What is Centrifugal: Definition and 342 Discussions

In Newtonian mechanics, the centrifugal force is an inertial force (also called a "fictitious" or "pseudo" force) that appears to act on all objects when viewed in a rotating frame of reference. It is directed away from an axis which is parallel to the axis of rotation and passing through the coordinate system's origin. If the axis of rotation passes through the coordinate system's origin, the centrifugal force is directed radially outwards from that axis. The magnitude of centrifugal force F on an object of mass m at the distance r from the origin of a frame of reference rotating with angular velocity ω is:

The concept of centrifugal force can be applied in rotating devices, such as centrifuges, centrifugal pumps, centrifugal governors, and centrifugal clutches, and in centrifugal railways, planetary orbits and banked curves, when they are analyzed in a rotating coordinate system.
Confusingly, the term has sometimes also been used for the reactive centrifugal force, a real inertial-frame-independent Newtonian force that exists as a reaction to a centripetal force.

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  1. J

    Centripetal and centrifugal force

    In circular motion why the centripetal and centrifugal not get cancelling. .?
  2. D

    Design of IC engine coolant pump (centrifugal)

    Hello, I am to design a pump for the cooling circuit of a 4-stroke, 4-cylinder gasoline engine. The engine has already been designed. I am currently referring to Pump Handbook (McGraw Hill publications) and trying to get a hold of Centrifugal Pumps-Design & Application (Ross-Lobanoff). One...
  3. J

    Temperature changes of gas under centrifugal acceleration

    What happens to gas temperature in different parts of closed chamber (let's say for arguments sake, a closed cylinder made out of material that transduces heat minimally) that is rotated centrifugally so, that one end of the chamber experiences much greater centrifugal acceleration than the...
  4. Andrew Mason

    Is the concept of reactive centrifugal force valid?

    I came across this http://en.wikipedia.org/wiki/Reactive_centrifugal_force" I think this is Wikipedia nonsense. There is only one centrifugal "force" and it is the inertial effect or "pseudo force" or "fictitious force" observed in a non-inertial frame of reference. The authors of these...
  5. R

    Centrifugal force and direction

    we wouldn't experience the centrifugal force unless we change direction. Suppose we are flying an twin engine airplane and one side engine fails, to counteract this the pilot applies opposite rudder and flies straight. Would we experience the centrifugal force and does the turn indicator...
  6. K

    Varying head rise in Centrifugal pumps

    Hi PF! I have a question regarding the use of centrifugal pumps. I have a system with a constant flowrate of water at 2m^3/s pumping water from a lower to a higher reservoir. The inlet condition is a head of 10m. The Height of the upper reservoir will vary from 83m in the beginning to 287m...
  7. K

    What is the difference between centrifugal and centripetal forces?

    Maybe misspelled, i know. What is the difference between the two?? Please explain.
  8. M

    Aircraft Fuel Booster Pump - Centrifugal & Immersed in Fuel

    What is the correct way to put limitation on different aircraft flying conditions with respect to the cavitation point of view of the Fuel booster pump in the aircraft? The pump is immersed in the fuel and the fuel tank is vented to atmosphere(in atmospheric pressure, which will change with...
  9. M

    How do electrons maintain a stable distance from the nucleus?

    Please correct me if I am wrong in any of this 1) Electrons are able to go around the nucleus of an atom due to the centrifugal force resulting from the weak/strong force (one of them) 2) Quantum physics says that particles can be in 2 places at the same time. 3) Therefore can't an electron...
  10. S

    Calculate Work, Isentropic Head & Efficiency of a Centrifugal Gas Compressor

    Hi everyone! I have a question and I would be so thankful if you could help me! For a Centrifugal Gas Compressor, if I have the flow rate, the input and output temperatures and pressures in specified rpm, then could I calculate its needed work, isentropic head and efficiency? how? Thanks! Sara
  11. H

    One-way centrifugal clutch - seatbelt clutch

    Hello everyone, I'm new to the forum here and have a question that is probably fairly easy for engineers to answer. I'm searching for a clutch that provides the same functionality as a seat belt clutch, i.e. it rotates both directions at slow rpms but when pulled quickly in ONLY one of...
  12. J

    Calculating Centrifugal Force in a "Rotor-ride

    In a "Rotor-ride" at a carnival, people are rotated in a cylindrically walled room (think of a ride like the gravitron). The room radius is 4.6m and the rotation frequency is .4 revolutions per second when the floor drops out. What is the minimum coefficient of static friction so that the...
  13. AlexChandler

    A Centrifugal Pump and Angular Momentum

    Homework Statement I have attached a copy of the homework as there is also a picture of the pump. This problem is number 6. A centrifugal pump processes j = 18m3/min of water, with inlet and outlet velocities of v = 15m/s. The impeller rotates in the clockwise direction around the...
  14. D

    Calculating Centrifugal Force: 10lbs Steel Wheel, 6in CG, 7200rpm

    Homework Statement 10 lbs. steel wheel with its center of gravity at 6 inches from the axle rotating within a circular frame at 7200 rpm Homework Equations 10lbs. x 6 inches x 72002rpms x 0.000028416(constant) = 88,385 lbs. The Attempt at a Solution 10 x 6 x 72002 x 0.000028416...
  15. A

    Classical Mechanics: Fictitious Forces: Centrifugal, Coriolis, Transverse, etc.

    Homework Statement Figure is attached. In an amusement park ride called the hammer a large beam rotates in a ver- tical plane about a central pivot (see figure). Cages are attached to the end of the beam; these rotate independently. The riders are strapped to the walls of the cages. The...
  16. P

    Rotary Swivel Assembly: Effects of Torque and Centrifugal Force

    Hello, I'm designing for a rotating swivel assembly that will be used for a high pressure cutting system. The rotary swivel is set for an allowable 2800 bar of pressure but has to rotate at 300 RPM while allowing a pressure of 12-15,000 psi pass through it. My question consists of two...
  17. A

    Simple centrifugal force problem

    simple centrifugal force problem please help i have a 2m long tube spinning around its center at w=1 theres a 1 kg projectile at 1 m distance from the axe inside the tube that is released at a certain moment what speed does the projectile have when it leaves the tube? please show me...
  18. H

    Pumping fluid against a centrifugal force

    Hello. I am in need of some assistance regarding a theoratical problem I have. It goes something like this: Imagine a vertically placed axle, rotating at a constant angular velocity (omega). From the middle of this axle extends an arm and on the edge of that arm is a unit containing...
  19. K

    Centrifugal Force- Finding Speed of Satellite

    Homework Statement In order for a satellite to move in a stable circular orbit of radius 6736 km at a constant speed, its centripetal acceleration must be inversely proportional to the square of the radius r of the orbit. What is the speed of the satellite? The universal gravitational constant...
  20. N

    Centrifugal governor calculations

    Hello all, I am having problems working out the weight I require for as braking system. I have a wind unit bringing me 1kw of power through a standard generator. However the wind I catching is far stronger than my generator can take, anything over a KW will kill my unit so I decided to make...
  21. T

    Direction of Centrifugal Force?

    I am trying to understand how centrifugal force works when applied to a train. For example, if I had a train that had zero super elevation, was traveling along a curve, of some radius at some speed then the centrifugal force acting on the train would be of a certain magnitude which would act...
  22. T

    Does centrifugal force have a gradient

    Hello I was wondering if centrifugal force had a gradient, what i mean by this is this:- A train is traveling on a straight section of track with no centrifugal force. The train then travels along a transition, as the train travels along the transition, the centrifugal force builds up...
  23. Telemachus

    Centrifugal Force Homework: Airplane 150m Radius, 80kg Pilot

    Homework Statement I have this exercise which says: An airplane moves along a circular path of 150 meters radius, contained in a vertical plane with constant speed module 200km / h. a)Determine the force resulting from the interaction between the seat and the pilot, whose mass is 80kg, at...
  24. C

    What happens with the sea level due to the centrifugal acceleration?

    What happens with the sea level due to the centrifugal acceleration?
  25. J

    Hyperbolic disk centrifugal stress calculation

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  26. N

    How Do You Calculate Maximum Flow and Head in a Vertical Centrifugal Pump?

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  27. H

    Bifurcated Asteroid - Centrifugal force

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  28. D

    Balancing Centrifugal and Gravitational Forces: A Homework Problem

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  29. L

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  30. P

    Calculating Coriolis and Centrifugal Forces in a Rotating Frame

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  31. S

    Why do astronauts feel weightless inside a space ship and centrifugal force?

    Hello everyone, Ok so I read that the reason they are in free fall is because they are going in a circle like this , and the Earth curves away from them at the same time or something, could anyone explain it to me simply. Also why don't astraunauts get pushed to the periphery of the...
  32. M

    Rotating reference system - centrifugal force

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  33. U

    Difference between pseudo force and centrifugal force

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  34. A

    Centrifugal acceleration over a changing curve?

    Hi... I have kinda made this problem up myself. How would one calculate the effect of the centrifugal force over a curve. For instance the following problem is taken from Physics GRE test GR8677 Question 6, but I have modified the question. The question states. A particle is initially at...
  35. A

    Custom Problem Centrifugal Acceleration with varying radius

    Hi... I have kinda made this problem up myself. How would one calculate the effect of the centrifugal force over a curve. For instance the following problem is taken from Physics GRE test GR8677 Question 6, but I have modified the question. The question states. A particle is initially at...
  36. C

    What are the units for centrifugal force and how do you calculate it?

    I found this on Wikipedia for the equation relating to centrifugal force. F = d/dt (m*v) So I have my mass and velocity but I just multiplied the two, that can't be correct can it. You have to derive something I imagine. Also would the units just be in lbs or Newtons. I'm using feet/s...
  37. K

    What Causes Imbalance in Rotating Bodies?

    Hi, I've read about the balancing of rotating masses. In the context every author(even J.E.Shigley in his book Theory of machines & mechanisms) mentions that a rigid body while rotating, it experiences a "Centrifugal Force" . Now we know that centrifugal force is a pseudo force when we analyze...
  38. G

    A question about centrifugal force

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  39. stevebd1

    Centrifugal Forces and Black Holes

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  40. M

    Efficient Testing Methods for Centrifugal Blowers - Tips and Tricks

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  41. M

    2 identical parallel centrifugal pumps ?

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  42. M

    Centrifugal Pump: How to Obtain a Curve & Detect Cavitation

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  43. W

    An odd thought on centrifugal compressors.

    Hi everyone I'm new. I had an odd thought when thinking about centrifugal compressors. Take a normal straight veined compressor. Normally it just sucks the air straight in and has to accelerate it effectively from zero to however fast it ends up going. But what of you modified the...
  44. C

    Centrifugal and circular motion

    ell let's say there's a cabin and its rotating about its axisand we have a block of mass m placed (not at the the centre of the cabin) and there's some friction between the the block and the surface now let's say the speed of the cabin is increased a lil high so that friction can no more...
  45. G

    Helium balloon centrifugal force

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  46. edpell

    NASA NASA reluctance to use centrifugal acceleration

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  47. S

    Sources for Centrifugal Compressor design

    I would like sources for centrifugal compressor design. Anything, such as books, e-books, journals, websites, etc. will do.
  48. S

    Relation of gravity with centrifugal force & gyroscopic effect?

    Is there any relation of gravity with centrifugal force & gyroscopic effect? Rotating body shows centrifugal force due to radial acceleration α=rω2. This causes force just like gravitation force. Rotating gyroscope doesn’t fall & maintain motion. This is just like anti-Gravity. Can I say that...
  49. K

    Centrifugal pump's Test performance prediction from CFD

    How can we predict the actual test performance of pump from CFD. I need some formulation/calculation method to predict closure.
  50. M

    G: Why Is My Centrifugal Pump Not Working Properly?

    hello guys here's another question my pump not pumping liquied althoug the pump is under the tank why ?
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