A pendulum is described as a point mass suspended by a string of negligible mass. Typically, it rests in its equilibrium position, but once displaced, the point mass will begin to swing back and forth, about its fixed position. The motion repeats regularly, and the period can be predicted. The model T=2π√(L/g) predicts the period if the pendulum, where L is the length of the string. According to this formula, the amount of displacement plays no role in the length of time an oscillation takes. But how is that possible? Experiments have shown that with any angle of the pendulum less than or equal to 90 degrees from rest position, it in fact holds up. Of course, the pendulum will stop eventually due to outside forces, such as wind resistance and
The restoring force is the force that tends to bring a system back towards equilibrium. It is this force that causes the pendulum bob to slow down on its way away from the resting point, and speed up again on its return trip. Momentum is the force that carries the bob past the equilibrium point, where the restoring force slows it yet again to begin the repeating of the cycle. But what forces are actually acting on the bob itself? There are only two, the force of gravity and the tension force from the string, which acts upwards towards the pivot point of the pendulum. Gravity, of course, is easy to predict. It is a downwards force of 9.81 m/s2 . The tension force is not always constant, as both its magnitude and its direction are constantly changing as the pendulum swings. The direction is always towards the pivot point. When it is at rest, the tension is straight up, but if the bob is to the right, the direction is up and to the left, etc. This image shows the forces acting on a pendulum in motion at 5 different points throughout half an
Why doesn’t it just get stuck in between the two opposing forces at its equilibrium point? To answer that, we need to break one of the forces down into its components. Since the tension force is always perpendicular to the path of motion, we will break down gravity. It consists of one component that is in the direction of the acceleration of the bob (Fgrav-tangent), and another that is directly opposite that of the tension force (Fgrav-perp), as seen in the free- body diagram below. The gravity vector is always the sum of these two vectors.
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As the pendulum swings, both of the component vectors change direction. Fgrav-tangent is always tangent to the arc that is the motion of the pendulum, and Fgrav-perp is always perpendicular to it. Fgrav-tangent acts as the restoring force. As the bob moves to one side of the equilibrium point, Fgrav-tangent points in the opposite direction, slowing the bob until it reverses its direction back to the equilibrium.
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"The Pit and the Pendulum" tells the story of a man victimized by the Spanish
The sad reality of life is that very few people fight oppression. Most talk about independence, but eventually most settle into a life that not even knowing someone else is in charge. In the Pit and the Pendulum, the narrator is ruled by his torturers and in Young Goodman Brown, the narrator is ruled by the Devil. Even though the narrator from the former story was ruled by his torturers, he maintained a more optimistic outlook on his challenges than Brown, who let the Devil take control and lost all hope in the world, proving that optimism is truly the key to success.
Ron Jones, a schoolteacher at a high school in Palo Alto, California created a movement or experiment in which he ended up turning his students into Nazis. This experiment, known as “The Third Wave”, showed that students would respond to extreme discipline by obeying. His hypothesis was that if students preformed in a more disciplined environment, they would begin to comply with the rules and accept them. The independent variable of “The Third Wave” was Mr. Jones, who orchestrated the entire experiment, hanging what he would require the students to do. On the other hand, the students in his class that complied with these rules, were the dependent variable of the experiment.
The swinging arm is a 40 cm long plank that is attached through a metal rod. The uprights in the frame have 5 cm of wood showing above the triangle posts so that a 10 cm metal rod can fit in between them, creating an axel bar. The swinging arm is attached to this rod because there will be a hole in the arm 2 cm from the end, used to slide the arm through the metal rod. (Kalif) The hole should be big enough to allow the swinging arm to move around comfortably, but not too loose. A picture of the swinging arm and metal rod is shown in the photo
Poverty can be a choice or a last resort for many across the globe. The Glass Castle a memoir written by Jeannette Walls, portrays how her family rejected civilization and embraced poverty. I felt Rex Wall’s notion of “sink or swim” (Page 66) portrays the failure and success of having a family. The situation in the Wall’s hopes manifested itself as a Glass Castle, a mysterious glass house the family would hope to build and live in. In order for the family’s dream to succeed, they would have to face many demons on the way. Throughout the book, I protested against some of the choices that were made, but I soon came to an understanding that some people will not change the way they live. I kept on thinking there always a possibility that there is always a cure to a problem, but sometimes there is too little time or understanding on both sides. A common theme that kept on going
The accused in "The Pit and the Pendulum" is obviously being persecuted. For what religion or practice we do not know. For what crime it is not said. The prisoner does not even question his guilt or innocence. The accused in this story, to whom Poe does not give a name, is subjected to three life threatening situations.
The gigantic clock of ebony is another symbolic object in the story. "Its pendulum swung
Before you can observe with a Newtonian reflector telescope, you need to align or collimate its optical parts. The goal of collimation is to insure that both the primary and secondary mirrors as well as the eyepiece are correctly lined up to give clear, sharp views.
This reflective essay will lay emphasis on one of the learning needs I have developed during my two week taster placement in hospital. Reflection helps an individual build upon their skills and makes room for self-criticism as he or she can contemplate upon actions and make relevant changes (Taylor, 2000). I will be applying the “What”, “So what” and “Now what” model of reflection by Driscoll (2000) in this piece of work because it is a more coherent and comprehensible approach to follow when writing a reflective account and is also an easier guide to writing reflections. The learning need I chose to reflect on from my learning plan is having a better understanding of diabetes and the 6 basic medications used in treating the condition since it is a common illness on the ward I am have been allocated on for my first placement. The timescale set for achieving this objective was by the end of my two week placement that is from 27th January to 9th February and I achieved it with the help of a host of factors. In this assignment, all the names of the patients and wards have been omitted and indicated with letters and numbers for confidentiality reasons as stated in the Nursing and Midwifery Council (NMC) code of conduct (2008). The paper will primarily touch on the type 2 diabetes and furthermore on the achievement on my learning need.
Starting off, “The Pit and the Pendulum” was written in a developed way that tells events in the order they occurred in. Otherwise known as the sequence of events, this technique in writing makes a story clear so the reader can understand it without confusion. Using sequence of events greatly impacts the suspense in a story by making the the reader constantly have a burning desire to find out what happens next. There was a lot of uncertainty as to what would happen next to the narrator in “The Pit and the Pendulum,” like as the pendulum was coming closer to him while he was tied down to a large piece of wood. Would he make it out unharmed?
The duration of this short story is spent by the narrator in his torture chamber, alone and afraid. Only rats accompany the narrator in his cell, still offering no comfort to his soul. “They were wild, bold, ravenous- their red eyes glaring upon me as if they waited but for motionless on my part to make me their prey.” The narrator is undoubtedly driven into melancholy during this deplorable period as he struggles to exist alone. Hiding away in his mind, the narrator questions every sound he hears, fearing it will be his last. Conversations of life and death are held inside the mind of the narrator, as the severity of his situation and isolation drive him mad. As the pendulum starts to approach our main character a struggle of the mind occurs. The narrator begins to weigh the positives and negatives of death. “I prayed-I wearied heaven with my prayer for its more speedy descent. I grew frantically mad, and struggled to force my self upward against the sweep of the fearful scimitar. And then I fell suddenly calm, and lay smiling at the glittering death, as a child at some rare bauble. There was another interval of utter insensibility. It was brief, for upon again lapsing into life, I saw that there had been no perceptible descent in the pendulum.” In this selection of text the narrator first wishes for death, asking God to speed the descent of the blade, but
The power of time is crucial in both works, as both narrators are in a race against time to save themselves or others. In the Pit and the Pendulum, the narrator is strapped to a strange contraption, with a deadly pendulum descending towards him. The pendulum was lowering an unhurried rate as it states, " It might have been half an hour, perhaps even an hour, (for in cast my I could take but imperfect note of time) before I again cast my eyes upward. What I then saw confounded and amazed me. The sweep of the pendulum had increased in extent by nearly a yard". Each swing, the narrator was in awe by the motion of the pendulum, he explained, "I fancied that I saw it in motion. In an instant afterward the fancy was confirmed. Its sweep was brief, and of course slow"; however, he was still in fear- his mind was just fascinated by the movement of the pendulum. Not only was the pendulum stressing out the narrator, but also the wall were now closing
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).
Poe, Edgar Allen. “The Pit and the Pendulum.” Poe, Edgar Allan. The Pit and the Pendulum. Mankato, Minn.: Creative Education, 1980. Print