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. Z

    Comp Sci K's Moore Machine: Check it Out!

    Kindly see my attached Moore Machine. Is it correct? Zulfi.
  2. W

    Comp Sci Problem on undecidable problems

    I should first note that I am not a compsci student, and have not learned the "formal" way of using "Languages" to solve such problems. All I have are the two definitions provided above. Thanks! 1b) This is the Halting problem: Undecidable 1c) I have a feeling that this is decidable, since if...
  3. G

    Electrical Options for powering a three phase machine

    The motor from this fine, old and very heavy machine is designed to take UK 3ph, 415V. There are only three connections inside, and the nameplate says it’s wired in star. I have stripped it down and cannot locate the star point. I was hoping to rewire it to delta, and run it with a 1ph/240V to...
  4. L

    Design an Infinite NTM for Any Input String: Turing Machine Question

    Hey guys just wondering if I could get some help with this question. I am having trouble with it as I don't know what the input language is and therefore what inputs to handle. Heres the question: Design an NTM (normalised Turing machine) that never terminates, so that regardless of the input...
  5. UnPetitGarcon

    The acceleration of a massless pulley in a double Atwood machine

    So there is a textbook physics question in which it asks us to calculate the acceleration of pulley B(which is massless). This exact question was posted and asked previously in this thread. However, it didn't discuss my doubt. To be exact, the question I have troubles with is (b)...
  6. F

    Pulling a vacuum on a heat pump with a recovery machine

    I am a student attending an HVAC program at a trade school. Today I recovered refrigerant out of a heat pump in order to debraze the compressor out of the heat pump. My instructor has taught me how to use a recovery machine to recover refrigerant out of an air-conditioner or heat pump before...
  7. W

    Loading OS into a VMWare Machine from a Physical Machine

    Hi All, I have VMWare Workstation Software to use VMs . When I create a machine I am asked to load an OS into the new VM: Is it possible to load the Physical PCs OS into the VM:
  8. V

    The speed of molecules and a machine that sorts them

    Is there any device that can sort the particles of some medium according to the speed at which they move in the medium or something like that? As far as I know, there's a machine that can sort particles by charge through a magnetic field. Is there such a thing for speeds and charged / uncharged...
  9. L

    Resource recommendations for machine learning

    I am planing to change my field (in PhD) and learn Machine Learning to differentiate different phases of strongly correlated matter. I learned Monte Carlo method in my MS and have intermediate level knowledge of topological insulators. Before completely getting into Machine Learning, I want to...
  10. ArnavVarshney

    How to calculate acceleration in this Atwood's Machine?

    I concluded the net force on block B would be (300-3T) where T is the tension in the string and similarly, on block A it would be 2T. However, the answer I get (1.71) is incorrect. The correct answer is 1.56. Could someone guide me to the solution of the question. Sincere Thanks!
  11. R

    Find percentage of red gumballs in this gumball machine

    A gumball machine contains 232323 green gumballs, 525252 red gumballs, 343434blue gumballs, 616161 yellow gumballs, and 303030 pink gumballs What percentage are red ,do you add up the elements and put it over the total?
  12. M

    Power to drive rollers in a machine

    Hi, I've attempted to solve the first part (see file Position 1) in mathcad, but have no idea if it's correct, at least for the first part, as I am assuming, that the steps will be the same for the rollers in the remaining positions. So if I can manage to calculate the first one correctly, I...
  13. F

    Machine learning vs statistics

    Hello, I am trying to wrap my head around the difference between machine learning and statistics for predictive purposes and interpretability... Is there a sharp difference between the two in terms of predictive power? I understand how machine learning needs to be first trained with data to...
  14. solarcat

    Atwood Machine Massive Pulley

    A net torque is required to make the pull rotate, so this can only occur if the tension forces differ. I know mass 1 will accelerate upwards and mass 2 will accelerate downwards, so T1>mAg and T2<mBg. But I don't know where to go from there.
  15. B

    How to measure water flowing from a washing machine pump?

    Hi all Am trying to find a way to measure the vol/time flow of water from the washing machine. Is there an electronic component that can be used like a coil of copper wire over the tube and the do something with a microcontroller perhaps and it figures out much flow? by electromagnetic...
  16. Tiqo

    Electrical Repair of an old JJ LlOYD T20K tensile machine

    Hello, I am currently a mechatronics engineering student, I am working on a school project: retrofitting a tensile machine. The goal of the project is to improve the human-machine interface as it is a very old machine, it is a JJ LOYD T20K, my problem is that the machine no longer works(it...
  17. J

    A physics perspective needed on how the Mitochondria machine works

    I purposely added this post to the general physics thread rather than the biology thread because the solution is probably not in biology. Basically my PhD is in mitochondrial biology. Mitochondria are the energy producing organelles in the body which make energy by adding a chemical bond...
  18. K

    Virtual work in Atwood's machine

    The first chapter in Goldstein's Classical Mechanics ends with 3 examples about how to apply Lagrange's eqs. to simple problems. The second example is about the Atwood's machine. The book says that the tension of the rope can be ignored, but I don't understand why. The two masses can move...
  19. J

    Machine Learning or Deep Learning for a Lab Experiment

    Hi, I want to try out a bit of machine learning or deep learning with an optimisation problem in the lab. However, I'm confused at what the best option would even be or whether my optimisation problem is even applicable to either. Firstly, the lab set up hasn't been built yet, I am computing...
  20. F

    Machine in Clausius' 2nd law of thermodynamics?

    Hi all, sorry for the condensed title of my post. Any other version of the question I'm trying to ask turned out to be longer than allowed. So, my question is about the wording in some versions of Clausius' statement of the 2nd law of thermodynamics. From time to time I read something like...
  21. A

    Need a machine to impart measurable charge (Coulombs) at will

    Hi there, Does anyone know of a machine/equipment/technology, etc. that allows a person to give charges (Coulombs) to conductors in a measurable way? I've rubbed a ton of plastic rods with fur but that's not too measurable. The Van De Graaff is overkill or it if I try to connect alligator clips...
  22. O

    How Does the Speed of Block B Compare in a Three Mass Atwood Machine?

    In the cable-pulley system shown here, block A is moving upwards at a speed of 5m/s and block C is moving downwards at a speed of 2.5m/s. What is the speed of block B? (See attached picture) This seems easy, I just want to make sure I'm not crazy. If mass B moves downward some distance d...
  23. T

    Atwood machine with variable mass

    Homework Statement We have an Atwood machine like the picture below. one side (left) is a bucket full of water which has a hole on the bottom and the water is flowing with rate ##dm/dt = \alpha = const##. The initial mass of bucket with the water is ##m_0##. On the other side (right) we have a...
  24. Felipe Lincoln

    Python Is machine learning entirely based on decision tree?

    Are all the machine learning predictor algorithm based on decision tree? Even classifier and regressors?
  25. kolleamm

    Can I Build My Own Coil Winding Machine for Neat and Organized Winding?

    Are the manual winding machines capable of winding wire in two directions by just turning the crank? left to right, right to left, left to right etc... I want to neatly wind wire on a coil not just wind it down the middle and hope the wire falls into the right place. Thanks in advance!
  26. Oats

    Studying Self Study roadmap for Machine Learning

    Hello, I am a second year PhD student in mathematics currently studying logic. I have recently begun questioning staying in the field, and I really think I may want to work in Machine Learning, at the very least in the theory of it. I am willing to self study from machine learning books, but...
  27. arturo

    Half Atwood machine: acceleration after inital force

    Homework Statement Assume that the block on the table (Figure 1) has twice the inertia of the hanging block. (a)You give the block on the table a push to the right so that it starts to move. If the magnitude of the frictional force exerted by the table on the block is half the magnitude of...
  28. Matthew Titus

    Calculating Motor Torque for Cricket Bat Knocking Machine

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  29. YoungPhysicist

    JavaScript PF Alert Machine: Can I Monitor Forum Alerts Without Logging In?

    I used to check up on this forum for every hour to see if there are ant new alerts of me, but now I ran into a problem: I actually have an eye treatment in process which the doctor told me yesterday that I can only view this forum for 1 hour a day, which makes checking once per hour impossible...
  30. Felipe Lincoln

    Python Is there a recommended book for learning machine learning with python?

    What's the best book to learn machine learning using python?
  31. J

    Is the block moving in an Atwood machine when climbing up a rope?

    Homework Statement [/B] As stated in the included pics, you are climbing up a massless rope on a frictionless pulley, attached to a block equal to your mass which is hanging on the other side. You move a distance d along the rope. Does the block move? If so, how much? Homework Equations F =...
  32. john-b

    Potential Acceleration of an Atwood Machine

    Homework Statement In the diagram, m1 has a mass of 47 kg and m2 has a mass of 35 kg. The coefficients of friction between m1 and the surface of the inclined plane are µs = 0.42 and µk = 0.19. (a) If the masses are held in place and then released, will they start to move? (b) If the answer...
  33. José Ricardo

    The time when AI can overcome humans

    How much time the machine can overcome the human? I was thinking about around 50 years? But I am not sure. I would like that you guys can take me this doubt.
  34. ForecasterJason

    Calculating actual weight lifted on a pulley weight machine

    Hi, I have a pin-loaded pulley weight home gym machine. There are 9 weight plates that are 10 lbs each, so for each exercise the maximum weight that can be done is 90 lbs. However, there is a chart in the manual that shows the weight resistance for various exercises based on how many plates are...
  35. M

    Is a conventional lathe a 1.5 axis machine tool?

    In a lathe, the cutting tool can be moved in the horizontal plane(x and y axes).So x and y are the 2 axes. But one of my teachers said that lathe is a 1.5 axis machine.Is it right? Why are conventional drilling press,shaper and planer half axis machine tools?
  36. G

    Misc. Exploring Materials Engineering with DIY Test Machine & Arduino

    Hello there. I'm a veteran science teacher at the middle and high school level. I've taught a few years of physics and am interested in moving towards engineering. I have looked at a number of available curricula like Project Lead the Way which require a significant investment in time and money...
  37. stockzahn

    Two operating systems or a virtual machine

    Dear all, my PC runs on Windows 10. In the near future I will have to perform some simulations with Open FOAM. I've already done that some years ago (Windows 7 and I used a virtual machine to be able to run Ubuntu/Open FOAM). My experiences were that the program was executed very slow (despite...
  38. 2

    Is this a Turing-complete machine?

    Say a Turing machine is simulated by the following rules: A number of states can be defined. Each state is defined by : specifying what the head writes in the current cell in case of each symbol of the alphabet specifying where the head moves (left or right) in case of each symbol of the...
  39. ShayanJ

    A brain-like implementation of a Turing machine

    At first I should say that this thread involves many scientific fields and I don't think there is any correct section of PF to put it under so I just went with the engineering. One of the greatest mysteries(maybe the greatest) that science is trying to solve today, is the emergence of...
  40. M

    Engineering Exploring the Fundamentals of Machine Design: Similar Books and Resources

    Hi. I have a problem and I will be so grateful if someone can help me with this. I would like to know are there books that are similar to P.Orlov: Fundamentals of machine design 1,2 and 3. The book should include pictures of what is wrong and better solution of certain design. Thank you in...
  41. romascenko

    Why is my material testing machine throwing out errors at speeds over 250mm/min?

    We have a problem with mentioned machine when making tests at speed like below 250mm/min its ok but if we go over that speed machine throws out error its like that the machine hasnt got enough power and because there is not smooth working programm shut down test. If i do a speed ramp to go up...
  42. I

    Calculating Accelerations in an Atwood Machine with an Applied Force

    Homework Statement The masses of blocks ##A## and ##B## are 20kg and 10 kg, respectively. The blocks are initially at rest on the floor and are connected by a massless and frictionless pulley. An upward force ##\vec{F}## is applied to the pulley. Find the accelerations ## \vec{a_A}## of block...
  43. Aleoa

    Perpetual motion machine - Intuitive meaning

    I'm reading the first Feynman volume on physics. In the chapter about Conservation of Energy, the author explains with the following sentence what is a perpetual machine ( in this case a weight-lifting machine). "If, when we have lifted and lowered a lot of weights and restored the machine to...
  44. flyguille

    B Physics in a manual angle grinder machine

    First, I am not a physician (just a normal guy from Argentina), and I know the short answer for the following question is "it isgyroscopic effect". But why?... My original question was: "I feel the effect when using "motor angle grinder", when turn off, you can move it any direction easy, when...
  45. C

    Creating a Multi-Radio Wave Demonstration: How to Find the Right Machine

    Is there a machine that can emit multiple radio waves simultaneously? I am trying to create a demonstration, but it requires multiple radio waves at once and cannot find any machines that can do so.
  46. P

    (Weightlifting Machine) Weight stack pin design problem

    Hi and thanks if you decide to go through this post. As part of a school project I'm analysing a weight stack selector pin used in various fitness training equipment. Its material, length and diameter are known. 1. Homework Statement The pin is placed into a hole equal to its length (from the...
  47. G

    Prob/Stats Books on Machine Learning without a strong math background required

    Hi everyone, I am a software developer (bachelor's degree in Europe, different than a bachelor's degree in the US I believe) and I don't have a strong math/physics background but I am willing to learn. For a few years now, I have been really interested in machine learning but until now, I only...
  48. P

    Calculating curve for a machine

    Mod note: Thread moved from the Precalc Homework section 1. Homework Statement So I am designing a machine. the issue is I have to calculate like 8 things and the maths is floating in my head but I can't get there. the requirements are that X axis squared + Y axis Squared = 75 Squared. then...
  49. W

    Uploading a Database to another Machine

    Hi All, I want to work with my friend using a database I have in my machine but he does not have in his. Only method I can think of to send it to him is scripting it, sending him the script and having him run it in his machine ( we both have SQL Server Dev ). Is there some other way? Just...
  50. P

    Mind boggling machine learning results from AlphaZero

    I have always been on the skeptical, but not dismissive, end of judgments about achievemnts and rate of progress in this field. However, the following (please read through carefully) just completely blows my mind: https://en.chessbase.com/post/the-future-is-here-alphazero-learns-chess A self...
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