How The Traction Powered Catapult

To fire it, the spoke or arm was forced down, against the tension of twisted ropes or other springs, by a windlass, and then suddenly released. As the sling swung outwards, one end would release, as with a staff-sling, and the projectile would be hurled forward. The arm would then be caught by a padded beam or bed, when it could be winched back again. The Onager is usually the first type of catapult

Crank a novel written by Ellen Hopkins. The events that occur in the story are loosely based off of events that befell the author's daughter, as she tells in her authors not “While this work is fiction, it is loosely based on a very true story- my daughters.” The novel Crank begins with an introduction to the main character Kristina, and Bree her alter ego. Kristina then speaks of her trip to visit her father. While visiting her father she meets a boy named Adam, or “Buddy”, who gets her addicted to drugs and brings out “Bree”. “Bree” is the most self-destructive personality traits of Kristina. Kristina spends the rest of the book either giving into “Bree” or fighting her. In the end, Kristina's’ better side wins when she is impregnated by

The way a Trebuchet works is that a counter weight drops which pulls the arm forward and at the point of takeoff a pin releases the object that is being projected. The counterweight drops using gravity and is attached to the arm causing it to fly up and launch the object. Engineers have had previous experience in this field because of the world wide trebuchet launching competitions. One example of engineers making this trebuchet are the engineers from team NASAW in the Pumpkin Chunkin ' competition. Team NASAW has a trebuchet with a heavy weight and a long arm. There arm and weight start next to each other at the beginning. The weight drops forward and like a whip the arm swings around and fires the pumpkin into the air at insane speeds. They are one of the top competitors in the competition and have proven countless times that the design works wonderfully.

Ensuring the right size of sling is used for the individual and for the hoist.

In this case, the device was a bridge. The bridge must be created to hold large amounts of weight until it broke and could not hold anymore. There were certain requirements for the bridge to be. The most distinct requirements to me included that the bridge must be longer than 46 in, each piece must be shorter than 15 in and the only materials usable were glue and wood.

Trebuchets are most commonly known as medieval weapons used in the Middle Ages. Us three were to build a smaller scale of the trebuchet and had to make sure it hit the target two out of the five times. We had to build a hinged-counter weight type of trebuchet with wheels that could throw a ping pong or golf ball. Through the paper I will explain the history throughout trebuchets and why to have wheels and to have a hinged counter weight on the trebuchet. Also the calculations on the potential energy and velocity are through this report. Our trebuchet met all of the requirements that were to be made and it hit the target three out of the five times. This report will

We needed to fully utilise our knowledge by applying all the basic concepts in physics such as dynamic equilibrium and knowing the stiffness of the materials to build strong miniature bridge using given items to withstand the weight applied.

‘No doubt they’ll soon get well; the shock and the strain / have caused their stammering, disconnected talk,’ writes Siegfried Sassoon in the poem Survivors (1917). Sassoon’s irony in these lines condense a prevalent view of non-combatants during the First World War that the soldiers would recover from their physical injuries and mental illness after the phase of shock had concluded. In the short story Speed the Plough (1923), Mary Butts articulates scepticism towards the idea that Shell Shock will simply pass. Instead of employing the habitual indicators of war, the story showcases Butts’s fixation in avoiding them. Modernist writers, such as Butts, were interested in innovation and experimentation with language to create new forms of expression. The following analysis will explore how the modernist aesthetics shape this passage in order to express the experience of war but avoid recurring to the same language that explicitly evokes it.

With the advent of the Free Trade Agreement in 1989, the duties on hoists between the two countries were phased out over a 10-year period; by 1999 exports and imports of hoists were duty-free. Camar Automotive Hoist (CAH) manufactured surface automotive hoists, a product used by garages, service stations, and other repair shops to lift cars for servicing. In 1999, CAH had sold 1,054 hoists and had sales of $9,708,000 about 60 percent of sale were to the U.S and 40 percent remained to Canada

The physics concepts associated with them are projectile motion, energy, momentum, forces , speeds, and distances. The kinds of catapults all use the same theme of accumulated tension, but acquire that tension in their own way, their own design. The Mangonel catapult for instance, is what most of us think of as the traditional catapult. A large wooden device with four wheels and a spoon that launches fireballs. The Mangonel stores energy much like a spring would, therefore, we use the equation PEspring = 1/2kx^2. The tension in the ropes and arms of the catapult when pulling on its long arm stores potential energy which is transformed into kinetic energy when fired upon.

Power lifting has been around over a millennium and the sport has been adapted in a lot of ways. It can be traced all the way back to the 19th century, but it's absolutely certain that power lifting originated thousands of years before the 19th century. People have practised power lifting throughout time whether it was with a dumbbell or something else that was heavy and posed a challenge. It was a way of displaying someone's strength and it had an element of competitiveness, which is an innate characteristic and always will be part of the human nature. During the pre-industrial revolution power lifting wasn’t that popular and people had no time to do it due to the nature of the jobs, the work that people did wasn’t very advanced as it was

The ski lift moves up the mountain using a cable system passing over towers placed at regular intervals. There are at least two terminals for each ski lifts and sometimes more if the lift is long and has multiple locations for unloading. A bullwheel at each terminal directs the cable around the wheel using pulleys. The bullwheel at the main terminal is called a drive bullwheel and is where the main braking system is located. The bullwheel at the top of the mountain is a return bullwheel. Some ski lifts have the drive bullwheel at the top and the return at the bottom. Between the bullwheels, the cable is tensioned to adjust for changes in temperature, and passenger weight. Hydraulic rams

It is shaped in a way to transfer weight to the towers and anchors with its tension (O'Connor, 1971, p. 372). Cables are made of high strength wires spirally bound to form a rope (O'Connor, 1971, p. 372). Vertical cable suspenders that are fastened to the main cables hang the actual roadway. Stiffening girders and trusses are along the side of the bridge to distribute concentrated loads and help to keep the motion of the bridge at a minimum (Troitsky, 1994, p115).

Since the beginning of recorded history, humans have always had a fascination with flight. Now that we live in a world where boarding an airplane and flying across the country – or even the world - is simply a part of everyday life, the wonder of flight has diminished for many. Despite this, physics students from all around continue to delight in the many physical forces that play a part in keeping these huge objects (like jumbo jets) from falling out of the sky!

This project aim name shows that the speed of lift by dc motor which controlled by armature voltage control method. These project help in our daily life as well as transport residents to different floors, hospital emergency etc. In these project the conversion of electric energy into mechanical energy by the dc motor and these mechanical energy used in the lift. The speed of lift varies by the armature voltage of dc motor. The DC motor which is excited by dc supply using inverter. The dc motor start rotating. The shaft is connected from dc motor to the pulley. so the mechanical energy supply to the pulley and pulley start rotating. So the lift move from upward and downward with help of rotating pulley. Reverse and forward speed of dc motor which is change by the change over switch. the speed increase and decrease or control according to loaded lift by the field regulator. There are some condition we have to maintain as well as rated capacity in weight, maximum load etc.