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. DiracPool

    Speed of light in acclerated frame

    I've been hunting around online but have found only long-winded explanations of the speed of light in non-intertial or accelerated reference frames, which mostly relate to gravity. I'm looking for just a straightforword treatment dealing more specifically with traveling acceleration and not...
  2. N

    Latest high frame rate consumer priced video cameras?

    I'd like to get images at a frequency of at least 100 frames/sec to measure servo arm speeds (including acceleration from rest) under various torque loads. This is for personal research associated with RC helicopter accessories, but as a high school physics teacher it seems it would be good for...
  3. S

    How did the CMB Lorentz frame get chosen?

    The cosmic microwave background is anisotropic: the temperature is distributed as a dipole with the temperature at the poles differing by ±0.00335 K from the mean. This defines a Lorentz frame: we can boost by several hundred km/s to make the dipole vanish, on average. This new frame could...
  4. A

    Changing the Hamiltonian to a new frame of reference

    Suppose I'm considering particles of mass \mu_i, 1 \leq i \leq 3, located at positions r_i. Suppose I ignore the potential between \mu_1 and \mu_2. Then the Hamiltonian I'd write down would be H = -\frac{1}{2\mu_1}\Delta_1 -\frac{1}{2\mu_2}\Delta_2 - \frac{1}{2\mu_3}\Delta_3 + V_1(r_3 -...
  5. O

    Momentum of Object in 0.6c Inertia Frame

    The momentum of an object(when it collide with another object in a rest frame) in a inertia frame of 0.6c relative to a rest reference frame. The momentum is p=γmv. where γ= 1/√(1-β^2) m= the mass of an object at the rest frame v=?? v is the velocity of the moving frame relative to the...
  6. C

    Time in the reference frame of the photon and aswell curved spac

    Time in the "reference frame" of the photon and as well curved spac Hi there! I understand the tendency of physicists to stick to the math, and the logic itself, and to often avoid attempting to conceptualize a process or law, but that's kinda the opposite of what I'd like to do here. I...
  7. W

    Can anyone explain the use of inertial frames for problem solving in E&M?

    Can anyone refer me to a discussion of applying the technique of changing reference frames to problem solving? Why it works, and what it means. I'm familiar with using it in some E&M problems, but I guess I don't really "get" it. For example a particle in an E&M field has m\vec{a} =...
  8. M

    Frame drag to accelerate spaceships?

    As far as I understand, a spaceship going around rotating black hole should gain additional acceleration due to frame drag. Right? So, would there be max speed gain, like in gravity assist, or could you accelerate infinitely? Thanks.
  9. S

    Speed of light measured in/by a parallel frame moving at c

    Scenario: Alice is "sitting" on photon A Bob is "sitting" on photon B both are moving in same direction, their paths are parallel to each other. Per relativity the speed of light is constant So Alice will measure Bob's speed to be c and Bob will measure Alice's speed to be c yet they are...
  10. D

    Special relativity from the frame of refrence of photon

    we know that particle having rest mass cannot reach speed of light,c. but if we apply results of special relativity to a photon,then it seems that for a photon 1)there is no time and 2)length is contracted to zero. 1) so does that...
  11. W

    Change frame of reference to simplify acceleration calculation?

    I'm working problem from the upper division classical mechanics course on MIT OCW. No solutions are available. This is form the first P-set, question 4. Homework Statement A particle moves in a two dimensional orbit defined by x = A(2αt-sin(αt)) y = A(1-cos(αt)) Find the tangential...
  12. K

    Definition of Inertial Frame in GR: Math Explained

    How do we mathematically define a inertial frame in GR? Is it only a basis in some tangentspace or does it have to be induced by a coordinatechart? :/
  13. E

    No privileged frame of reference

    As I understand it, Einstein's dismissal of the "luminiferous aether" was based on his discovery that there is no universal frame of reference, i.e. that no frame of reference is privileged in relation to all other frames. My question is whether this principle can also be stated in the inverse...
  14. B

    Does the Universe have a Frame Rate ?

    Does the Universe have a "Frame Rate"? Surely, thinking about it, things can't just smoothly transpose from one location to another, there must be regular gaps, (far to quickly for us to notice) where it "jumps" from one point in space to another. I think this because it seems hard to imagine...
  15. A

    Inertial Reference Frame Locally

    Why can we not CHOOSE a reference frame locally and treat everything inside of it as an inertial reference frame. For example in a classroom, the classroom is moving with the Earth and so is a ball rolling down the class. Because they are both equally moving due to the Earth's rotation, why...
  16. B

    Frame of reference question about equivalence principle

    I've been giving some thought to the new scientist article about the equivalence principle. What initially seems like a very simple issue is remarkably tantalising. (please note- I'm not a physicist so this may be quite stupid) This led me on a little to the question of gravity and direction...
  17. S

    Showing a given set of vectors forms a Parseval frame

    Homework Statement Show that the vectors ##\sqrt{\frac{2}{3}}(1,0), \sqrt{\frac{2}{3}}\left(-\frac{1}{2},\frac{\sqrt{3}}{2}\right), \sqrt{\frac{2}{3}}\left(-\frac{1}{2},-\frac{\sqrt{3}}{2}\right)## form a Parseval frame of ##\mathbb{R}^2##, but are neither linearly independent nor...
  18. H

    Force exerted over a small time and big time frame

    Hi Why is it that if you hit an object fast it requires less force to break it than if you hit the object slow and applied pressure to it?
  19. T

    Does light have a frame of reference?

    I know that you're going to probably say that a frame of reference doesn't make sense for light, but I've uploaded a discussion (warning: has profanity) from another website (reddit.com) and I'm curious to see if the user Imhtpsnvsbl makes a valid point.
  20. H

    Validity of Newton's 2nd Law in accelerating ref. frame and constant v.

    First of all I'm not sure if this is the right forum for this problem. Homework Statement Given that \overline{F}=m\overline{a} is valid in the lab frame S, show that: (a) it is also valid in a moving frame S' with a constant velocity relative to S, but (b) invalid in a moving frame with...
  21. P

    Reference frame to calculate centroids

    Hi. I was recently calculating some centroids and I was wondering if the point were I choose my origin affects the centroid position. I.e., if I choose my origin at a massive particle, will the centroid be the same as with any other reference frame? Thansk :)
  22. G

    A SR experiment in which an entity exists in frame A but not frame B

    This paper by Cacioppo and Gangopadhyaya deals with two variations on the Pole and Barn paradox. Both paradoxes are successfully resolved. However, with regard to the first paradox, an electromagnetic wave comes into being in one frame, but not in the other. I consider this to be a paradox in...
  23. M

    What exactly is an inertial reference frame?

    Due to my job and other classes, I've been studying ahead of my class by myself to not fall behind and I'm not sure if I'm oversimplifying this in my head and not really grasping the idea. Newton's First Law of Motion states that an object with a net force of zero stays in constant motion (or...
  24. C

    Can Earth be considered an inertial reference frame?

    hi guys, i have a basic question on special relativity.. if the inertial reference frame denotes the frames that holds up the Newtonian 1st law, then can Earth be an inertial frame? i mean it changes direction of velocity as it moves in the orbit around sun, so its not in constant velocity ...
  25. J

    Rutherford cross section in CM frame

    Hi I need to plot the (differential) Rutherford cross section as a function of the scattering angle in the CM frame. the reaction is a typical projectile on stationary target. I know the projectile energy in the lab, θcm and the masses. I am confused over which energy to use though. I know...
  26. Z

    Max Velocity of Electron in Pion Rest Frame: Homework Solution

    Homework Statement A pion in its rest frame decays into a muon and a neutrino. Find the velocity of the muon and its mean-lifetime in the pion rest frame. (I've done this part). The muon decays into an electron and two neutrinos. If the two neutrinos happen to travel in the same direction...
  27. P

    MHB Proving Regularity of M(s,t) and Deriving the Unit Normal Vector Field N(s,t)

    let y:R^3->R^2 unit speed curve of nonvanishing curvature and let its scalar curvature,torsion and Frenet frame be denoted κ, τ and [u,n,b] respectively. You may aassume the frenet formulae are true. Let M(s,t)=y(s) +tb(s). 1)Show that M is regular surface. Partial derivatives are...
  28. T

    Defining Special Frame: Math & Limitations of Preferred Frames in BM

    This is to understand about the mathematics and possible limitations of the concept of preferred frames in BM and why entanglement couldn't use one. Supposed you have a cruise missile sent out from Earth to a distant planet traveling at 0.99999 the speed of light. 30 Seconds after sending it...
  29. D

    Can Something Travel Faster Than Light in Different Frames of Reference?

    hello, in relativity something can go faster than the speed of light as long as it is not in the observer's frame of reference which would say that a FOR has a size but i read that a FOR was infinite in all directions. Someone explain this contradiction please!
  30. C

    Can we describe the physics of a photon in an inertial reference frame?

    I know that the rest frame of the photon is a non inertial reference frame. In that sense obviously the physics will not be Lorentz co-variant and so on. I have the following question Is possible to define a coordinate transformation from an inertial reference frame to the rest frame of a...
  31. G

    Formation of accretion disk / frame drag

    came across the concept of Frame dragging. i cannot find if this phenomena also aids in addition to the conversation of angular momentum the formation of an accretion disk around neutron stars/black holes. cheers
  32. A

    Can Light Be the Perfect Reference Frame to Solve Problems of Reference Frames?

    We have a problem of perfect reference frames( according what we are taught in school) If universe is expanding, the so called fixed stars are also moving. According to the special relativity, the speed of light is constant in every reference frame, So if we let light as the perfect reference...
  33. A

    How Do Position Vectors Differ in Inertial and Rotating Frames?

    Homework Statement Homework Equations Frotating = Finertial + Fcor + Fcf The Attempt at a Solution For the inertial field: F = -qv x b -kQq/r2 For the rotating field it would be the same term plus the coriolis and centrifugal forces. The issue I'm having trouble with is this: The v...
  34. S

    Can inertial reference frame have different sizes at least in theory?

    hi can inertial reference frame be in different sizes at least in theory? i mean that can there be two different frames of reference in same place at same time, where the observer in both frames observes physical laws to be normal in their own frame of reference, but the other frame appears to...
  35. S

    Rest frame angular distribution of meson decay into two photons

    Homework Statement consider a pion decaying into 2 photons. In the rest frame of the pion, the two photons must emerge back-to-back photons are equally likely to emerge in any direction. determine the rest frame angular distribution of the emerging photons. Homework Equations ΔP=f(θ)Δθ is...
  36. P

    Surface tension of a liquid layer within frame with elastic wire

    Hi, Homework Statement A square frame with a thin crust/layer of liquid with surface tension γ is given. Into the plane of the frame an elastic wire of circular shape with radius r_0 is inserted. The thin crust/layer of liquid is then burst (by pricking) and as a result of the force of...
  37. J

    The electromagnetic field in an accelerated frame

    Imagine a stationary charge q located on the positive y-axis at a distance r from a stationary observer at the origin. Let us assume that the distance r is large enough such that the electrostatic field due to the charge is negligible at the origin. Now let us assume that the charge q is given...
  38. A

    Change of Schrodinger equation when we change frame of reference

    Hi! I think this should be a fairly easy question to resolve, but it's currently giving me fits... Suppose we consider a system of three interacting particles where we assume two of the particle (at positions r1 and r2) have infinite mass (such that we can ignore their kinetic energy) and do...
  39. S

    Why we have to tap the frame during Deflection of Beam Experiment?

    hi, last week we did an experiment to find the deflection of simply supported beams. During the experiment, after every measurement we had to tap the frame slightly. Does anyone know why we had to do this? If you could explain it to me I would be grateful.
  40. B

    Calculate Frenet Frame for \vec{r}(t)

    Homework Statement calculate the frenet frame for the vector: \vec{r}(t)=(2t cost,2tsint,5t) calculate the acceleration in frenet frame. Homework Equations \hat{T}=\frac{dr}{ds}=\frac{\dot{r}}{|\dot{r}|} \hat{N}=\frac{\frac{dT}{ds}}{|\frac{dT}{ds}|} \hat{B}=\hat{T}\times \hat{N}The Attempt...
  41. B

    Different times Reference Frame Question

    Homework Statement In a given reference frame, event 1 occurs at t1 = 0 s and position x1 = 0 m while event 2 occurs at t2 = 3.6 × 10^−4 s and x2 = 0.60 × 10^5m. Is there a second reference frame in which these events could be at the same place but different times? If so, specify its motion...
  42. R

    [SR] - Photonic Reference Frame

    Recently learned about Special Relativity, so my brain is running perpetual circles around itself asking questions. So, I figured I would come here and ask where could I find out more information about the Lorentz Factor being undefined at a luminal velocity? Or more basically, where do I...
  43. J

    Manufacturing metal sheets of a car frame

    I saw this video of BMW car manufacturing plant on YouTube, and they showed how the robots fix metal sheets of various shapes onto the main frame ("skeleton") of the car. I was wondering: How to they make those metals in those particular shape. On one side there is the frame work, and the...
  44. B

    Integration when transform to center of mass frame

    Hi, I am having some difficulty doing the integral ∫d^{3}v1d^{3}v2 | \overline{v1}-\overline{v2}|, where u1\leq|v1|,|v2|\lequ2, and \overline{v1} means vectors. It seems better to evaluate it in the center of mass frame, by substitution \overline{v1}+\overline{v2}=\overline{V}, and...
  45. phosgene

    Show that c^2(t^2) - x^2 - y^2 - z^2 is invariant under a change of frame

    Homework Statement Show that the quantity T = c^2(Δt)^2 - (Δx)^2 - (Δy)^2 - (Δz)^2 is invariant under a change of frame Homework Equations Lorentz transformations Δx' = \gamma(Δx - vΔt) Δt' = \gamma(Δt - vΔx/c^2) Δy' = Δy Δz' = Δz The Attempt at a Solution I know that the way to do...
  46. S

    Does an Orthonormal Frame Exist on a Surface with a Riemannian Metric?

    Let $$M$$ be a surface with Riemannian metric $$g$$. Recall that an orthonormal framing of $$M$$ is an ordered pair of vector fields $$(E_1,E_2)$$ such that $$g(E_i,E_j)=\delta_{ij}$$. Prove that an orthonormal framing exists iff $$M$$ is orientable and $$M$$ admits a nowhere vanishing vector...
  47. F

    Is frame dragging the same as torsion?

    Is frame dragging in GR the same as torsion in curved spacetime?
  48. S

    Cause and Effect Without Frame of Reference

    Before I say anything, I don't really have any experience in physics. But this question just popped into my mind concerning cause and effect and I can't seem to find the answer to it on the web. Here it is...Are cause and effect the same thing if a frame of reference is not present? For...
  49. M

    Frame Dragging & Galactic Rotation: Implications for AGN & Black Holes

    Hi, I am interested in the issue of frame dragging used in a number of galactic rotation models. However, I wanted to first make sure that I have a better understanding the relativistic implications of frame dragging. While the issue of galactic rotation is not the subject of this thread, it is...
  50. C

    How to start a proof that shows that proper mass is the same for S and S' frame

    Homework Statement As the title of this post suggests, how does one show that the proper (invariant) mass is the same for two reference frames where the S' frame is moving away from the S frame at a velocity of +v. Note that this is a two mass system of m_1 and m_2 with speeds of u_1 and...
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