Forces in Skeletal Structure of the Arm

Forces in Skeletal Structure of the Arm Bio Mechanics and Kinetics Task 1. Produce a labelled diagram showing the forces involved on the skeletal structure of a human arm as a weight is being held at a particular angle. Your report should use the principle of moments to fully describe all of the forces that are being applied at various points along the forearm through the muscle and tendons. (Assessment criteria 1.1, 1.2, 1.3) Skeletal muscles consist of many parallel fibres wrapped in a flexible sheath along a bone, narrowing at both ends into tendons. Some of the muscles thin into two or three tendons which are known as â€Å"biceps† and â€Å"triceps†. Muscle fibres contract after receiving an electrical signal from the nerve ending attached to them; hence the muscles shorten and a pulling force is sensed by the two bones. Primarily, the main function of the muscles is to pull and not to push. As part of this task, I am going to demonstrate the forces involved on the skeletal structure of the human arm when a weight is being held at a particular angle. The image below shows a free-body diagram illustrating the forces exerted on the forearm bar. According to the Laws of Statics such as Newton’s Law, the net force on the immobile bar must be zero, and the total torque (which will be discussed later) is also zero. Figure 1 Hence the forces acting on the forearm are its weight (W), the weight of the hand (H), force from the bicep muscle (B, which pulls upward the forearm at an angle ÃŽ ±) and the force from the humerus bone (A). The muscular system within the arm generates linear force. Linear force refers to the force that acts in straight line between the origin and the insertion. However the linear force is manifested by the rotational moment which is generated at the joint centre. This is due to the geometrical relationship between the lines of action of the muscles and the joint centre. The maximum force a muscle is able to exert is equivalent to its cross-sectional area, i.e. the legs are capable of lifting heavier load due to having greater cross-sectional area compared to the arms. Therefore the estimated maximum force a muscle can apply is about 7106 dyn/cm2 = 7 x 105 Pa = 102lb/in2. The formula to calculate the moment of force is: For example, if an arm (weighing 7kg) lifts a load of 5kg by 1cm, what is the moment of force applied on the arm? Firstly I will need to find the force of both objects, by using this formula: Where acceleration is 9.8m/s (Earths gravitational field, since it is constant). The force of the object = 5kg X 9.8m/s = 49N The force of the arm = 7kg X 9.8m/s = 68.6N Therefore the moment of a force =49N X 0.01m = 0.49Nm The moment of force of 0.49Nm is applied on the arm. The various joints in the body are known as levers which causes rotations about a fulcrum (axis rotation). This is used to figure out the forces exerted by the muscles such as lifting loads and transfer movement from one point to another. For a lever, the force F required to balance a load of weight (W) is: Where d1 and d2 are the lengths of the lever arms (illustrated in figure 2) If d1 is 5cm and d2 is 35cm, find out the force required to balance the weight of 5kg. Using the above formula: Therefore, a force of 0.71Nm is required to balance the weight of 5kg on the arm. If the load is close to the fulcrum, the mechanical advantage is greater (d12); hence if it is far away then it is smaller (d2> d1). Therefore the mechanical advantage may increase or decrease depending on the distances from the fulcrum. We can also measure torque (any point of the fulcrum), which refers to the force applied over a distance (lever arm) that causes rotations of the fulcrum. The torque is dependent on three variables: amount of force, angle of application of force and the length of the moment arm/ R. As mentioned above in figure 1, the total torque is equal to zero;. The following formula is used to calculate Torque Ï„: Where F is the force (0.71Nm), R is the distance from the location force is applied to the joint (moment arm) (35cm) à Ã‚ ´ is the angle between the force and the radial line I will now find out the torque for the same question, if the angle is 20 °; This links in with the above statement of the total torque being equal to zero. I am now going to discuss about the elbow and the forces applied to it. There are many properties which can be used to calculate the forces of the biceps: the angle of the elbow; the length of the upper and lower arm bone; and the distance from the bone to the location the muscle is attached to. I will now use this formula to find out the force exerted by the biceps (equilibrium) in holding the object, which is the sum of the clockwise moments about any points, equals the sum of the anticlockwise moments about the same point: Taking 5cm from bone to the biceps attachment; The force exerted by the biceps holding the object is 891.8N. Similarly, we can also measure the tension of the bicep/arm holding the object. The image below shows an arm being held out and elevated from the shoulder by the deltoid muscle. The forces can be measured the taking the sum of the torques (of the shoulder joint, the tension (T) can be calculated: Where W1 is the weight of the arm, W 2 is the weight of the object Using the above question; if = 20; the weight of the arm (W1) is 68.6N and the weight of the object (W2) is 49N, then calculate T: = 113.96N Therefore the force needed to hold up the bicep/arm at 20, is 113.96N. Task 2. A) You must complete the energy changes/momentum worksheet. Assessment criteria 2.3,2.4 See attachments b) You must produce a report that describes the equations of motion needed to calculate the range and maximum height that a projectile thrown by a human can achieve. This report must include examples of both the range equation and maximum height equation. You could use a sports person throwing a ball as an example. A projectile is any object that has been thrown or shot by a human (measures projectile motion). Projectiles are affected by two factors: gravity (Horizontal motion) and air resistance (vertical motion which is the force of gravity pulling down the object). As part of this task I am going to carry out various calculations to find out the range and maximum height that a golf ball can achieve when a golf player hits the ball. A golfer hits a ball so that it moves off with a speed of 37m/s at an angle of 45. I am going to calculate how far the ball goes; the maximum height it will reach; and how long it takes for the ball to get there. Firstly, I am going to use the following formula to calculate how far the ball travels; Where R is the range/resultant (how far the ball goes), V0 is the initial velocity of the ball speed (37m/s) g is the gravity (9.8m/s) also can be used as (a) since it is constant à Ã‚ ´ is angle of the ball (45 °) Therefore; Hence, when a ball is hit with a speed of 37m/s at 45 °, the ball will go far as 139.7m. Secondly, I will calculate the maximum projectile height (how high a ball will go) by using the following method; Where Ymax is the maximum projectile height that the ball will go The maximum projectile height that a ball will reach is 34.9m. The final calculation that I am going to carry out is the flight time so that I can find out how long it takes for the ball to get there. I will use the following method; Where Tflight is the time flight of how long it takes for the ball to reach there. The flight time for the ball to get there is 5.3s. Using the same question, I now want to find out how far the ball travels horizontally from A to C and the time that the ball is in the air, ignoring any air resistance and taking g = 10ms-2. Firstly, I will calculate the time that the ball is in the air for, by using the following formula; I need to find out the vertical motion from A to B first = 90 ° 45 ° = 45 ° Formula; Where v is the final velocity (0 since it is moving horizontally), u is the initial velocity (37m/s x cos 45) is 26.16m/s a is the acceleration (10m/s) t is the time Therefore; , so the time it takes from A to C is twice this I will now look at the horizontal motion from A to C. Horizontal component of velocity. This is constant during motion. Horizontal distance = horizontal velocity X time of flight Therefore the horizontal distance the ball travels from A to C is 136.8m. Task 3. You must produce a report showing how the variation of blood pressure affects the human body. Your report must include calculations to determine pressure based on area or density values. Assessment criteria 3.1,3.2 Bernoulli’s Principles explains that flowing blood has different speeds and therefore different kinetic energies (KE) at different parts of the arteries. It determines the relationships between the pressure, density and velocity at every point in a fluid. Bernoulli’s Principle was discovered by a Swiss physicist called Daniel Bernoulli in 1738. He has demonstrated that as the velocity of fluid flow increases, its pressure decreases. Flowing blood has mass and velocity. The mean velocity squared (V2) is equal to the kinetic energy. The image below demonstrates the variance of kinetic energy at different parts of the vessels and also shows the theory of Bernoulli’s Principle: Therefore KE =  ½ mV2. As we know from above that blood flows inside arteries, were pressure is applied laterally against the walls of the vessel which is known as the potential or pressure energy (PE). The total energy (E) of the blood pressure within the artery is the sum of the kinetic and potential energies (presuming there are no gravitational effects): E = KE + PE(where KE ∠ V2)à ¢Ã¢â€š ¬Ã†â€™ Therefore,E ∠ V2 + PE Similarly, Bernoulli’s Principle states that the sum of the Pressure (P), the kinetic energy per unit volume (1/2 pv2), and the gravitational potential energy per unit volume (pgy) has the same value at all points along a streamline. The equation below shows this: There are two vital theories that follow from this relationship, which includes: Blood flow driven by the variation in total energy between two points. Normally, pressure is considered as the driving force for blood flow but in fact it is the total energy that moves flow between two areas (i.e. longitudinally along a blood vessel or across a heart valve). KE is relatively low in most of the cardiovascular system; hence PE difference is the energy that drives flow. Similarly, is KE is high then the total energy increases which explains the flow across the aortic valve during cardiac ejection. This is because, as KE drives blood across the valve at a very high velocity, it ensures that the total energy (E) in the blood crossing the valve is higher than the total energy of the blood more distal in the aorta. KE and PE can be converted to maintain the total energy unchanged, which is the basis of Bernoulli’s Principle. This principle is basically about the blood vessel that is suddenly narrowed then returned to its normal diameter. The velocity increases as the diameter decreases in narrowed region (stenosis). Blood flow (F) is the mean velocity (V) and the vessel cross-sectional area (A) is directly related to diameter (D) (or radius, r2); hence V ∠ 1/D2. If the diameter is reduced by half in the region of the stenosis, the velocity increases 4-fold, due to KE ∠ V2, hence KE increases 16-fold. The image below demonstrates this: The image above shows the total energy being conserved within the stenosis (E actually decreases because of resistance), then the 16-fold increase in KE will decrease in PE. Once past the narrowed segment, KE will go back to its pre-stenosis value as the post-stenosis diameter is the equal to the pre-stenosis diameter, hence flow is conserved. Due to the resistance of the stenosis and turbulence, the port stenosis PE and E will both fall. Therefore, blood flowing at greater velocities has greater ratio of KE to PE. As we know, blood pressure is the force of fluid against the walls of the arteries, similar to how water exerts the pressure inside aplastic pipe. It is made up of systolic and diastolic pressure. Systolic pressure is the top figure and relates to when the heart is contracting (beating) and forcing blood through the arteries and transporting it to the rest of the body i.e. brain, kidneys etc. The normal values for systolic pressure is from 120-139mmHg. Diastolic pressure is the bottom figure and is linked to when the heart is relaxing. The normal value for diastolic pressure is between 80-89mmHg. Hence, if the values exceed these numbers, then it is considered to be hypertension. Hypertension is high blood pressure which is caused by the increased force of blood flowing through the arteries. Healthy arteries are flexible, strong and elastic. Inner lining of the arteries are smooth allowing the blood to flow freely, supplying important organs and tissues with adequate nutrients andoxygen. Hypertension can gradually lead to wide range of problems such as damaging the cell’s inner lining of the arteries; hence releasing a cascade of events that causes the artery wallsthick and stiff (called arteriosclerosis), or hardening of the arteries. Similarly, the fats from the diet enter the bloodstream and passes through the damaged cells. However, plaques are prone to building up in the arteries leading to atherosclerosis. These changes lead to blocking blood flow to the heart, kidneys, brain, arms and leg. Heart: it causes coronary artery disease, which is narrowing of the arteries that doesn’t allow blood to flow freely through the arteries. Leading to chest pain, heart attack (myocardial infarction)or irregular heart rhythms (arrhythmias). Hypertension can also cause enlarged left heart as the pressure forces the heart to work harder than necessary. Similarly, overtime the strain on the heart leads to the heart muscles to weaken and work less effectively causing the heart to wear out and fail. Brain: hypertension can cause mini-strokes (Transient ischemic attack (TIA)), which a temporary disruption of blood supply to the brain caused by blood clot or atherosclerosis. Similarly, it can lead to the full-blown stroke which happens when part of the brain is deprived of oxygen and nutrients leading brain cells to die. Uncontrolled hypertension damages and weakens the brains blood vessels, causing to narrow, rupture or leak. Narrowing and blockage of the brains blood vessels can also lead to Dementia and mild cognitive impairment. Kidneys: filters excess fluid and waste from the blood via a process that depends on healthy blood vessels. Hypertension can damage both the blood vessels and leading to the kidneys. This leads to various kidney diseases, failure and scarring of the kidney. Eyes:- Blood vessels supplies blood to the eyes; hence high blood pressure can damage the blood vessel (retinopathy) Reference http://www.bhf.org.uk/heart-health/conditions/high-blood-pressure/blood-pressure-research.aspx 22nd October 2013 http://www.bhf.org.uk/heart-health/conditions/high-blood-pressure.aspx 22nd October 2013 http://www.webmd.boots.com/hypertension-high-blood-pressure/guide/diastolic-systolic 24th October 2013 http://edition.cnn.com/HEALTH/library/high-blood-pressure/HI00062.html 24th October 2013 http://amazinghumanbody-prakash.blogspot.co.uk/2009/10/skeletal-system.html 25th October 2013 http://www.bbc.co.uk/science/humanbody/body/factfiles/armandshoulder/arm_and_hand.shtml 26th October 2013 http://www.cvphysiology.com/Hemodynamics/H012.htm 26th October 2013 http://www.bu.edu/gk12/kai/Lesson%206/BP_Back.pdf 27th October 2013 http://mysite.verizon.net/fvozzo/genphys/lecture.html 27th October 2013 http://muscle.ucsd.edu/musintro/ma.shtml 29th October 2013 http://www.as.wvu.edu/~rbrundage/chapter8b/sld015.htm 29th October 2013 http://www.answers.com/topic/projectile-motion 30th October 2013 http://www.wired.com/wiredscience/2011/10/optimizing-a-basketball-shot/ 1st November 2013 http://demoweb.physics.ucla.edu/node/28 25th November 2013 http://www.medicalphysics.org/apps/medicalphysicsedit/WebPOTB.pdf 25th November 2013 http://physics.eou.edu/opensource/physics/projectile.pdf 27th November 2013 http://www.google.co.uk/url?sa=trct=jq=esrc=ssource=webcd=14ved=0CG8QFjANurl=http%3A%2F%2Fwww.wooster.edu%2F~%2Fmedia%2Ffiles%2Facademics%2Fresearch%2Fhhmi%2Fresources%2Flectures%2Fhuman-arm-goniometer.ashxei=bnakUuzDC6yg7AbX5oGYCQusg=AFQjCNFMTH1EmPzRvKvptZu4R7_XUpFKPwbvm=bv.57752919,d.ZGU 28TH November 2013 Dobson et al. (2002). ‘ Collin advanced – Physics’. Collins eduction : London Rounce, J.F and Lowe, T.L. (1992). ‘Calculations for A level Physic’. Second edition. Stanley Thornes: Britain Boutal et al. (2008). ‘AS-Level physics – exam board’. Coordination group publications CGP: Newcastle Tsokos, KA. (2008). ‘Physics for the IB Diploma’. Fifth edition. Cambridge university press: united kingdom Johnson et al. (2000). ‘Advanced physics for you’. Nelson Thornes: united kingdom

Marketing plan description

What major demographic developments and trends pose opportunities or threats to firms doing business in this product category? Cutter Automotive can expect the following demographic changes to affect them (Ferron J) Reduction in number of customers who buy on impulse The customer base is decreasingly responsive to novelty , change and variety The customer of the present generation is looking for quality , durability and appropriateness There is an increased trade off between time and convenience to get a good buy. The customer base is looking for the best bargain and is not loyal like the earlier generations There is noticed increased loyalty to brands but not over all the products of that brand. The generation of today is spending more time and money at home There is noticed an increased focus on purchases with the future in mind. The customer is also information savvy and can be expected to know the in and out of the products and offers. The above list of changes can be an opportunity or a threat to the firm depending on the decisions that it implements. The firm can tailor its future business plan to take into account the changing mindset of the customer and make the shift in demographics an opportunity not a threat. The customer of the future is looking for the best bargain and is working more often than not on a budget.    The families of tomorrow are also 2 or more car families and if the dealership can convert sale into loyalty, the benefits could accrue in the form of future business. Due to the advent of the information age, the dealer can no longer rely on smooth talking sales personnel but on delivery of facts and offers. The dealership also needs to keep in mind the increase in online booking especially since the cars are mass made. What broad cultural or sub cultural patterns affect the public’s attitude towards the firms and/or products of the firms doing business in this product category? There exists a general perception amongst the public that car dealerships can be equated to words like â€Å"fleecing†. There also exists a perception like the dealership sells old cars made to look like new, over charges for accessories, the discounts advertised are not really discounts; customer is leeched if not careful. In a study conducted by HarrisInteractive for a project entitled Automotive Retailing today in 2004 , it was found that negative perceptions about what it is like to buy a car from a dealership is very different from actual experiences . These are sentiments handed down from generation to generation or person to person. A sample few may have had a bad experience or the dealership attitude may have been in the projected negative mould, and this has established itself as the image associated with a car dealership. This perhaps stems from the time when manufacturers were few , the car dealer was the all knowing and important person in control of sales , there was a monopoly of sorts and the product was an expensive investment. This situation may have given rise to the advice â€Å" Be careful while buying a car from the dealership , they will try to fleece you†. The study also found that people did not trust car dealerships in general but trusted â€Å"their† dealership, people held the perception that buying a car from the dealer is always a bad experience but personally never had one , women are not treated as well as men in an auto dealership. Cited Ferron ,   J., an

Thoughts on Computers Essay Topics in Step by Step Order

Thoughts on Computers Essay Topics in Step by Step Order It's not a secret that the web isn't as nice and useful as you may think. Thus, it's the very best choice to purchase from the stores immediately. Computers are an essential part of normal life. Computers and their technology give us access to a large volume of information which makes it simpler to be a thriving student. To choose which subject you're likely to discuss, it's essential to see the complete collection of good persuasive speech topics from the special area of study. Take notes concerning all possible topics you may consider. Students often stress about trying to find utile persuasive essay tips and searching for ideas due to the fact that they feel it's an uphill job, but the secret is to understand the essence and generate a suitable outline first by planning for it correctly. Many students think that it is a waste of time. The cost of an essay depends upon the total amount of effort the writer has to exert. If you order from us, you can find a draft of your paper to be sure your writer is heading in the correct direction. The writers can manage any subject of your choice. Our writers only do what you desire. You just have to order a great essay from experts with the greatest academic degrees in a number of fields. Then devote another section to spell out how each one among them is unique. Give some intriguing facts. Do not neglect to develop an efficient outline to be successful! A Startling Fact about Computers Essay Topics Uncovered There's no worry to get hold of our services to assist you with an essay on computers. Our computers and internet topic suggestions can be utilised to create unique suggestions for your own research papers. Totally free Computers essay samples are offered on FreeEssayHelp with no payment or registration. There are millions of essay about computers topics you ma y write on, but the problem arises when you've got to opt for any one of them which isn't just the greatest but informative too. Always remember a great persuasive essay ought to be persuasive. It's possible to restate your thesis statement and point out a number of the arguments used over the whole essay that backs it up. On the opposing side, acquiring a list of good persuasive essay topics is inadequate. So locating the most effective persuasive essay topics is important. You may continue to keep your argumentative essays for your upcoming job portfolio in case they're highly graded. Our qualified academic experts will help you to find an ideal persuasive essay topic according to all of your requirements and compose a custom-tailored model answer. Therefore, many students and employees decide to obtain cheap essay rather than writing it themselves. The absolute most comfortable kind of writing which you may find among our computer essay samples is paper about advantages and pitfalls. You may also order a fully written compare and contrast essay and alleviate the quantity of work you must do. Another good idea is to receive some absolutely free essay examples of different sorts and on various subjects to find a general idea of the way in which a thriving debatable paper looks. You can begin with the form of topic you pick for your compare and contrast essay. The 30-Second Trick for Computers Essay Topics Computer is a science that needs in-depth comprehension and knowledge. Computers make education easier and quicker. Notebook computers have more recent and updated resources and data when compared with textbooks which can definitely help students understand what they're learning. You should settle on a persuasive essay topic that permits you to present the finest possible case. A student ought to keep in contact with the hottest trends and know which persuasive essay topics are related to sound convincing in regards to defending personal opinions. The essay isn't the simplest task to master. Writing an essay is a tough job, especially if it's the case that you don't understand what things to begin with.

Immigration Is A Big Problem - 1874 Words

Immigration is a big problem in the United States. This paper analysis the people immigrate to U.S. in legal and illegal ways and the cause of it are the safe and economic problems in their home country. The legal immigrants can have most of the same rights as a U.S. citizens and have more opportunities. However, illegal immigrants don t have the same right and also increase the criminal problem in the U.S. . The cost of illegal immigration control is the serious problem for United Stated government. The conclusion is government need to make the immigration process easier and provide them benefit for immigrants. The increase of legal immigration willingness can decrease the illegal immigrants number. There were over 40 million immigrants lived in the United States in 2013 and the population of immigration keeps increasing. For safety and economic problems people leave their home town and move to other countries for a better life. 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