lee, Grammar for Writing. Sadlier-Oxford, 2000) Verbals, such as known or swimming or to go, are verb forms that act as adjectives, adverbs, or nouns. A verbal can never serve as a sentences main verb unless it is used with one or more auxiliary verbs (has known, should be swimming). (Laurie G. Kirszner and Stephen R. Mandell, The Concise Wadsworth Handbook, 2nd ed. Thomson Wadsworth, 2008) Because they are derived from verbs, verbals retain some of the abilities of verbs. They can carry objects or take modifiers and complements. At the same time, verbals possess abilities unknown to the typical verb, the abilities of other parts of speech. In this way, verbals may perform the duties of two parts of speech simultaneously.In spite of these new powers, the verbal must give up one of the abilities of its original verb form. No verbal can assume the role of a true verb to express action or condition in a sentence.(Michael Strumpf and Auriel Douglas, The Grammar Bible. Owl Books, 2004)