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. L

    Is Velocity Constant in the Instantaneous Rest Frame?

    I have came up some question asking the velocity change of the rocket in its instantaneous rest frame. And I have been taught that in the instantaneous rest frame, v=0, dgamma/dt =0, gamma = 1. if v is always zero, how come to talk about the change in velocity? Thanks in advance
  2. P

    Frame of reference of any observer

    Let's consider flat 4D Minkowski spacetime. Is it possible to define (local) coordinate system for any observer (its natural reference frame) so that these coordinates posses interpretation of time and spatial position measured by this observer? It can be done in two dimensional Minkowski...
  3. J

    Newton's Law Problem, involves n-t frame or r-t frame

    After picking up passengers, a train accelerates uniformly until its speed is 100 km/hr at t= 300 s. If during this time it is traveling on a planar path that approximates the circle and line shown in the figure, find the magnitude of the train's acceleration when (a) t = 1 min and (b) t = 2...
  4. J

    3d projectile motion, with rotating reference frame

    Homework Statement I'm using MATLAB show the path of a projectile fired directly up(directly out from the center of the earth) from 41 degrees north latitude. Air resistance, variation of gravity cause by height, and the centrifugal force are for now ignored. What I'm trying to figure out...
  5. B

    Acceleration in an accelerated reference frame? Yes/no/maybe?

    Hi, my question is this, say you’re in a lift that is accelerating downwards at 5ms and you were to drop a 200g wallet from say 1.3m off the floor of the lift, assuming gravity is 9.8ms, how long would it take the wallet to hit the floor of the lift? Does the downwards acceleration of the...
  6. B

    Relativistic CM frame Kinetic energy

    Now then, this is a past paper question for only 3 marks but its annoying me. 2 identical spheres undergoing an elastic relativistic collision. The spheres move with a speed such that their CM frame kinetic energy is equal to their rest energy. Calculate the speed the spheres in the CM...
  7. fluidistic

    Calculate Particle Velocity/Accel in Referential w/ Motion & Coriolis Problem

    Problem: Calculate the velocity and acceleration from an inertial reference frame of a particle whose motion functions (in Cartesian's coordinates) are known from a moving referential. The motion of such a referential is in accelerated translation and rotation with respect to the inertial one...
  8. A

    What is the Reference Frame for Rotational Motion?

    we generally study the concept of Inertial reference frame in case of translation motion (for non-accelerated frames) what happen if motion is rotational?
  9. A

    Inertial reference frame for 2&3 law

    Does the concept of Inertial reference frame also applicable for 2nd & 3rd law of motion?
  10. S

    Is the Frame Dragging Effect Measurable on High-RPM Massive Rotating Discs?

    Hi just a quick question, I've been searching online to find out if there is any measurable frame dragging effect on a high rpm massive rotating disc, but havnt been able to find anything. I've read a bit about gravity probe B but in my limited understanding of the effect and the physics around...
  11. J

    Why no privlidged reference frame?

    I'm not a physicist and not a mathematician. I just want to understand things, and have read "advanced layman" books. It's often touted that Noether's theorem shows that the uniformity of space (the same everywhere; no preferred origin) implies conservation of momentum. More properly, the...
  12. I

    Transform TT gauge -> orthonormal comoving frame (MTW 35.5)

    Homework Statement Introduce a TT coordinate system in which, at time t=0, the two particles are both at rest. Use the geodesic equation to show that subsequently they both always remain at rest in the TT coordinates, despite the action of the wave. This means that the vontravariant...
  13. G

    Superluminal Frame Adjustments?

    In theory the set of Inertial Reference Frames could consist of an infinite set of rectangular grids and distributed clocks, overlaid and sliding through one another without interference. Let us say we are initially at rest at the Origin of IRF K. Relative to K, the grid of moving frame K’...
  14. K

    Why Is an Accelerated Frame of Reference Non-Inertial?

    Why an accelerated frame of reference is non-inertial?
  15. A

    Energy discrepencies depending on frame of reference

    The other day, I was arguing that a car traveling 70mph rear-ending a car traveling 55mph is the same as a car traveling 15mph rear-ending a stationary car. My argument was that, from the frame of reference of the car that was traveling 55mph, the energy of the other car is k(152), where k =...
  16. T

    What is the acceleration of a plane based on a pendulum's angle?

    Homework Statement Granted, I may be thinking too much into this. You are sitting in a jet airplane as it accelerates at a constant rate down the runway. Being a good physics student you hold the string of a small pendulum of length l = 0.75m and mass m = 1 kg. You then measure the...
  17. jaketodd

    Relativity of simultaneity implies a universe for each reference frame?

    The fact that the relativity of simultaneity causes events to not happen at the same time, dependent on reference frame, seems to imply a separate universe or world for each and every thing in the universe. Different events at different times due to the relativity of simultaneity would lead to...
  18. K

    C according to what reference frame?

    This question may be nonsensical, but I have to ask. I'm a noob to relativity so please bear with me. All observers measure the same speed of light, correct? We also know that there is no favored frame of reference. So... what is to stop an object from accelerating to 0.95c, taking a...
  19. P

    Light speed in a non Inertial frame of reference

    Does the principle of invariant light speed still hold in a non Inertial frame of reference? Thank you!
  20. I

    Particle moving in a rotating frame

    There is an example in my lectures notes I am having trouble following through: A particle moving in a rotating frame of angular velocity omega may be described by the Lagrangian: L= \frac{1}{2} m ( \dot{\vec{r}} + \vec{\omega} \times \vec{r} )^{2} N.B. \vec{r}.\vec{i} = x , \frac{d \vec{r}...
  21. C

    Is spacetime an absolute reference frame?

    STUPID QUESTION ALERT! Is spacetime an absolute reference frame?
  22. F

    Newton 2nd law + frame of reference

    hello forum, i am struggling with the conceptual understanding of this problem: Given two blocks, one on top of the other. There is friction between the two blocks. The upper block is pulled with a force F. Thanks to friction, as long as F is smaller or equal to the static friction...
  23. Artlav

    Bank angle from horizon frame?

    How can i find out aircraft's bank angle knowing it's local frame in horizon frame? Specifically, the horizon frame is y for up, z for north, x for east, the plane frame is x for right wing-wards, z for nose-wards, y for up. I know unit vectors of plane frame in horizon frame, and want to...
  24. W

    Understanding the Difference Between Original and Instantaneous Rest Frame

    Hi there, Could anyone explain to me what is the different between the two terms (i) Original rest frame (ii) Instantaneous rest frame When do we prefer to work in the original rest frame but not the instantaneous one and why? And when do we prefer to work in the instantaneous rest...
  25. e2m2a

    Torque relative to an inertial frame

    I have a thought experiment I cannot resolve. Maybe someone smarter than I can resolve this. Suppose we have a long, thin rod, rotating in the counter-clockwise direction around a pivot axis which is at the end of the rod with an initial angular velocity equal to w. The axis is connected to a...
  26. edpell

    Exploring the Finite & Unbounded Universe: The Preferred Frame

    If the universe is finite and unbounded why can not we think of the frame that sits with it's origin at the center of the 4-D sphere as a preferred frame? The preferred frame?
  27. bcrowell

    Definition of a rotating frame in GR?

    What is a definition in GR that correctly captures the concept that a frame is rotating? Is it enough to say that it's stationary but not static?
  28. W

    Particle collision/decay in CM frame

    Homework Statement Consider the process, in the lab, (K plus)(proton) to (K plus)(Pion neutral)(proton). The final state of K has a momentum of 5GeV/c and the pion has a momentum of 4 GeV/c and the angle between them is 7.3 degrees. The first part asks to calculate the invariant mass of the...
  29. S

    Earth is a inertial frame of reference

    hi all of u WHAT IS INERTIA? and Earth is a inertial frame of reference or non inertial frame of reference? tell me briefly.
  30. S

    How to relate kinematics of a moving frame and that of a laboratory frame?

    Hi all, if I have the velocities and rotations of an object with respect to a moving frame. Are there relations that I can obtain the velocities and rotations of the object with respect to a fixed frame?
  31. M

    Metal frame moved through uniform magnetic field

    A square rigid metal frame PQRS, of side 12 cm, forms a closed circuit with an ammeter. It is moved through an enclosed region of uniform magnetic field of flux density 2.0 × 10–2 T, from left to right. The field is confined to this area and directed into the page. PQRS --> magnetic field -->...
  32. J

    How does the holographic principle relate to the reference frame of a photon?

    So if I'm a fast object moving in a sphere, in my frame of reference the sphere begins to contract along the direction I'm moving. As I approach the speed of light, the sphere begins to deform into a disk. If I'm a photon, the sphere is a disk. Rather than requiring requiring 4 coordinates to...
  33. N

    Frame dragging and absolute rotation

    I'm trying to wrap my head around how rotational frame dragging affects the centrifugal force of a massive, rotating body and was hoping someone could explain this concept to me better. If I am confused on any of the points below please let me know. It is my understanding that there is no...
  34. M

    Neutron collision from com frame

    Homework Statement A neutron with kinetic energy T= 2mc^2 (m=rest mass),strikes another stationary neutron.What will be the combined kinetic energy of both the neutrons in the frame of their centre of inertia and the momentum p of each neutron in that frame.what is the velocity of the...
  35. J

    Frame of references in time dilation

    Let's suppose that I am the Captain at a space dock sitting in interstellar space. My crew decides to go on a trip in our ship, so they board and set off at .9c. t = t0 / sqrt( 1 - v^2/c^2 ), t0 = 1, v = .9c, therefore t = 1 / sqrt( .19 ) = 2.3 (approximately) So as they speed off, 1...
  36. Y

    Telling if a reference frame is moving or at rest

    As stated in SR and the principle of equivalence, there is no privileged reference frame or reference frame at absolute rest. However, I went across the following idea that seems to be able to tell if a reference frame is moving or at rest. Please help me point out what is wrong in my idea...
  37. T

    Relativity- CM and Lab frame energy

    Homework Statement Hi, I've been doing some relativity past paper questions and I totally got stuck on 2 of them. Both regarding an elastic collision of 2 electrons at relativistic speeds. First question: I am to show that it is true that the total energy of the electron which is in motion...
  38. B

    Changing the inertial reference frame to follow a mass in a collision

    Homework Statement We could change to inertial reference frame in a collision to follow a mass. But what would the down side be if we did? Homework Equations Vf1=(M1-M2)/(M1+M2)*Vi1 +2M2/(M1+M2)*Vi2 Vf2=2M1/(M1+M2)*Vi1 +(M1-M2)/(M1+M2)*Vi2 The Attempt at a Solution This question...
  39. K

    Minkowski diagram frame scale comparison

    Homework Statement Draw a clearly labelled “Minkowski spacetime” diagram illustrating two events ((1) a farmer firing his laser gun at his cow, which is sitting along his positive x-direction, and (2) the cow dying) as observed by two observers (S at rest in the farmer’s and cow’s frame, and...
  40. W

    Measuring E & B Fields in Moving Frame

    Homework Statement Suppose E and B are measured by an ovserver at rest to be (in N/C) E = [0,0,60] B = [0,0,0] Now another observer travels close by in the +x direction at a constant speed of v = .8c with respect to the other observer. A. What is E' be in the moving frame? DONE b...
  41. N

    How to Calculate Force Between Moving Charged Particles?

    Homework Statement In a frame S, two identical particles with electric charge q move abreast along lines parallel to the x-axis, a distance r apart and with velocity v. Determine the force in S that each exerts on the other, by use of the force law for a uniformly moving charge. I would...
  42. K

    Optimal Angle for Frame Design Project

    I am building a frame that is supposed to resist the highest possible force in the horizontal direction. I am stuck at determining what is the optimal angle at which to design a member that runs against the applied load. In my project the load applied is in the - x direction and the member i am...
  43. V

    Electric resonance in a moving frame

    The resonating frequency of a series LC circuit is given by: f=(c/2πn)[(dD/Aa)^1/2] This frequency measured in a moving frame is same and hence c is concluded to be constant but the distances and areas may change due to length contaction and the values of inductance and capacitance should not...
  44. Demystifier

    Does instantaneous communication implies a preferrred Lorentz frame?

    Nonlocal entanglement of quantum mechanics suggests the existence of instantaneous communication between distant particles. Related to this, one often hears the following argument: Argument 1: "If the communication is instantaneous in one Lorentz frame, then it is not instantaneous in any...
  45. V

    Simple Deflection of a Cantilever Frame. .

    Homework Statement For the given frame, find the horizontal deflection at the tip of the frame (deflection)C. The frame has a uniform stiffness EI. http://img27.imageshack.us/img27/5493/83214722.png The Attempt at a Solution I don't actually have anything to show, all I want is a hint in the...
  46. G

    Confusion about a laser shining perpendicular to a moving inertial frame

    I found this nice book on Google http://tinyurl.com/yh2y2zb that does a great job explaining relativity, however, even though the conclusions make perfect sense to me so far, I'm stuck on a conceptual issue when reading over the classic thought experiments that makes me feel like I'm still...
  47. I

    Communicating Vessels in a noninertial reference frame

    Hello all, Should be a simple question (just started Physics 1 not long ago). Here it is: The thin, fluid filled glass tube is sitting on an accelerating cart. As a result the level of the fluid rises as shown in the picture (attached) by D = 0.6 m. The distance L is given. L = 0.2 m...
  48. J

    Sway Frame, Stuck with finding sway factor (Moment Distrubution)

    Homework Statement I have a sway case beam as in the image below, but do not know the equation for the pinned joints. We were told Moment (AB) = 6EI(delta)/Lsquared for fixed ends such as AB and BA but not told the moment equation for CF for example. I am assuming FC = 0 due to no moment at...
  49. T

    Superconducting Frame in Magnetic Field (Moscow Phys-Tech)

    Hello everybody, I've been trying to understand fully the problem I found in a famous Physics book (A guide to physics Problems Part 1). The maths behind the problem are understandable. However, even if I found the partial solution to the problem at the end of the book, several points are not...
  50. fluidistic

    Confused about charged rotating disk-Magnetism, reference frame

    For some reason I've thought about the following case : A uniformly non conductor charged disk is rotating with an angular velocity \vec \omega. If I see it in front of me I'd observe a magnetic field since moving charges produce a current which produce a magnetic field according to Ampere's...
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