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. F

    Torque and force problem -- Atwood's Machine Motion

    Homework Statement Solve problem 8.1, but using force and torque rather than conservation of energy. (Image of 8.1 attached) Homework Equations T = f x d f = ma The Attempt at a Solution I think I might have to find the torque on the disk, which I’m guessing would be 2mgr - mgr, but I’m...
  2. S

    Engineering Electrical Machine - Shunt DC Motor Problem

    Hi guys, can someone please have a look at the following problem that I am struggling with; An 8.25 kW shunt DC motor is supplied with a terminal DC voltage of 300 V. The armature resistance of the motor Ra is 0.25 ohms, and the field resistance Rf is 40 ohms. The field winding consists of 1500...
  3. E

    Good books to learn machine learning using Python

    Hello, I am new to both Python and machine learning. I am trying to learn by reading books on machine learning using Python. I started with this book. I could manage the first 3 chapters (although I had to dissect the codes on Github because not all the codes are included and explained in the...
  4. Q

    Physics Machine learning with particle physics

    In which fields of physics can we apply machine learning concepts? If I take data science master's with minor in particle physics or astrophysics, what are the possibilities that I would be employed as a physics related data scientist? (I am a programmer and I would like to change my career...
  5. D

    Kinetic energy of a compound system (atwood machine)

    A system is defined as two connected masses in an atwood machine and the earth. How do I find total kinetic energy in a system where more than one object is moving (or is only one object actually moving since the two masses are connected with a string? idk) This is an isolated system so... ΔK...
  6. D

    Finding the decrease in potential energy of atwood machine

    Homework Statement In the system below, m1<m2. When the object of mass m2 has descended a distance h, the potential energy of the system has decreased by: Homework Equations the answer is (m2-m1)gh The Attempt at a Solution I used ΔU= Uf-Ui m1gh-m2gh=ΔU (I think that the decrease in...
  7. S

    Automotive Effect of machine weight on clutch Power/Energy

    Why does increase in machine weight doesn't have much effect on clutch's power and energy? I do understand weight is basically normal force, and increase in normal force should make it harder for the transmission to push the increased amount of torque? What is the math behind it?
  8. HDG

    Emergency stop for a machine with valves and cylinders

    a)Design and draw a circuit using the cascade system to operate 2 cylinders (A&B) which, on the operation of the start valve produces the sequence A- B+ B- A+. The cylinders should park in the positions B- A+ when the start switch is in the off position b)Modify the circuit designed for part...
  9. jedishrfu

    Quantum Machine Learning Finds the Higgs in the Haystack

    ArsTechnica recently published this online article on using quantum computing to identify Higgs interactions in LHC data having simulated many possible higgs interactions to train the model with 36 attributes...
  10. Poetria

    Atwood's Machine: Finding Tension at A & D

    Homework Statement A rope of uniform mass density is passed above the top of a fixed pipe of circular cross section. Points B and C - the points where the rope loses contact with the pipe. Points A and D - at the ends of the rope The length of the segment AB = 2d The length of the segment CD...
  11. V

    Other Finding the Perfect Machine Learning Textbook for a Physics BSc

    Hello, recently I've become interested in learning more about machine learning, and am looking for a good textbook to study from. My background: Finished most of the required courses for my physics BSc and the related math courses. Some relevant courses I have taken: Linear Algebra Calculus...
  12. L

    Moore machine output with a leading zero

    Homework Statement The question deals with a Moore machine of which I have omitted the diagram for reasons which will become apparent below. The initial state is ##q_0 / 0##. What is the output if the input string is aabbabaaa? 1) 101111101 2) 1101111101 3) 1010000010 4) None of the above...
  13. C

    Machine learning / AI - Where do I start?

    I am a programming novice with minimal knowledge of C, Python and Java that I've taught myself from books and videos. Eventually I'd like to get into AI and machine learning but I have no idea where to start. Thus far, the minimal coding I've learned has been rather aimless with no specific...
  14. S

    How Does Mass Loss Affect Acceleration in Atwood's Machine?

    Homework Statement The figure shows Atwood's machine, in which two containers are connected by a cord (of negligible mass) passing over a frictionless pulley (also of negligible mass). At time t = 0 container 1 has mass 1.3 kg and container 2 has mass 2.7 kg, but container 1 is losing mass...
  15. L

    "Shifting" non-inertial frame in Accelerating Atwood Machine

    Hello, I was referring to this thread: https://www.physicsforums.com/threads/accelerating-atwoods-machine-problem.44305/ to solve a problem on accelerating atwood machines in which, naturally, one attempts to find the acceleration of each of the individual masses. Although I now understand how...
  16. A

    B Understanding Reversible Machines: Exploring Feynman's Limitations

    I am no able to understand the reasoning of Feynman in deducing that it is impossible to build a machine that will lift a weight higher than it will be lifted by a reversible machine. I am also not able to understand what reversible machine is. So, please help me.
  17. K

    Applied Differential geometry for Machine Learning

    My goal is to do research in Machine Learning (ML) and Reinforcement Learning (RL) in particular. The problem with my field is that it's hugely multidisciplinary and it's not entirely clear what one should study on the mathematical side apart from multivariable calculus, linear algebra...
  18. F

    Atwood's Machine: Understanding Acceleration and Tension

    Homework Statement There is an Atwood machine (image attached) with 3 masses, m, 2m, and 3m. Homework Equations What is the acceleration of each mass? The Attempt at a Solution [/B] I’m not quite sure where to start here. I know that there is a gravitational force downward on each mass...
  19. Gean Martins

    Physics Is There a Connection Between Physics and Machine Learning?

    Hello everyone, I'm on my last undergraduation year in Physics and I've been asking myself what specific area to work with . Two months ago I've been studying Machine Learning and it amazed me so much that i push myself to come here and ask your opinions about it : There's a way to work deeply...
  20. Ackbach

    MHB Fantastic Machine Learning Course

    I just finished Andrew Ng's Machine Learning course on Coursera. I would highly recommend this course to anyone interested in data science or in applying machine learning concepts to real-world problems. He not only explains the algorithms at just the right level, but shows you the wisdom of...
  21. cnh1995

    Synchronous machine problem (not homework)

    < Mentor Note -- thread moved to HH from the technical forums, so no HH Template is shown > Here's a question from a national-level engineering exam in India called GATE (2017). It is for 2 marks, numerical answer type. Two synchronous motors A and B in parallel with identical O.C...
  22. S

    What is the Torque of My Machine's Shaft?

    hello everyone, I am a mechanical design engineer in pharmaceutical machine maker company. my question is about the torque of the shaft in my machine. In picture you can see the pan, in which the medicines are placed for drying and colour. the details is placed on...
  23. T

    What could a time machine plausibly look like?

    So, I've been doing some research for a novel I'm working on that's based around time travel, but seeing as I'm definitely no expert on the theories concerning it, thought it might help to have someone a little more knowledgeable on the subject review my ideas. Thus far, I've done some...
  24. FallenApple

    What are the Limitations of Machine Learning in Causal Analysis?

    From what I understand, machine learning is incredibly good at making predictions from data in a very automated/algorithmic way. But for any inference that is going to deal with ideas of causality, it's primarily a subject matter concern, which relies on mostly on judgment calls and intuition...
  25. G

    B Machine learning + Kepler data

    hello everyone anyone knows if this research is made? imagine you have available the data from the kepler telescope to search exoplanet, create a training set of data based on the concept of find exo planet , calculate their orbit and try to design the virtual exo solar sistem , understand the...
  26. J

    Weighing machine in an elevator

    Homework Statement Homework EquationsThe Attempt at a Solution [/B] Initially , let the tension in spring be T Since hanging mass is just touching the weighing scale , T = 5g When elevator starts to accelerate upwards with acceleration 'a' , then on applying a fictitious force '5a'...
  27. S

    Force needed to drive a Keiser Force Machine 10" with 1 hit

    I am a 66 y/o firefighter that competes in the Firefighter Combat Challenge. One of the evolutions requires the FF to use a Keiser Force Machine. This is a 160# beam on Teflon runners, 2 each 2" x 36", in a stainless still tray. Using a 9# shot hammer we have to drive the beam 5'. The problem...
  28. S

    How does a hydraulic machine work?

    Homework Statement How does a hydraulic machine work? Homework Equations P=F/A The Attempt at a Solution I know that these work because the pressure is the same throughput the system and that these are multiplier machines because the force is magnified by the magnified area, but I don't...
  29. C

    I Solve Mystery of Phi-Based Equation: Help Colin

    If you know phi it is about 1.618...=2cos36. The equations when x=phi which is equal to 0 is x^2-x-1=0. I took the first derivative squared and the second derivative cubed. The equation with x=phi is: [2x-1]^2+2^3=13 Check for yourself, if you fill in phi you get 13. Anyway, I do not know what...
  30. Sanchayan Ghosh

    How to further metrology study from machine design approach?

    Hello, I have metrology in my 4 semester in Bachelor's of Engineering in Mechanical Engineering. However, the books that we get (Engineering Metrology, R.K Jain,) give only a brief principle of how the instruments work. I want to further my study of this subject with an intention to design...
  31. A

    Effects of Rolling Resistance on Tension and Acceleration in an Atwood Machine

    We had a lab using an Atwood Machine with block A being on the surface and block B as the hanging object with different masses each round. Rolling resistance was present. Question 1 asked whether or not the tension in the string was less than, greater than or equal to the magnitude of the...
  32. TMT

    Can We Generate Perpetual Machine in 2nd Degree from Global Warming Heat?

    Concerning Global warming; Can we cool atmosphere by converting it's heat content to electricity? if we do so is it became a perpetual machine in 2nd degree or not? I'm not so good in thermodynamics. But I'm sure it will not violate 1. rule energy is not created from noting, energy converted...
  33. A

    Synchronous Machine Voltage Curves & Torque Relation to Armature Current

    Hello everyone Im new on the forum and I just discovered what are sync machines... I have really basic question what I still cannot figure out.. I did some experiments with motor for different field currents and torques. In the result I measured armature currents and did V curves. But next...
  34. E

    B How do you build a quantum suicide machine?

    Hey! I posted this thread hoping that there are experts about quantum physics here. Please if you do not know a lot about the subject, don't answer this question: First things first, to be clear: I’m NOT building a quantum suicide machine and I’m NOT trying to kill myself. I’m just curious...
  35. dsfrankl

    Double Atwood Machine Problem

    Homework Statement If the masses for a double Atwood machine similar to the own shown in the attached picture are m1=2.0kg, m2=3.0kg, and m3=8.0kg: (a) what is the magnitude of the acceleration of the system and (b) how would you draw free-body diagrams for this problem? NOTE: m3 does not...
  36. J

    B Perpetual Machine: Is It Possible?

    Hey, I'm new on the forum and I have a pretty basic understanding of physics, I hope this question isn't obvious I just need some help getting my head around it. I was reading up on the problem with gravity of a means of generating perpetual energy, the fundamental problem being that...
  37. unwillingly ignorant

    'The Time Machine' films... Awful

    I just noticed there was a sci-fi category and thought that this would be a good place to vent my outrage at the two 'the time machine' film adaptations. i saw them both recently. They miss the point entirely and are logically inconsistent! Why make a film of somthing that you clearly have no...
  38. F

    I Reynolds number of washing machine like object

    What would the reynolds number be for a closed pipe spinning like a washing machine? would the characteristic length be the diameter... if so why. Everything I have read is so vauge on this. How can I determine it for strange situations? Can I skip it and figure out if flow is laminar or...
  39. bradzyc

    Fourier Series: Stamping Machine Positioning Function

    Homework Statement Homework Equations All Fourier series trigonometric equations. I think we are required to use sigma function, integrals, etc.[/B]The Attempt at a Solution We are currently working through our Fourier series revision studying integrals of periodic functions within K.A...
  40. T

    Calculating Power for Roll Forming Machines: Theory and Practical Applications

    How to calculate power of roll forming machine? Is there any theory for calculation? Actually i am designing 10 step roll forming machine, But confuse about power calculation...
  41. evinda

    MHB Is this a possible Turing machine for computing $f_2$?

    Hello! (Wave) Let $f_1(x,y)=x+y$, $f_2(x,y)=xy$. I want to find a Turing machine that computes $f_1$ and describe one that computes $f_2$.A Turing machine can: read delete write The numbers are in binary form. We have to add the last element of $x$ to the last element of $y$ , then...
  42. S

    Explanation of how spin art machine works

    I've got to explain how spin art works to some 5th graders tomorrow. Basic setup: Paper is attached to center of a horizontal disk. Paint droplets are placed at different places on the paper. Disk is spun which causes paint to produce a pattern flowing away from the center of the disk/paper...
  43. M

    MHB Gaming machine : The probability of winning

    Hey! :o At a gaming machine the probability of winning is 25%. A player plays 20 rounds. Which is the probability that he wins exactly five times? Which is the probability that in ten rounds he wins five times? Which is the probability that in ten rounds he wins ten times? Which is...
  44. A

    Why can one not make an inside-out dc machine?

    In synchronous ac machines, the field is usually on the rotor and the power winding on the stator, where it's easy to cool. The field draws a small current and needs only small brushes. In dc machines, the field is on the stator and the power winding on the rotor, where it's harder to cool...
  45. S

    Switching from phenomenology Masters to machine learning PhD

    I am doing a Masters in theoretical physics. It's been half a year since I've begun my Masters. Recently, I find myself intrigued by machine learning and would like to do a PhD in machine learning after I finish my Masters in theoretical physics. I am rather afraid to break it to my supervisor...
  46. K

    Atwood's Machine: Solving for Force & Acceleration

    Homework Statement [PLAIN]http://[url%3Dhttps://postimg.org/image/pov8gzkr5/] The question is shown above in the image. Homework Equations F=ma The Attempt at a Solution I personally think the answer should be option B. The movable pulley requires 1/2 of the force compare with the fixed...
  47. L = K - U

    Infinite Atwood Machine (Morin Problem 3.3)

    I could've peeked at the solution manual and end with it at that. However, I'm trying to change this nasty habit and solve this problem myself. I might be too ambitious. Here goes. Homework Statement Consider the infinite Atwood's machine shown. A string passes over each pulley, with one end...
  48. I

    What is the acceleration of the masses in a double double Atwood machine?

    Homework Statement This is actually a problem I solved but I'm having trouble reconcile the answer with my intuition (Check the end of the post for my actual question). The problem: Find the acceleration of the masses for the double double Atwood machine (see figure) The masses are from left...
  49. thunderstrike33

    Writing Vector Loops and Geometric Constraints for a Mechanism with a P1 Joint

    How would you write the vector loops and geometric constraints for this mechanism?
  50. Vitani11

    Velocity of masses on an atwood machine?

    Homework Statement 2 masses m1 and m2 are attached by a string to a massless pulley. mass 1 is on the surface while mass 2 is hanging off. mass 1 experiences a friction force (mu)k. What is the acceleration of the system? What is the velocity of mass 1 in terms of mass 2? Homework Equations...
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