Frame Definition and 1000 Threads

A vehicle frame, also historically known as its chassis, is the main supporting structure of a motor vehicle to which all other components are attached, comparable to the skeleton of an organism.
Until the 1930s, virtually every car had a structural frame separate from its body. This construction design is known as body-on-frame. By the 1960s, unibody construction in passenger cars had become common, and the trend to unibody for passenger cars continued over the ensuing decades.Nearly all trucks, buses, and most pickups continue to use a separate frame as their chassis.

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  1. S

    Polarization calculation, frame alignment

    Polarization calculation, "frame alignment" problem statement A ray of light (represented by a Stokes vector; coming from a light source) goes through an ideal polarizing filter and reflects off two surfaces (X2 and X1, in that order) and . The goal is to calculate what the stokes vector looks...
  2. T

    Rotating Earth as an inertial frame

    According to the principle of relativity - a postulate for Einstein's SR and GR - any frame of reference is as valid as any other for describing phenomena and the laws of physics will be the same in the chosen frame of reference as in any other frame of reference. Taking the rotating Earth as a...
  3. S

    How Can I Design an Anti-Tilt Frame to Withstand a Force of 5 kg?

    I am trying to find the force necessary to tilt a vertical frame. I have a triangular frame, which is standing on one of its sides vertically. I am applying a force or around 5 kg's in the horizantal direction on its upper corner. how do i design the frame so that it will not tilt under this...
  4. G

    How to Solve a Frame Finite Element Problem?

    Hello I have a problem to solve this question in FEM which I apload it here, if you know how to solve this problem can you please help me? Thanks
  5. K

    Help understanding rotation relations in different frame

    In every textbook about analytic mechanics, it will give the relation of time derivative of some variable between the space coordinate and body coordinate \left(\dfrac{d\vec{v}}{dt}\right)_{space} = \left(\dfrac{d\vec{v}}{dt}\right)_{body} + \vec{\omega}\times\vec{v} I don't really...
  6. A

    Spinning Frame of Reference: Inertial or Non-Inertial?

    Homework Statement Is a spinning frame of reference an inertial frame of reference? Homework Equations net torque, net force = ma, equilibrium --> net force = 0, net torque = 0 I've learned that an inertial frame of reference is a frame of reference which is not accelerating. The...
  7. U

    Is a reference frame fixed to a photon an Inertial Frame?

    Hi All, I am a bit confused about reference frames and inertial frames. According to the first postulate of special relativity (if I'm right), all physical laws take their simplest form in an inertial frame, and there exist multiple inertial frames interrelated by uniform translation...
  8. tiny-tim

    Exploring Linear Frame Dragging in the Context of General Relativity

    "Linear frame dragging"? wikipedia at http://en.wikipedia.org/wiki/Frame_Dragging#Frame_dragging_effects says: (Naty1 has drawn attention to this to this in a Library comment.) What is this referring to? Is it a generally accepted terminology, or is it just wikipedia's wishful...
  9. A

    What is an inertial frame of reference?

    Homework Statement What is an inertial frame of reference? Homework Equations -A particle at rest or moving at a constant velocity in an inertial frame of reference implies that the sum of the forces acting on the particle is zero -The tendency of a body to keep moving once it is set in...
  10. A

    Conceptual basis for a non-relative rest frame

    This concept would be dependant on having the technology to actually travel at velocities which we can now, only impart to particles Ie: .99c The plan would be to have 3 ships somewhere in space with negligable gravitational effect. 2 of the ships set out in opposite directions...
  11. M

    Vector Calculus: TNB Frame Vectors

    In vector calculus, with a space curve C, there are the 3 vectors, tangent, normal, and binormal. Are they always considered in their UNIT form, ie., divided by their length?
  12. C

    What Defines an Inertial Frame in Physics?

    since last time i post about the defiinition, i read up about it, how i am still a bit unclear after reading few more post about this topic : einstein: a set of frames which move without acceleration to one another and that the laws of physics hold in the simplest-is the a definition or that...
  13. I

    Four momentum of Photon in Center of Mass frame?

    Hi, I have just been pondering the problem of electron - positron annihilation into a single photon in the CM frame. I was stuck at a discrepancy - that in the center of mass frame, the total momentum of the particles was zero, but the energy is the sum of the energies of the original...
  14. J

    Determining the Support Reactions acting on a frame

    Homework Statement Determine the SUPPORT REACTIONS acting on the frame http://i34.tinypic.com/j94hoo.jpg" You can see I have drawn the FBD, but I am lost on applying static equilibrium about point "F" because I don't know the distance from point "F" to any other point. In order for me to...
  15. J

    Determining the support reactions on a frame

    Homework Statement Determine the SUPPORT REACTIONS acting on the frame (See Picture Below) You can see I have drawn the FBD, but I am lost on applying static equilibrium about point "F" because I don't know the distance from point "F" to any other point. In order for me to sum the moment...
  16. O

    Solving Relative Speed and Flashes in S' Frame

    Homework Statement A red light flashes at position xR = 3:00m and time tR = 1e-9s, and a blue light flashes at xB = 5:00m and tB = 9e-9 s, all measured in the S reference frame. Reference frame S` has its origin at the same point as S at t = t0 = 0; frame S' moves uniformly to the right...
  17. B

    Is Poincare Symmetry Fundamental to Relativity as Proposed by Einstein?

    I have heard the following oppinion: Whether a reference frame is inertial is completely determined by whether Newton's laws are applicable for particles moving at low (that is, nonrelativistic) speeds in that reference frame. Do you agree with it?
  18. S

    Muon Decay at t=2.2x10^-6s in Frame s': Coordinates and Time

    consider two frames s and s' where s' is moving with velocity vector (0.9c,0,0) with respect to s frame. At time t=t'=0 the origin of the two frames coincide. At time t=2.2x10^-6s a muon decays at coordinates (100,0.8,1.0) meters in the s frame. a) At what time and coordinates does the muon...
  19. stevebd1

    Time coordinate in the rain frame

    I'm currently looking at Metric for the Rain Frame in 'Exploring Black Holes' by Taylor & Wheeler (page B-13) and while it's straightforward understanding drrain (which basically equals dr), I'm having a problem getting my head around dtrain. The following is a step-by-step approach but for some...
  20. D

    Lorentz transformation in non-inertial frame

    I am doing some study about the lorentz transformation between non-inertial frames. I wonder if the tranformation is the same as in SR. I need to do the transformation of EM fields in a constantly rotational frame. Can anybody help me with this one. Is there anybook I can refer to? Many thanks.
  21. C

    Can the Exodus Mindset Propel the New Generation to Revolutionary Change?

    The Exodus Frame of Mind Recently David Brooks wrote for the New York Times an article labeled “The Past Meets the Future”. This was an imaginary conversation between Mr. Past and Mr. Future. Mr. Past focused upon our failure to understand the past and in so doing we make egregious...
  22. DocZaius

    According to Alice's frame of reference

    According to Alice's frame of reference, there is a 1kg object moving through space at 1 m/s along the x coordinate. When x = 0 meters, Alice applies 1 Newton of force to the object in the positive x direction. However, Bob simultaneously applies 1 Newton of force in the opposite direction...
  23. F

    Wien's law in relativistic frame

    Can anyone tell me whether Wien's law of displacement is valid in Relativistic frame?? Any help would be greatly appreciated. Can u tell me the names of some books dealing with this topic??
  24. T

    Constructing Local Lorentz Frames in Curved Spacetime

    hi, g.r speeks of the ability to constract local lorentz frame. how can an observer construct such a frame if spacetime is curved? what are his rods and clocks? it seems that if one tried to construct a "hive" of coords using a ruler, then it will not cross as expected... he might even...
  25. T

    Ratio of Kinetic Energies in Center of Mass Frame

    Homework Statement Consider a system of two particles, with masses m1 and m2. What is the ratio of their kinetic energies, T1=T2, in the center-of-mass frame? The Attempt at a Solution I do not really understand the question because center of mass frame was not taught in my class. From...
  26. B

    Showing momentum will be conserved in moving reference frame

    Homework Statement the question gives me the masses and initial velocities of two balls which collide elastically and asks me to prove that it the momentum will be conserved in both a still reference frame and a moving one. Homework Equations The Attempt at a Solution i know that...
  27. jtbell

    How two clocks can each run slow in the other's reference frame

    People often have trouble visualizing how time dilation can be "mutual" in special relativity. That is, if you have two clocks moving with respect to each other, in each clock's rest frame the other clock runs slower. The following example illustrates how this can be possible without...
  28. J

    Euler and lagrange frame of reference

    can anybody please clearly explain me the difference between these two frames of reference with few examples. my exames are closing up. please help me.
  29. S

    Watching young's double slit experiment in moving frame

    Suppose an observer is moving at some constant velocity(<< c) and observing the young's double slit experiment. What changes will it observe compared to an observer at rest? This is what i could make out : 1) The wavelength of incoming light will change (doppler effect) 2) By the intuition...
  30. Q

    Solve Pin Jointed Frame Q1: Evaluate Reactions, Calculate Forces

    Hey Guys, I've got a pretty simple (I think) pin joint frame question. I am pretty weak in this area of mechanics so if someone could advise me on how to go about doing this question i would really appreciate it. The Figure Q1 (The Attatchment) shows a pin jointed frame. The frame is...
  31. D

    What Happens When a Ball Hits a Moving Wall?

    Problem If you throw a ball with velocity v at a wall, it rebounds with the same speed, v. What happens if you throw it at speed v towards a wall which is traveling towards you at speed w? What is your answer in the limit in which w is much larger than v? Answer Let us work in the frame of...
  32. E

    MATLAB Can You Implement a Rollback Feature in a MATLAB Program?

    Hi, I have been working on a MATLAB program for solving the member forces in a 2d frame structure which many people have helped me out with on this forum. I have finally got the script to a point where it is working ok and have shown the command window output for a solving a simple frame. My...
  33. J

    Lab frame versus center of momentum frame

    Why is it conventional to analyse compton scattering in the lab frame (fixed target) whereas all other processes I've seen are analysed in the center of momentum (colliding beam) frame. Are there any experiments where one would collide electrons with stationary muons e.g.?
  34. putongren

    Newton said that all frame of reference are equally valid

    I'm not sure if either Einstein or Newton said that all frame of reference are equally valid. That from my point of view, the laws of physics is the same from your point of view. All frame reference can be put on an equal footing. I was wondering, can one consider the geocentric view that the...
  35. S

    Does the Cosmic Background Radiation Provide an Absolute Frame of Reference?

    According to Einstein, there is no absolute frame of reference; no such thing as 'absolute rest'. But does not the Cosmic Background Radiation provide an absolute frame of reference? An object for which this radiation is totally isotropic is at absolute rest; I gather we move relative to it at...
  36. U

    Pervect's discussion re photon/light perspective/reference frame

    Hi Pervect, You concluded the thread titled “Another question about photon perspective, concerning entanglement” initiated by Anticitizen with this post: You also concluded the thread titled “Reference frame of Light” initiated by Klotz with this post: I am having difficulty...
  37. V

    CG of Rectangular Frame with Offset Weight: Need Counterweight?

    Hi, I had a question on CG. I have a rectangular frame (say made of square tubes) and have a weight fastened to its lower arm (as shown in the attached pic.), which is not fastened on the center of the lower arm but is offset. however, the CG of the weight is in the same line as the pick...
  38. S

    What is Ann's final position in different reference frames?

    Hi, I'm quite new to relativity and I'm just going through some problems from past exam papers to prepare for an upcoming subject. The following question has me a little stumped: Betty is at the origin of her frame of reference. At a certain point in time, this also corresponds to the...
  39. J

    Definition of an Inertial Frame

    Is there some way to define an inertial coordinate system without being cyclical (defining it with terms that require an inertial coordinate system to define)? For example if you refer to straight lines... straight according to what coordinate system? Or if you refer to velocity... that...
  40. H

    Defining Inertial Reference Frames in General Relativity

    How can you have an inertial reference frame in which a body can remain at rest or move with constant velocity unless you postulate the disappearance of the universe? In the Michelson Morley experiment the Earth is not moving with constant velocity, it is accelerating. So the postulates of...
  41. stevebd1

    Black holes, frame dragging and the effect on gravity

    In regard of frame-dragging within the ergosphere of a rotating black hole, what effect would this have on gravity? It seems accepted that with frame dragging (or lense-thirring), the fabric of space is dragged around with the black hole but that light within the ergosphere still travels at...
  42. J

    Centre of Mass frame of colliding molecules

    I'm not sure this is the right place to post this question but here goes: In feynman vol.1 39-9 there is a situation where two molecules are about to collide in a CM frame, the frame has velocity Vcm and the two molecules have respective velocities v1 and v2, then there is no correlation...
  43. E

    How Large Must a Spark Chamber Be to Qualify as an Inertial Frame?

    I am reading Taylor and Wheeler's Spacetime Physics. I am enjoying it a lot and find it extremely readable but I have a question regarding something. I am not sure how to determine the dimensions of a frame necessary for it to be called a free float frame. This is a general question I know. To...
  44. N

    Discuss events which are simultaneous in one frame?

    I have scanned the simultaneity related posts and cannot find a succinct answer to a question I have - I accept that the answer is probably buried in one or more of them. My question is related to the common claim that you somehow lose simultaneity in relativity, or that the idea of...
  45. J

    Zero Momentum Frame Explained: 2D Collision Problem

    Could anyone quickly explain how the zero momentum frame works in 2 dimensional collision problems? I really don't understand at all. Thanks
  46. T

    Particle in non-inertial reference frame

    Homework Statement particle moves in a xy plane, force F is actiong on it, proove that there exists a frame rotating with angular velozity w.z in which the equations of motion of this particle will be x''=2wy' y''=2wx' Homework Equations m-mass xy-plane in which object moves F=-kr k=constant...
  47. Astronuc

    Air Frame Life Extension - F-15 Problem

    Structural integrity is a significant matter for aerospace engineers. The Air Force is apparently investigating the possibility that Boeing is liable for the structural "defect" in F-15's. Life extension is a critical matter in aerospace and nuclear industries as highly engineered systems...
  48. M

    Simple pendulum: does the period change in a horizontally accelerating frame

    [SOLVED] Simple pendulum: does the period change in a horizontally accelerating frame Homework Statement Simple pendulum which is 5.0m long. What is its period when it is in a truck accelerating horizontally at 5.0m/s/s? Homework Equations w = sqrt(g/d) w = 2pi/T The Attempt at a...
  49. W

    What would the universe look like from the perspective of a photon observer?

    According to Einstein's relativity theories, each observer is afforded a frame of reference which can be considered central and stationary. What would the universe look like to the frame of reference associated with a photon observer. Would all things be moving past the photon at the velocity...
  50. E

    Remote Controlled Car frame design

    hello! I am an engineering student and am participating in a RC Car raacing comp in my college. The comp requires us to contsruct a RC car using either DC motors or miniature IC engines (4cc-6cc). The track will have many obstacles like sand pits, oil spills etc. The objective is to complete...
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