What is Machine: Definition and 966 Discussions

A machine is a human-made device that uses power to apply forces and control movement to perform an action. Machines can be driven by animals and people, by natural forces such as wind and water, and by chemical, thermal, or electrical power, and include a system of mechanisms that shape the actuator input to achieve a specific application of output forces and movement. They can also include computers and sensors that monitor performance and plan movement, often called mechanical systems.
Renaissance natural philosophers identified six simple machines which were the elementary devices that put a load into motion, and calculated the ratio of output force to input force, known today as mechanical advantage.Modern machines are complex systems that consist of structural elements, mechanisms and control components and include interfaces for convenient use. Examples include: a wide range of vehicles, such as automobiles, boats and airplanes; appliances in the home and office, including computers, building air handling and water handling systems; as well as farm machinery, machine tools and factory automation systems and robots.

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  1. T

    Patent 6,960,975: Antigravity machine

    http://news.nationalgeographic.com/news/2005/11/1111_051111_junk_patent.html
  2. Moni

    Medical How do we learn? And in the same way can a machine learn?

    How do we learn? And in the same way can a machine learn?
  3. D

    Atwood's machine problem - inclined plane

    Thanks for the input!
  4. S

    A simple Atwood's machine (conservation of energy)

    Tipler5 6.P.060.] A simple Atwood's machine uses two masses, m1 and m2 (Figure 6-38). Starting from rest, the speed of the two masses is 5.0 m/s at the end of 3.0 s. At that instant, the kinetic energy of the system is 90 J and each mass has moved a distance of 7.5 m. Determine the values of m1...
  5. M

    Atwood Machine Help: Magnitude of T When M1 Goes to Infinity

    An atwood machine holds two masses at its ends by a massless rope. m1 and m2. Assume the pully is frictionless. What will the magnitude of the tension(T) go to as m1 goes to infinity but m2 stays the same? Im very lost on this problem. I have drawn a free body diagram showing m1g and m2g...
  6. T

    The incredible lifting machine heat loss?

    the incredible lifting machine heat loss?? While stumbling upon this website on the Incredible lifting machine, http://tigre.ucr.edu/dipen/phy11/heat.htm I was wondering what could be some of the reasons why the work down calculated as in mgh does not equal to the work done under the pv...
  7. F

    Explaining the Concept of a Swinging Atwoods Machine

    hi there i was just wondering could anyone please explain to me the concept behind a "SWINGING ATWOODS MACHINE"-i mean as to why it works that way!"? I really want to know the concept! thanks fahd!
  8. wolram

    Ghost in a Machine? Can it Exist?

    Can there be such a thing ? at work there is a machine that constantly has breakdowns that defy logical explanation, human intervention has been ruled out as there are cameras in the room, and the only way the breakdowns could be man made is by some with tools and access to the machine
  9. T

    Is a perpetual motion machine possible?

    This makes for an interesting mind experiment: http://www.geocities.com/osiris_dionysus1618/ppmmach2.GIF Ultimately the energy comes from the magnetic fields that deminish.
  10. michael879

    A machine that predicts the future

    ok a friend and I came up with this hypothetical situation, and we both believe totally different things about it and I am positive I am right, but I suck at explaining stuff so if anyone can tell me if I am wrong or if I am right, can explain it better than I can? ok here are the two...
  11. O

    Machine vision/computer vision/Image processing forums ?

    anyone know of any forums discussing abt above issues?
  12. J

    Second type perpetual motion machine is existent .

    second type perpetual motion machine is existent . miaobo Let us assume that a system make a circulate of thermodynamics ,if we can approve that entropy will not equal to 0 , so the second law of thermodynamics is wrong ,and the second type perpetual motion machine is existent . The...
  13. F

    Force of recoil on machine gun

    A machine gun fires 60 gram bullets at 360 bullets a minute. If the velocity of the bullets is 600ms^-1 , then what is the average force on the machine gun? How to do this? I have no idea at all. Thanks.
  14. B

    Static Friction of a washing machine

    Here is my problem, A washing machine has a weight of 975 N. It requires a minimum force of 350 N to move it along a tile floor. What is the coefficient of static friction between the washing machine and the tile floor? This is the equation I used to find the coefficient of static friction...
  15. S

    Israeli Scientist Proposes Time Machine Without Exotic Materials

    An Israeli scientist proposed a time machine that does not need exotic materials. See here
  16. I

    Finding the Integral of YdX: A Different Approach

    integration of Dear people of this section. Suppose you have two indepenfent functions x and y and we need to find the integral of the following expression y dx ,and y does not depends upon x, but y varies between 4 and 8 in the interval of integration. ¿ Do you think that the value of the...
  17. R

    Engineering & Constructing a Goldburge Machine

    i am just about to start to engeneer and construct a "goldburge machine". goldburge was a cartoonest who drew complex machines that accomplised an every day task like brushing one's teeth. i would like to hear from anyone who has done something simmilar. please include some success, failures...
  18. D

    How to Implement a Mealy Machine Using JK Flip-Flops and an EPROM?

    I'm given a state diagram and I'm suppose to only use JK FFs (no gates) and an EPROM to implement the state diagram. How do I do this? I have no clue how the eprom and ff will hook up together. If I can figure that out i would have no problem on the eprom programming part. ASAP please...
  19. M

    MATLAB Determine the machine precision in Matlab

    hi, how to determine the machine precision in MATLAB and estimate from this how many bits are used in the mantissa ??
  20. Math Is Hard

    The Mind-reading machine is here at last

    Evo, this might be handy for those difficult clients. :biggrin: http://www.newscientist.com/article.ns?id=dn7304 "It is possible to read someone’s mind by remotely measuring their brain activity, researchers have shown. The technique can even extract information from subjects that they...
  21. G

    Which normal kidney functions should not be replaced by a dialysis machine?

    Which normal kidney functions should not be replaced by a dialysis machine? I've got one answer...but not enough. I don't even know if this is right, but I said blood pressure - patients with heart problems. Can anyone help?
  22. B

    Unusual Discovery in the Woods: An Old Farm Machine

    Today I was walking out in the woods. In many places in the woods around here you can find old stone walls going between the trees. Today by one of these stone walls I found a piece of farm machinery. It was heavily rusted and the rubber tires were flaking. It was ten or fifteen feet wide...
  23. J

    Solving Atwood's Machine: Find Forces & Acceleration

    The machine shown in the figure below can be used to give you a good feel for forces. Assuming a massless, frictionless pulley and a massless string, calculate the magnitude of the acceleration on both bodies and the tension in the string T...
  24. Q

    Time machine possible or impossilble

    Hi everyone, Does anyone of you believe that time machines or timetravel is possible because if it were possible we would already be familiar to one. Because someone would have traveled back in our time whom we could have seen. This has only one explanation that the man who...
  25. D

    Solve the Brain Teasers: Find the Broken Machine

    Three related brain teasers:(I did not see them posted before) There is a mint, let's say the Denver mint. In the mint there are 100 penny making machines. In the problems below there is something wrong with one of the machines. You may produce as many coins as you would like from any of...
  26. S

    Solving the Atwood Machine - Descending Mass

    In the Atwood machine regular 2 mass machine,m1= 2.20kg and m2=7.30kg . The masses of the pulley and string are negligible by comparison. The pulley turns without friction and the string does not stretch. The lighter object is released with a sharp push that sets it into motion at an initial...
  27. E

    Atwood Machine simulation problem

    Need a check on this one please. In an Atwood Machine simulation, m1 is 1.0kg and m2 is 1.1kg. m2 rests on the floor that exerts a normal force, Fn, on m2. when the system is in equalibrium, the tension, T, in the rope at 2.54s is 9.789. If Fn +T- m2*g = 0 then Fn = .991. Is this correct?
  28. pelastration

    Anti-gravity machine in your garage

    Sure anti-gravity technology is possible in your garage. Bet for $1,000? and will send you the design. Anyone else interested. Russ? $1,000? Edit by Ivan: Split from https://www.physicsforums.com/showthread.php?t=50321&page=3&pp=15
  29. E

    Design & Build a Bean Bag Launcher Mechanically

    ok, so here it is: "You are to design and construct a bean bag launcher, which will launch a bag filled with dried beans, rice etc. Beanbag launchers will launch their projectiles through the ait in an attemp to have them land in a large coffee tin. The coffee tin will be mounted at the top...
  30. tony873004

    Atwood's machine height problem

    Figure 8-20 http://www.webassign.net/walker/08-20b_alt.gif 14. [Walker2 8.P.025.] For the Atwood's machine shown in Figure 8-20, suppose that m2 has an initial upward speed of v = 0.17 m/s. How high does m2 rise above its initial position before momentarily coming to rest, given that m1 =...
  31. B

    Need help for a bobbin machine

    Here's my main problem to concieve a bobbin machine... I've got an electrical motor which provides a constant rotating vitess.. and i want, in the end, to make the bobbin rotating and assuring a constant tension on the wire. If you have any idea of a simple mechanical system to do that...
  32. S

    Time travel: Scientific Evidence & Theories

    any evidence in time travel guys? id like to hear your theorys, weather scientic ones on wether it exist or how it doesn't exist, and can never exist. I personally believe you can never go backwards or forwards into time and live in it. I think if we went faster than light, the light would bend...
  33. T

    What is wrong with a perpetual motion machine?

    I'm just curious, why is it that anye perpetual motion machine that is thought up is discarded immedietly. I know that energy can't be created nor can be destroyed but then again, a few centuries we were absolutely positively sure that the Earth was flat! I mean anything can be wrong, why...
  34. R

    Is Consciousness Present at All Levels of Matter?

    It seems logical to me that consciousnes existing at the molecular level (cells) strongly implies that consciousness exist at all levels of matter, including atomic and subatomic levels
  35. D

    Help with an accelerated atwood's machine

    well, I have tried many ways to get the solution to this problem, but i have two great obstacles: We have atwood's machine with to masses m1 and m2, machine is accelerated upwards with an acceleration a. Find accelerations a1 and a2 for masses m1 and m2 respectively and find the tension...
  36. P

    An Atwood's Machine lab question?

    I have a question...When you take times/measurements in lab, is the %difference supposed to be 40-50%? That seems like a lot to me! My lab partner took the measurements and I am suposed to do the calculations at home, but I am getting huge % difference for all but one of the 5 trials! We are...
  37. N

    Accelerating Atwood's Machine Problem

    I am having difficulty solving Problem 105 of Chapter 4 from Physics for Scientists and Engineers, 4th edition by Paul A. Tipler: The pulley in an Atwood's machine is given an upward acceleration \overrightarrow{a}. Find the acceleration of each mass and the tension in the string that...
  38. M

    Experience Machine: Would You Hook Up?

    Now that I am fully immersed in my Philosophy 110 resitation class every friday, I tend to leave class asking many questions about the discussions we had during class. We were discussing something known as the 'experience machine' and the scenario is as follows. Hypothetically, there is a...
  39. Ivan Seeking

    Can Light Create a Time Machine?

    http://www.physics.uconn.edu/~mallett/ Does anyone know the latest on this?
  40. S

    Design a human-powered machine

    I would like a few ideas about a project of mine. Any help would be greatly appreciated. Design a human-powered machine of some kind. Describe the simple machines used in your design, and tell what each of these machines does. Thanks!
  41. Mk

    Fax Machine Cord: Why 6ft Limit and Why Did Ours Work with 5ft?

    I had a broken fax machine, and we finally found the book, after a month of looking. It said not to use a longer than 6 ft cord... Why? We replaced our 20 ft. with a 5 ft., now it works... hmmm :confused:
  42. E

    Return of the incredible machine: contraptions

    return of the incredible machine: contraptions its a new computer game I am getting today... its a puzzle-type game where you have you design your own "inventions" with objects your given in order to complete the required objective. anyone ever play it? sounds fun.. thought i'd ask you guys...
  43. B

    Convert Xbox to Marshall & Morphy XJX: Time Machine Help

    I need help converting my X-box to the Marsahll & Morphy XJX 24 hour time machine. How do I install the anti gravity chip without a static discharge, I've tried everything from Zykron static discharge units to David Blaine levitation ? Also I need a cheap Quad sync time pulser crystal tx
  44. S

    Atwood machine headache woe

    I was given this problem below in my physics homework. :cry: :yuck: http://www.turbozcar.com/images/knight.Figure.08.40.jpg It wants to know the acceleration of m1. I couldn't figure it out, so the next day a friend in class gave me the answer to be: (2*m_2*g)/(4*m_1+m_2) I took...
  45. E

    How to Solve an Atwood Machine Problem with a Pulley

    Need closure (if not guidance) on this problem also: An Atwood machine consists of two masses, m_1 and m_2, which are connected by a massless inelastic cord that passes over a pulley. If the puley has radius r and moment of inertia I about its axle, determine the acceleration of the masses...
  46. M

    Can you wash sneakers in a washing machine?

    Can u wash sneakers in a washing machine?? I have no clue how to wash shoes. Staying by myself is sooo damn hard... :mad: Is it ok if i just dump them in a washing machine.. some people say i should but others say its a really dumb idea.
  47. B

    Voyager the real Time Machine.

    Voyager the real time machine have we received a message yet? Would you know how to find the massage if it was here? I will return to finish this. http://voyager.jpl.nasa.gov/ spacecraft /goldenrec.html Many Thanks, Dj Blair Styles. 11:11
  48. M

    Can a Gravity Machine Harness Energy in a Frictionless Universe?

    Can one harness gravity mechanically? meaning, in a frictionless universe, can we have an object undergo the forces of gravity, extract energy via a generator (ex. mass falling onto a spring which generates electricity), and reciprocate this while also producing excess energy? Is this possible...
  49. Ivan Seeking

    Can a Machine Invention Lead Us to True AI?

    http://www.stltoday.com/stltoday/news/stories.nsf/News/Science+&+Medicine/E981DA33F2CF718986256E250061FFF6?OpenDocument&Headline=Computer+Creativity+Machine+simulates+the+human+brain
  50. S

    Evaluation items in precision machine

    hi there exis a relationship between dimensional precision and surface roughness as show in the attach file. however, i can't find any other relationship among the others evaluation items. Some example of evaluation items for precision machine are as below: 1)dimensional precision 2)angular...
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