Essay --

The Physics of the Mangonel Catapult Catapults have been used for centuries by many groups of people, including the ancient Greeks, Romans, and Chinese. Catapults have had an assortment of purposes, but the most commonly purpose was to launch a projectile to destroy castles and soldiers. There were three main types of catapults; Ballista, Mangonel, and the Trebuchet. The mangonel was the most popular one. Different levels of torsion in the rope of the mangonel catapult decided how far a projectile was going to travel. Also the different objects that were used as projectiles and there masses also had a big role in the distance they would reach. If physics weren’t applied to building a catapult the catapult itself wouldn’t function correctly, therefore physics is what brings these machines to life. Though catapults are no longer used today in combat or any other use they still have a great history behind them. The mangonel catapult was the most well known one. The way this catapult functioned was by pulling back on a wooden stick that was connected to a wooden arm with a bucket, would pull that arm back. Pulling back on the wooden stick would cause the potential energy of the catapult to be stored in the torsion of the ropes of the wooden arm. When the wooden stick was let go the arm wood immediately return to its original position of 90 degrees where a wooden block would stop its impact and would then launch the projectile. When the arm reaches back to its original position it forms an arc with a radius equal to the arm length. Therefore the potential energy is transferred into rotational kinetic energy. Decreasing the torsion in the ropes of the wooden arm would make the projectile travel at a slower velocity. To calculate the t... ...ed. Another disadvantage is that the mangonel was not that accurate. The range was determined by the mass of the object and the strength of the catapult itself. Catapults were the weapon of the medieval times. The catapults had many purposes especially during war. Physics were applied to the building of a catapult without it the catapult wouldn’t function. The different levels of torsion would affect the catapults ability to launch a projectile higher into the sky, further, and give it a faster velocity. Also the different masses of objects used as the projectile were also accounted for those things. Though the mangonel catapult was a great catapult it also lacked some abilities, such as having poor accuracy and it wouldn’t work in wet conditions or cold weather like in the rain. Overall the mangonel is a great catapult and always has been over the past centuries.

Preventing Obesity to Prevent Diabetes Essay

Diabetes is an ailment in which the human body refuses to produce or make appropriate use of insulin. Insulin happens to be a hormone which is required to convert starches, sugar and other foods into energy for everyday life. Although the causes of diabetes remain as a mystery, many medical experts believe that genetics and poor lifestyle choices – e g. lack of exercise – that result in obesity may very well be responsible for the disease (â€Å"Diabetes†). Of course, when insulin is prevented from converting starches, sugar and other foods into energy, metaphorically speaking, it is as though a person has lost a leg or an arm, especially when the individual is just a child. At a growing stage, children’s bodies should be effectively converting foods into energy, so that they can develop into mentally and physically healthy people – the future of our world. Besides, all kinds of preventable abnormalities are equally harmful. Imagine the effect on a child’s self-esteem, not only when he or she is called ‘fat and clumsy’ by his or her slim and fit classmates, but also when he or she must undergo treatment for diabetes at the time that his or her classmates are at play. The International Obesity TaskForce reports that almost 1. 7 billion people around the world â€Å"are at a heightened risk of weight-related, non-communicable diseases such as type 2 diabetes (â€Å"Diabetes and Obesity†). Moreover, the International Diabetes Federation has predicted that by 2025, the number of people with diabetes, including children, may reach at least 333 million (â€Å"Diabetes and Obesity†)! Insulin is responsible for taking the sugar from the human blood to the human cells. If glucose starts to build up in the blood rather than going to the cells, two problems may result: (1) The cells could become energy-starved; and (2) Eventually the high blood glucose level may start to hurt the eyes, nerves, kidneys or heart (â€Å"Diabetes†). Unsurprisingly, such suffering is very difficult for a child to bear. Fortunately, however, individuals that are suffering from diabetes may seek their doctors’ advice apart from making changes in their lifestyles to prevent these problems. If the person suffering from diabetes is overweight, the doctor may recommend weight loss. Effective weight reduction plans, in addition to â€Å"increased physical activity,† may help the diabetic person to a large extent (â€Å"Diabetes and Lifestyle†). According to a report published by the World Health Organization, â€Å"more than 22 million children under five years old are obese or overweight, and more than 17 million of them are in developing countries. Each of these children is at increased risk of developing type 2 diabetes†¦ (â€Å"Fight Childhood Obesity to Help Prevent Diabetes†). † Obviously, this is expert opinion on the relationship between obesity and diabetes. If a child is watching television or playing video games most of the time and becoming obese, his or her parents should be sending the child to run around with his or her friends in a park instead. Seeing that children in developing countries are also suffering from obesity, and therefore the risk of developing diabetes, it is clear that obesity may be inherited to boot. Children of poor families do not get enough to eat in any case. What is more, if and when they develop diabetes, their families cannot afford to get them treated. But, even if a child’s parents can afford to get him or her treated, medical treatment is more expensive than prevention of obesity. The California Department of Education reports that â€Å"[o]verweight children and youths are more prone to developing serious health problems now and in the future (â€Å"Final Task Force Recommendations†). After all, this is the age of McDonald’s and Burger King, which makes it even more important to prevent obesity in children as well as adults. It is easy to buy a hamburger from Wendy’s on the way back from school – both for the mom and the child. However, the cost of sickness is much higher than the convenience of a drive through fast food restaurant. Everybody wants children to flourish and help the nation and the entire world to prosper as well. Besides, all health experts are of one voice as far as the relationship between diabetes and obesity is concerned. The fact that most people diagnosed with diabetes are obese, be they adults or children – makes it necessary to check obesity. It has been timelessly stated: we are what we eat. Therefore, it is best for both children and adults to be nourished by healthy foods. Fruits and vegetables are always considered superior to fats and hamburgers. Exercise and keeping fit are always better than excess weight. Nobody has ever doubted that human beings love to eat good food. At the same time, however, it must be borne in mind that obesity may turn into a severe disorder. It may negatively affect the individual’s mental state, by lowering his or her self-esteem. What is more, a child that is fed on McDonald’s five times a week may eventually become incapable of studying in school if diabetes ends up hurting his or her eyes. Mothers too may be rendered helpless as far as housework is concerned. Undoubtedly, therefore, in the case of diabetes, it must be timelessly stated: obesity prevention is better than cure.

The Rise in the Number of Girls Suffering from Anorexia...

Statistics are often a bit of a hazard, but when it comes to those concerning an illness characterised by discretion, dishonour and deception, even that is an understatement. Statistics show a 60% rise in the number of young girls admitted to hospital with anorexia in England and disturbingly still rising. The mythology encompassing anorexia is a self-inflicted condition brought on by narcissism. Narcissism is a misinterpretation of what is, in reality, a life threatening disease whose cause remains obscure, whose treatment is inaccurate and whose classification is random. Anorexia kills more of its sufferers than any other illness. And it is vital we feed our society with greater knowledge of this critical disease to ensure that it doesn’t eat away the security and sustainability of our future generations. Anorexia nervosa is an illness which predominately attacks teenage girls or women in their early adult years. When they look into a mirror, they don’t see athin body; they see a revoltingly overweight body. Anorexia is a mental illness and must be treated. It is also a physical illness, an illness similar to starvation. Anorexic young women may feel dizzy and tired constantly, may lack emotional warmth, develop a gloomy personality, the everlasting symptoms of this bizarre suffering are never-ending. Though its symptoms are endless, but its cause? Veiled.Some claim that the media has a vigorous affluence on society, other prevail that it is down to free will of theShow MoreRelatedAnorexia Nervosa And Its Effects On Society1514 Words   |  7 PagesMillions of people are currently suffering from Anorexia. Anorexia Nervosa is an eating disorder in which people suffering drastically restrict food intake due to an intense fear of gaining weight and a distorted body image. There h as been an unfortunate increase in people suffering from Anorexia Nervosa over the past several decades. 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The public is bombarded daily with images of glamorously thin women in commercials, on billboards, in movies in magazines and etc?According to Melanie Katzman, a consultant psychologist from New York, the mediaRead MoreEssay about Anorexia Nervosa in Males: An Often Overlooked Minority1831 Words   |  8 PagesFor many the term â€Å"Anorexia† conjures up memories of bone thin, weight obsess ed teenage girls, models, and actresses. However, as the spotlight has been shined on Anorexia bringing this secretive and quiet disorder to a wider public perception, many still suffer in silence: either too ashamed to seek treatment, or because of an improper diagnosis. Over three million men each year are affected by Anorexia. 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