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Recommended: Essay about elasticity
Aim: To investigate the pattern in the amount by which a hanging piece of elastic stretches when a load force is applied and the amount by which the stretch is reduced when the load is removed.
Aim (in simpler terms): To determine the relationship between the force on a rubber band and its stretch, both during extension and retraction.
Hypothesis: Not required.
Method
1) Hang a piece of elastic on a clamp stand. Ensure the elastic is new.
2) Clamp a ruler using the clamp stand. Ensuring the markings on the ruler is as close to the elastic as possible.
- Draw a diagram
3) Measure the length of the elastic and record the data.
4) Hang masses on the elastic until it reaches it point of irreversible distortion. Take note of this weight; do not hang more than this weight in the experiment.
5) Add a weight of 100N (change appropriately). Wait for a few seconds for the system to “stabilise”. Measure the length of the elastic and record the data. Special care must be taken to ensure that when the mass is added the elastic should not retract.
6) Add more weights, till the total weight is close to its point of irreversible distortion or till there are no more weights.
7) Remove the weights one by one. Wait a couple of seconds for the system to “stabilise”. Measure the length of the elastic and record the data. Ensure that when the mass is removed the elastic should not be allowed to stretch further.
8) Repeat, till there is no more mass on the elastic. Measure the length of the elastic.
Equipment
Elastic Clamp stand
Ruler Different weights or a weight hanger
Variables
Independent: Mass hung on elastic
Dependant: Length that the elastic extends or retracts.
Controlled: Same conditions – thus the behaviour of the elastic is constant
Same equipment
Results
Force (N) Length of elastic (m)
Length that elastic was stretched
During extension During retraction For extension For retraction
0 1 1.2 0 0.2
100 1.5 1.4 0.5 0.4
..
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900 .. ..
1000 .. ..
Note: To find the length that the elastic was stretched. Simple subtract the value “During extension” by the original length of elastic. Then write the result in the column “For extension” for the appropriate weight. Repeat for retraction.
Construct a graph of this data. For ease of data interpretation, graph force on y axis and length that elastic was stretched (that is the column “For extension” and “For retraction) on x axis. Also possible to have intervals of 0.98 N on y axis so that value of mass in grams can be plotted accurately (assuming g=9.8 m/s^2)
Plot the points and draw a smooth curve.
Elastic strain region at small and big end of connecting rod is shown in figure no. 10. The maximum and minimum equivalent strain values are 0.00033975 and 2.1407e-10 respectively. Due to applied pressure there will be change in original dimensions of the connecting rod and hence strain developed can be
On July 16, 2015, James Eagan Holmes was publicly sentenced to 12 life sentences plus 3,318 years. He will serve this sentence as a result of the horrendous Aurora movie theatre massacre he committed. The massacre began when an armed 24 year old, James Holmes, entered a movie theatre in Aurora, Colorado. The massacre began in Theater 9 when Holmes entered wearing ballistic gear, a gas mask, and a helmet and began randomly shooting at the moviegoers. The theatre was showing a midnight show of “The Dark Knight Rises” and ended when James left the theatre and surrendered to the police while his actions left 12 dead and 70 wounded. (O’Neill, 2015)
Residential Furnishings are a wide rang of products and components for the home (Leggett & Platt®,2011). Some of these products include mattress springs, pocketed coils, power foundations, bed frames, ornamental beds, bedding, accessories, carpet cushions. (Leggett & Platt®, 2011).
Step 3: Measure the distance between the clamping bar and the sheet metal edge. Now place and adjust sheet metal edge is such a way that it is parallel to the clamping bar.
tension of the system. Their orientation at the interface varies, depending on the components of
Rigid body motion does not change the length of a vector joining the pair of points inside the body and has no concern with the strain analysis. When external forces are applied on an elastic body, the body undergoes deformation. Due to the elasticity of the body, there comes into play a force which resists the deformation. This force is called stress force. Clearly, the deformation of the body is accompanied by the stress force. In other words, stress and strain occur together in inelastic body. There are two types of elastic deformation: (i) Dilatation and (ii) Shear strain set up in the body in such a way that there is a change only in volume but no change in shape, is called dilatation. In the shear deformation, there is a change in the shape of the body without a change in its volume. Dilatations are further categorized into two kinds: compression, in which volume is reduced; and rarefaction, in which the volume is
First is contractility, the ability to contract or shorten in length. This causes increased tension between the ends of the muscle. Because of contractility, the length of muscles can decrease, increase, or stay the same. Next is extensibility, meaning that muscles have the ability to stretch when pulled. They are able to react positively to a force. Muscles also respond to stimuli like nerve impulses, a characteristic is known as excitability. Stimuli, whether external or internal cause muscles to contract. Last is elasticity. Muscles are said to have elasticity because they return to original size and shape after being extended or
The uncertain nature of chronic illness takes many forms, but all are long-term and cannot be cured. The nature of chronic illness raises hesitation. It can disturb anyone, irrespective of demographics or traditions. It fluctuates lives and generates various inquiries for the patient. Chronic illness few clear features involve: long-lasting; can be managed but not cured; impacts quality of life; and contribute to stress. Chronic illnesses can be enigmatic. They often take considerable time to identify, they are imperceptible and often carry a stigma because there is little sympathetic or social support. Many patients receive inconsistent diagnoses at first and treatments deviate on an individual level. Nevertheless, some circumstances require
Mechanical Engineering 130.2 (2008): 6 - 7. Academic Search Complete. Web. The Web. The Web.
This summer when you go to weigh that fat juicy watermelon, think about the mechanics of how the scale works. The basket is attached to a spring that stretches in response to the weight of the melon or other objects placed in it. The weight of the melon creates a downward force. This causes the spring to stretch and increase its upward force, which equalizes the difference between the two forces. As the spring is stretched, a dial calibrated to the spring registers a weight. When designing scales one needs to take into account that every spring has a different spring constant (k). Bloomfield (1997) defines k as “a measure of the spring’s stiffness. The larger the spring constant-that is, the stiffer the spring-the larger the restoring forces the spring exerts” (p. 82).
Literature Review: Hooke’s law is the process of measuring the elastic limit of a solid object. Hooke’s law is done by getting the force which is mass times gravity equals force. After you calculate the force you must measure how far the cling wrap has stretched form the edge of the table, then you must put it in a fraction, force over the stretch of the cling wrap. Using this method, you should be able to calculate a scientific answer to how strong out of the two cling wraps will be the strongest.
Dr. Mishel’s model describes the concepts as: “stimuli frame”, “cognitive capacities”, and “structure providers”, (Mishel, p.225, 1988). The first concept, stimuli frame, refers to the form, composition and structure of the stimuli that the person perceives and is composed of three components: symptom pattern, event familiarity and event congruency (McEwen & Wills, p.243, 2014). Here we examine the consistency of symptoms, regularity of occurrence and the consistence between what is expected and experienced. According to Mishel, the next two concepts, cognitive capacities and structure providers, influence the stimuli frame. When dealing with illness, there is often times an abundance of information being shared with the ill and those affected. At a certain point, individuals can become overload with information and reach their cognitive capacity, causing a decreased in the amount of information that can be processed, directly effecting the stimuli frame. Next, structure providers, are those ‘pillars’ in an individual’s health journey that provide education to enhance a person’s knowledge base, provide social support (friends, family, or spiritual support) and provide credible authority (knowledgeable, trustworthy healthcare personnel, such as doctors and nurses). Other concepts include appraisal, inference (danger or opportunity), illusion and coping mechanisms”
Health psychology is a relatively new concept rapidly growing and could be defined as the biological and psychological influences affect ones behaviour also bringing in social influences of health and illness (MacDonald, 2013). Biological determinants consider genetic and biological factors of an illness whereas psychological determinants focus on the psychological factors such as why people behave the way they do when dealing with issues such as anxiety and stress. Models such as the Health Belief Model and Locus of Control were developed in attempt to try and explain psychological issues around a chronic illness such as breast cancer (Ogden, 2012). Sociological factors can cause an enormous amount of pressure for one to behave in a certain way for example gender roles in society and religious considerations when dealing with health beliefs. Health Beliefs can be defined as one’s own perception to their own personal health and illness and health behaviours (Ogden, 2012). There are also theories and models used to explain pain and coping with diagnosis such as Moos and Schaefer (1984) Crisis theory and Shontz (1975) cycle of grief people go through when being diagnosed with a serious illness.
The purpose of the experiment is to find out if the number of pulleys affect the force needed to lift a load.
Therefore, the elasticities for each independent variable will need to be computed as follow because this will provide the breakdown of how each variable will represent within