Simple machines are used to let people do certain tasks without using a lot of force. They increase the effect of a certain input distance, speed, or force. They also are able to help change direction. Simple machines consist of levers, pulleys, inclined planes, wedges, screws, wheel and axles, and gears. 1Some of these simple machines combined create compound machines. Some examples of compound machines are a wheel barrow that consists of a wheel and axle and a lever, and a cork screw which has two levers and a screw. 1There is a tendency for compound machines to have a lower efficiencies than simple machines. 1Compound machines however, have greater mechanical advantages than simple machines.
There a two types of mechanical advantage. They are ideal mechanical advantage (IMA) and actual mechanical advantage (AMA). IMA is the input distance divided by the output distance. For inclined planes it is the length of the inclined plane divided by the height of it. AMA is the output force divided by the input force. If the mechanical advantage is greater than 1, they are force multipliers and displacement or speed dividers. If the mechanical advantage is less than 1, the machines are displacement or speed multipliers and force dividers. However, if the mechanical advantage is equal to 1 it is neither a force nor displacement or speed multiplier. When the mechanical advantage is equal to one it is a direction changer.
Efficiency is calculated by dividing the actual mechanical advantage by the ideal mechanical advantage. This will give you a decimal. To get a percent efficiency the decimal must be multiplies by 100. The ideal percentage of efficiency would be 100%. This nevertheless, does not usually happen due to friction in the sy...
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...rings moving along the wheels for either wheel and axles or pulleys, and also the friction from the friction block on the inclined plane. These frictions would obviously lower the efficiencies of the simple machines.
This lab has changed the way I view how college will be like. Most likely I will have to write big papers like this one and will have the same or even less amount of time. It also has shown me that if I force myself to do something in little chunks, I can get it accomplished with less stress than I would if I had done it all in the span of one or two nights. I also have concluded that I should work on my time management and setting different priorities. This lab has hopefully triggered something in my mind that will help with my future projects and papers in which I will space out time and be able to make better decision during the projects.
...icycles, and heavy duty industrial machines all rely on common gears, and without different types of gears we wouldn’t be able to live in the modern society that is today. We know how they've helped us build modern civilization; it'll be exciting to see what they help us accomplish in the future.
...late 17th century, and beginning of the 18th century, transportation was favored by American society so much, the wealthier would hire chauffer’s to take people places. So not only did the motor produce a better and more efficient life style, it also created a huge business industry, as we know it today called, “valeting”. The actual motor worked like this. “Two cups filled with mercury would contain a magnet and a wire with one being fixed and the other free to move. Whenever a current was passed through the wire, the free moving magnet or wire would revolve around its fixed partner due to the electromagnet forces being produced.” (History of Innovation). This first motor was a prime example of the fact that movement could be created by electricity and electricity could be created by friction. This motor was the most useful and applicable invention in the 1800’s.
Corridore, J. (March 2014). Industrial surveys: Industrial machinery. S & P Capital IQ Industry Surveys; 55 Water Street, New York. Retrieved 13th March 2014 from
Throughout the Industrial Revolution in 1780 there were many positive and negative effects that resulted during this time including technologies were improving, machinery that was making travel, luxuries and comfort better, and poor working/ living conditions. The Industrial Revolution was when societies in Europe and America started invent machines, which made manufacturing of products quicker, easier, and cheaper. Before all these machines in factories were created, the economy was all based on farming and peoples abilities to make products to sell. The Industrial Revolution began in Great Britain in the 1780’s and to Western Europe and the United States throughout the 18th Century. It began in Great Britain because there was good weather
...hese complex machines make work easier for us. Simple machines are also useful. For one they make up all complex machines. They also make work more manageable.
So Ishrael made the first move. He flicked the switch of his chainsaw. It took a second for the motor to whir to life, for the gears to shift, for the chain of blades to slowly spin. It picked up speed, revolving around like a wheel of a carriage.
Energy efficient motors use more copper and iron than regular motors. They also consume less energy than regular motors.
This hopefully adds some insight into the use of electric motors, and the principals of them that make these motors work. Such as electromagnetism, binary switches for DC motors, and the selection of a running frequency of a motor through the use of an oscillator.
Over the course of this class I have pieced together many things about my own life that before went unnoticed. I am now able to see things in a bit of a different light. Now that I have been introduced to the realm of psychology I understand some of the reasons for behavior around me. I have learned that there is a reason for most everything and a lot of our behaviors and mental processes can be explained through psychology. Studies have been conducted for many years to try and pinpoint the source of our behavior and it is not something that most people think about every day. Having a better understanding of why we operate the way we do will help me to better understand myself and the others around me.
delivering power instantly to the wheels. By providing high torque at low speeds, they give a feel
The first and biggest positive impact on engineering has been the use of Computer Numerical Control machines (CNC); computers were first introduced to these controls in the early 1970’s. CNC machines typically replace or work in conjunction with some existing manufacturing process. For example before CNC machines a person using a drill press to machine holes would have to do a lot of work for themselves. They would have to place a drill in the drill chuck is secured in the spindle of the drill press. They can then select the desired speed for rotation, and activate the spindle. Then they manually pull on the quill lever to drive the drill into the work piece being machined. As you can see, there are a lot of manual steps required to use a drill press to drill holes. While this way may be acceptable for a small number of holes or parts. However, as quantities grow, so dose the likelihood for fatigue due to the tediousness of the operation. There are also more complicated machining operations that would require a much higher skill level of the person running the machining tool. The CNC machining center can be programmed to perform this operation in a much more automatic fashion. Everything that the drill press operator was doing manually will now be done by the CNC machine, including: placing the drill in the spindle, activating the spindle, positioning the work piece under the drill, machining the hole, and turning off the spindle. CNC works from a source code made on a computer that you just save as a file on your disk and insert it into the machine. The code can be made using two different ways, the first is just understanding the code, and by using the notepad program on you computer, you can just type it right out. This is the easiest way for very simple process, which doesn’t require much code.
Over the course of the semester, I have learned a few things about myself. I have learned that I can be independent, I always knew myself as someone who could do mostly everything on their own. This semester really made me realize how independent I could actually be. Not only have I learned how independent I am I have also realized the importance of time management. With not having a strict class schedule it was a lot different than what I was originally used to. After a few weeks, I learned ways that would work best for me, for example writing down that I needed to get done. I learned that I need to focus on what 's ahead of me to accomplish what I want to succeed in, to manage what needs to be done ahead of time to stay caught up.
Throughout time, machines, no matter how simple or complex, have played a vital role in the development of civilization into the future. In other words, machines have played a part into helping our culture develop into what it has become today. This dates back to the beginning of time when early man used a stick and a fulcrum (rock) to make a simple lever.
trade-offs that might be inefficient. The advantages of such high efficiency must be weighed against the risk involved.
Electrical motors function by converting electrical energy into mechanical energy by using the energy stored in the magnetic field (Sarma, 1981). The mechanical energy (torque) is produced when opposing magnetic fields try to lineup. Therefore, the center line of the north pole of a magnetic field is directly opposite to the centerline of the south pole from another magnetic field (Fitzgerald et al., 1981). The opposing magnetic fields in a motor are generated by two separate concentrically oriented components, the stator and a rotor (Figure 2-5).