Lab Report for Atwoods Machine Essay Example

Lab Report for Atwoods Machine Essay Atwood’s Machine Abstract: Ideally, Atwood’s Machine consists of two masses, connected by a massless inelastic string threaded over a frictionless pulley. In this experiment, the dependence of the acceleration on the two masses was investigated. Introduction Atwood’s Machine is represented schematically to the left. Upon inspection, Newton’s Second Law for the system can be derived: For m1: (1) For m2: (2) Solving the (1) for N, followed by substitution into (2), yields the following equation: Rearranging terms and solving for a: (3) By using the photogate and the LoggerPro software, the acceleration of the system may be determined, as well as the dependence on the masses. Procedure A series of masses were placed on either side of the pulley, released from rest and allowed to accelerate a distance of at least 40 cm. The velocity of the system was plotted vs. time, the acceleration determined from the slope of the least-squares line. Initially, the total mass in the system was kept constant, beginning with 200 grams on each side. After each trial, 20 grams from one side was transferred to the other. For the second part of the experiment, the difference between the two masses was kept at a constant 20 grams, adding an equal amount of mass to each side. Apparatus Necessary Equipment: Windows PC, LabPro Interface, Logger Pro software, Vernier Photogate, Super Pulley, mass set, string. All materials provided by the Bemidji State University Department of Physics. We will write a custom essay sample on Lab Report for Atwoods Machine specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Lab Report for Atwoods Machine specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Lab Report for Atwoods Machine specifically for you FOR ONLY $16.38 $13.9/page Hire Writer Analysis As can be seen from the chart to the left, the acceleration is proportional to the difference between the two masses, as predicted from equation (3). Also shown on the chart is the predicted acceleration, calculated from (3); note that they are both proportional, and differ only a constant. Part I| | | Part II| | | a, calc, m/s2| a, exp, m/s2| % Diff| a, calc, m/s2| a, exp, m/s2| % Diff| 0| 0| n/a| 0. 892| 0. 821| 8. 0| 0. 245| 0. 196| 20. 1| 0. 755| 0. 695| 7. 9| 0. 491| 0. 434| 11. 6| 0. 54| 0. 601| 8. 1| 0. 736| 0. 672| 8. 6| 0. 577| 0. 523| 9. 4| 0. 981| 0. 912| 7. 0| 0. 516| 0. 464| 10. 2| For the second part of the experiment, the difference between the two masses was kept constant. As can be seen from the chart to the left, the acceleration is inversely proportional to the total mass of the system, resulting in a hyperbolic curve. This trend was also predicted by equation (3); note, once again, that the calculated acceleration and the experimental value differ by only a constant. Discussion In both sections of the experiment, the curve generated by plotting the aexp against the mass (either the difference or total) differed from the calculated acceleration by a constant value. This value represents the value of gravity at the elevation and latitude of University and any inaccuracies introduced by the ‘massless’ string and ‘frictionless’ pulley. Schematic representation of the Atwood’s Machine: Atwood machine. Wikipedia, The Free Encyclopedia. 24 Sep 2009, 13:18 UTC. 24 Sep 2009 .

The gender stereotype essay

The gender stereotype essay The gender stereotype essay The gender stereotype essayIn the society, there still exist strong gender stereotypes and as a result men and women are often treated unequally. Of course, there are biological differences between men and women, but it is hard to find out whether psychological differences between men and women and the differences of key character traits are innate or reared by the society due to the existing stereotypes and different conditions for men and women.One way in which the society creates different conditions for men and women is the dominance of mens values and morals. According to Stanton (2007), women and men have different moralities and virtues (regardless of the source of these differences), but the society praises only the virtues and moralities common to men, and disregards the virtues of women. Furthermore, Stanton (2007) argues that womens virtues such as benevolence and generosity allow others with more aggressive moralities to take over and to assign a second-class status to wo men.Stanton states that people were created equal and it would be fair to praise both the values of men and women to create a just and prosperous society. This view is in line with feminist ethical arguments that men and women should be praised equally and should have equal rights and respect for their values and beliefs.Another way in which society creates different conditions for men and women is the attitude to family violence. In many communities, a certain degree of power and coercion expressed by a man is viewed as acceptable while women are expected to put up with force and constraint and to value family relationships above all.Friedman (2003) emphasizes that due to such social stereotypes women might not even understand they are being abused and will protect the abuser or refuse to report the abuse. Furthermore, social limitations might make it more difficult for women to break an abusive relationship than to bear family violence. Such state of affairs is unjust and, accordi ng to Friedman (2003), it is important to provide care to women who suffer from family violence in two ways punish the offenders (even if women are against such punishment) and provide the services of professional caregivers to help women reconstruct life and making further life decisions.

How the eye is suited for the purpose of converting visible light into Essay - 1

How the eye is suited for the purpose of converting visible light into neural activity and how visual information is then conveyed to the visual cortex - Essay Example The paper will also highlight some of the challenges the eye faces while it performs its functions. The eye’s first adaptation to its interaction with light is referred to as the papillary light reflex. When responding to different levels of light, the rods and cons work independently but back up each other. This modus operandi espouses the eye’s adaptation to dark light.. While the rods are sensitive to light, they have the tendency to take a significant amount of time to adapt to darkness, in this case the rhodopsin, situated in the photoreceptors take full charge through photo bleaching. On the other hand, the regulation of the eye’s sensitivity eye’ s to light is espoused by the changes in the intracellular calcium ions. In order to adapt to light, the eye first adapts to the background so that it is capable of detecting and distinguishing the background objects; the entire process of adaption to light takes a period of approximately five minutes Whenever light is reflected on a surface or remitted from an object, the eye detects the light that first encounters the cornea; from here, it is then focussed to the lens. The lens in turn functions to vary the focus depending on the distance that exists between the eye and the object. The focal adjustment of the light by the lens is called accommodation. The lens alters its shape depending on the distance of the object; for objects that are distant, it elongates, flattens and pulls out whereas for objects that are close by, it only needs to assume its natural round shape for clear vision. The light first passes through the space between the cornea and the lens that is filled with fluid called aqueous humour. It consequently goes through the t pupil ‘s circular aperture that is surrounded by the iris diaphragm muscles prior to going through the lens (Jones, et al 2004). However, the quantity of light that passes through the pupil is determined by the pupil’s diameter a nd still goes ahead to be