What is Frame: Definition and 1000 Discussions

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. A

    How to derive the curl of E equation in the frame of the conductor?

    According to wikipedia, "The moving magnet and conductor problem", I stopped at the equation shown in the attachment. It said that the curl of the E` ( electric field in the frame of the conductor) is equal to minus of the dot product of the velocity of the conductor and the del multiplied by...
  2. A

    Deviation of compass in another frame

    Consider an inertial frame where an electric current is flowing in upward direction, a magnetic field is created and its direction is determined by the right hand rule. In the frame of reference of the electric charges which they are at rest, how can the observer in that frame explains the...
  3. C

    How the two-body decay momentum distribution transform in lab frame?

    For two-body decay, in the center of mass frame, final particle distribution is, $$ W^*(\cos\theta^*,\phi^*) = \frac{1}{4\pi}(1+\alpha\cos\theta^*) $$ We have the normalization relation , ##\int W^*(\cos\theta^*,\phi^*)d\cos\theta^* d\phi^*=1##. And we also know that in CM frame ##p^*##...
  4. M

    Velocity of light and it's frame of reference.

    If light has a maximum speed of c, what frame of reference is that speed determined from? For example, if you were to turn on a light bulb moving at a constant rate and measured when the light in every direction got to one light year away from it's source, wouldn't some of it reach that...
  5. P

    Non-Convex Coordinate Transform Problem Rotating Frame

    I am sure this is not the best description of the problem, so let me know how I can clarify. Say there are 2 coordinate systems, with one orbiting around the other. Call one fixed ƒ and the other rotating ρ. The goal is to find the transform between the two frames. What's known is 1) A...
  6. N

    Rotating reference frame help

    Homework Statement I have attached the problem as a picture on this post, am really really unsure on how to start! so far the only thing i can think of doing is using this equation (\frac{d^{2}r}{dt^{2}})_{s} = ( \frac{d^{2}r}{dt^{2}})_{s'} + 2ω \times (\frac{dr}{dt})_{s'} + \dot{ω}...
  7. P

    Rotating frame: a question of interpretation

    I'm reading Lanczos: 'The variational Principles of Mechanics'. I need help resolving a paradox - which is probably trivial… Lanczos (page 100 Dover edition) introduces a system, S', rotating at angular velocity \vec \Omega about an axis through a fixed point with respect to inertial system...
  8. C

    Frame Question: Trouble Solving Structural Members

    Hi! I am having trouble with this frame. To make a long story short, I did the problem and got the right answer. The issue is that when I wanted to try solving the problem by exploding the structure into individual members, I couldn't get an answer anymore and it's bothering me because I do not...
  9. J

    Do Frame Dependent Charges Radiate?

    Let's say there's an electric current in a neutral loop of wire. Then we change to a frame where the loop is moving. That makes the loop an electric dipole, for us. Then somebody shakes one side of the loop, the positive side for example. Do we observe EM-waves? Here's a picture of the loop...
  10. M

    Inertial Frame of Reference: Why Space Selects a Non-Inertial Frame

    Why does one particular 'frame of reference' have fictitious forces (like inertia) whilst another one doesn't. I understand the basics, but more interested in 'why' space seems to have magically chosen specific frame to be the 'non inertial frame'. Could space be more absolute than we...
  11. H

    Two particles, constant acceleration in their own frame

    Greetings, I'm having some issues with a problem that I is related, though not identical, to Bell's spaceship paradox (this is not for a homework or anything, it just sort of occurred to me when I was thinking about something else). Consider two particles that are initially at rest in some...
  12. L

    How would you define an inertial frame of reference?

    I've researched about it and watched a few videos, but I can't seem to get my head around it. Would saying that "it's a marker that is fixed relative to your position, in which Newton's first law holds" be an accurate way to define it?
  13. A

    Reaction Forces on a Frame With Roller Joint and Pin Joint

    [b]1. Hi, The problem: A roof support frame has various leadings on it. The frictionless pin joint at points A has vertical and horizontal reaction forces. The rollers at point B allow free movement in the horizontal direction and has a vertical reaction. a/Calculate The total Horizontal...
  14. A

    Problem - Lagrange function for mass on springs attached on a frame

    Hello! I have a problem in classical mechanics that I'm unable to solve. Any help would be much appreciated since we have a partial exam tomorrow. :( Homework Statement There's a picture of the problem in the attachment A mass m, which is on a light rod (lenght d), is attached to a...
  15. WannabeNewton

    Quick question on CMB anisotropy in Earth frame

    Hi guys. Consider the mean occupation number and specific intensity of the CMB photons in the CMB frame as given by the blackbody formulas: ##\eta = \frac{1}{e^{h\nu/k_{B}T_0} - 1}## and ##I_{\nu} =\frac{2h\nu^3}{e^{h\nu/k_{B}T_0} - 1}## with ##T_0## the thermal bath temperature in the CMB...
  16. S

    What is a pseudo-force and how does it relate to non inertial reference frames?

    So I was told that a pseudo-force acts on a body when its's motion is analysed with respect to a non inertial reference frame. I'm a bit confused. Does that mean the reference frame is accelerating with respect to the body, or with respect to the earth? And why does there have to be any sort of...
  17. A

    What is the recommended maximum deflection for a bicycle frame test using FEA?

    I'm working on a group project where we test a bicycle frame on ABAQUS. The test is as follow Where F is a static load. It was suggested for us to consider it as 4G*120kg to simulate a laboratory test. We're having a hard time knowing what is the maximum deflection (or stifness) we should...
  18. C

    Zero-momentum frame - total momentum in this frame

    Homework Statement Assume that all particles are non-relativistic, that the target X is initially at rest, and that x has kinetic energy Tx in the laboratory frame. Show that the total kinetic energy of the reactants in the centre-of-mass frame is given by T* = μTx/mx, where mx is the...
  19. U

    Recovering a frame field from its connection forms

    Hi, I have a faced a research problem where I would need to recover a frame field given its connection forms. More precisely, I begin with an orthonormal frame field (given by data) in \Re^3 written as \mathbf F=\begin{pmatrix}\vec f_1\\\vec f_2\\\vec f_3\end{pmatrix} where \vec...
  20. P

    Lift and Drag Which frame of reference?

    Lift and Drag...Which frame of reference? Hi, When expressing the Lift and Drag acting on an airplane as: F_{lift}=qSC_L F_{drag}=qSC_D where q is the dynamic pressure, S is the wing ref. area, and C's are the lift and drag coefficient. My question: Some sources, like this one...
  21. H

    Proving the Uniqueness of Center of Momentum Frame

    Hello again, Two days ago, I started a thread asking about the same question more or less, and I was thinking that the matter was clear now in my mind, because I had made an error in my calculations... Before I begin, I want to admit that my English is not very good, and my exposition to...
  22. A

    Defining a rest frame in the real world

    Hey guys, as we know the concept of the rest frame is one of the most famous concepts in any kind of relativity, because it must be known in which frame the body is at rest. My question is how do we define a rest frame on a solid object that has atoms vibrating, the body clearly does not have...
  23. P

    What time do simultaneous events in rest frame occur in moving frame?

    Homework Statement A train is moving by a stationary observer, Bob, at 0.8c. An observer standing still in the middle of the train, Alice, measures the distance to each end of train as 9*10^11 m. Two lightning bolts hit each end of the train simultaneously, as seen by the observer at the...
  24. Wes Tausend

    Fundamental Valid Frame of Rest

    ... Three scientists are familiar with Special Relativity and it's rules. The three scientists decide to conduct a Special Relativity experiment. The plan is for two of them to get into two separate rocket ships and pass one another nearly head-on overhead while the third scientist...
  25. H

    Constant Jacobian transformation of an inertial frame

    Suppose we do a constant Jacobian transformation (which is not Lorentz) of a SR (inertial) frame, by using four linear change of variables equations. This defines an apparent field with a constant metric (which is not the SR metric) in which there is relative acceleration of separation. From...
  26. bcrowell

    If stress vanishes in one frame, it vanishes in all frames, but

    This paper discusses the Bell spaceship paradox: Petkov, "Accelerating spaceships paradox and physical meaning of length contraction," http://arxiv.org/abs/0903.5128 PF has a FAQ on this paradox: https://www.physicsforums.com/showthread.php?t=742729 My purpose in creating this thread is *not*...
  27. A

    Centre of mass frame in nuclear reactions?

    I'm slightly confused as to how we discuss centre of mass frames in nuclear reactions. We have the reaction a(A,B)b. Before the reaction we can transfer to the centre of mass frame v_c = \frac{\sum m_i v_i}{\sum m_i} and note that the total energy before the reaction is E_{CM} =...
  28. J

    Rotation relative to an inertial frame

    Earth has a huge angular velocity regarding its rotation. Now let's imagine that the Earth has the velocity of 400 km/s relative to some inertial frame. What will be the velocity of Earth when we take the rotation into account combined with inertial motion? How do the 2 combine? Thanks in...
  29. S

    Reactions of a redundant frame structure using Unit Load Method

    Homework Statement Hi, I am having trouble with the following problem and I can't seem to find any examples: I am trying to determine reactions at points A and D of the redundant structure below using the unit load method, there is a 10kN load at the top left point (B), all lengths are...
  30. P

    Calculating the loads at different points on a base frame

    The attachment provided shows a frame in which a large fan is to be rested on. The fan has a weight of 6,060 kg and the location of the centre of gravity is shown in the attachment. I would like to know how to calculate the loads at each point. Could anyone please provide some help on this problem?
  31. A

    Accelerated Rest Frame: Time Flow Explained

    I was reading some posts on one of my previous threads (great discussion there btw) and I red something that I really didn't understand. So the basic premise was that if we have 2 clocks that undergo acceleration on the same level, to that they are mutually at rest, that they will see their...
  32. P

    Measuring parallel velocity in rotating frame.

    Homework Statement At t=0 a police officer is located at (0,R) on a circular platform whose radius is R and which rotates around the z axis with constant angular velocity ω. The officer's velocity at that point in time is (ωR ,0). At that time, a bird leaves the center of the platform along the...
  33. R

    Time Dilation Observed in Relative Frames: A Simple Question

    There are only two frame moving relative with each other at certain velocity. One frame see the other going right and the other to the left. Isn't it contradict that each see the other time running slow and both are correct? And this isn't the case , where one twin leave Earth and each see...
  34. E

    Does General Relativity Theory Account for Accelerating Frames?

    I thought that one of the features of GRT was to allow for ACCELERATING reference frames. Yet none of my textbooks seem to show any examples of this. Even the Kerr metric, for a rotating black hole or mass, seems to be "inertial" in the translational directions. (1) Is all that correct...
  35. N

    Proper time of an accelerated frame in a external gravitational field

    hi everyone. I'm having trouble understanding the concept of proper time in general relativity. suppose we have some metric given by a fixed mass distribution, say schwarzschild or something (it's not important) and a test particle go over some path between two events A and B. if we want...
  36. Entanglement

    Galvanometer Frame: Aluminum Advantages

    Why is the frame in galvanometers made if aluminum ??
  37. R

    Derive the terrestrial equation of motion in the body-fixed frame

    Homework Statement Assume that the center of mass of the Earth moves with approximately constant velocity with respect to the fixed stars, and that \mathbf{\omega}, the angular velocity of the earth, is constant. Rederive the terrestrial equations of motion...
  38. L

    Transformation to local inertial frame

    I've been working on a problem that I can't seem to get started on. Here is how it is posted: Metric of a space is: ds^2 = (1+2\phi^2)dt^2 - (1-2\phi)(dx^2+dy^2+dz^2), where |\phi | << 1 everywhere. Given a point (t_0 , x_0 , y_0, z_0) find a coordinate transformation to a locally...
  39. T

    Twin paradox without accelerative frame.

    I've asked this question a few times. This time i have tiny change in the question. Instead of people I'm using stopwatch & i have removed the accelerative frame. If you have any doubts I'll clear it but do not skip the topic. All i want is an answer that can be agreeable for all...
  40. G

    Is the W boson in this decay a vector boson based on parity nonconservation?

    Homework Statement "(a) Draw a quark-flow diagram for the weak decay \pi^{-}\rightarrow\mu^{-}+\overline{\nu_{\mu}} . Explicitly include the appropriate intermediate vector boson. (b) By considering the production of \mu^{-} and \overline{\nu_{\mu}} in the rest frame of the vector boson...
  41. Saitama

    Bug on a hinged square metal frame

    Homework Statement A square metal frame in the vertical plane is hinged at O at its centre as shown in the figure. A bug moves along the rod PN which is at a distance ##l## from the hinge, such that the whole frame is always stationary, even though the frame is free to rotate in the vertical...
  42. M

    Analyzing a Multi-storey multi-bay frame subjected to lateral load

    What is the best/easiest method I can use to get the deflections of a 5-storey, 3-bay frame subjected to lateral loads only? I've used the Elemental stiffness matrix for two-dimensional frame analysis (giving me a 60 x 60 matrix) but I'm getting the wrong deflection values. I think my procedure...
  43. D

    Frame of reference in a simple harmonic motion vertical spring

    I have doubts of how can I put my frame of reference in a simple harmonic motion vertical spring. Normally the books choose the origin in the equilibrium position and the positive distance (x>0) downward, and in this conditions Newton´s second law is: ma=-kx; but instead of putting the positive...
  44. P

    3 Pinned Frame - Produce Calcs, BMD & SFD

    I have to provide calcs and then produce Shear Force Diagrams, Bending Moment Diagrams. I,ve completed it but I think I,m going wrong somewhere. The diagrams do not look correct. I suspect I,ve possibly got positive/negative values mixed up somewhere through it but I,m not totally sure. Any...
  45. F

    Finding CM frame velocity in special relativity

    Homework Statement An electron of energy 10 GeV strikes a proton at rest. What is the velocity of the electron-proton CM system? What energy is available to produce new particles? Homework Equations Conservation of momentum and energy, E2=p2c2+m2c4 The Attempt at a Solution...
  46. sergiokapone

    Moving in an non-inertial frame

    Homework Statement In opposite points carousel diameter D = 20 m, rotating with constant angular acceleration, located at the point C shooter and target M. Shooter aiming at a target without introducing amendments to the rotation of the carousel. What should be the angular acceleration of...
  47. P

    Equilibrium equation for a frame

    Homework Statement http://postimg.org/image/scm11r483/ So when considering the free body diagram for member BE, why is the force P not included? Does the Ex account for the bit of the P=210 that would act on member BE?
  48. M

    Basic non-rotating accelerating reference frame problem

    Homework Statement A uniform thin rod of length ##L## and mass ##M## is pivoted at one end. The pivot is attached to the top of a car accelerating at rate ##A##. What is the equilibrium value of the angle ##\theta## between the rod and the top of the car? Homework Equations None in...
  49. P

    Lorentz Transformation of Vectors from S to S' Frame

    Homework Statement The question is quite basic; what is the Lorentz transformation of the follows 4-vectors from S to S' frame: A photon (P) in S frame with 4-momentum P = (E/c,p,0,0) and frequency f where hf = pc = E. h is the planks constant, p is the magnitude of 3-momentum...
  50. L

    Pendulum in non inertial frame

    Homework Statement A pendulum is placed on a rotating platform which rotates with angular velocity ω around an axis, at equilibrium the angle between vertical and pendulum is θ θ= 20 degrees ω= 10 1/s how far is the pendulum placed from the axis Homework Equations...
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