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. D

    The co-moving frame - acceleration, momentum and velocity

    Hi all, I'm having trouble with the concept of a co-moving frame, specifically in the context of constant proper-acceleration (hyperbolic motion). I feel like I don't "get it"; and perhaps this is related to some deeper misunderstandings I may have regarding the definitions of certain quantities...
  2. L

    A plane shoots a bullet -- energy at different frame?

    Let say a plane flights at 1km/s, shoots a 2kg projectile at 1km/s, so to the Earth, the projectile flights at 2km/s with 2*2*2/2 = 4MJ. The same gun when fixed on Earth, shoots the same 2kg projectile at 1km/s, achieves 2*1*1/2 = 1MJ Assume that the energy comes from burning propellant or...
  3. J

    How to determine speed with no frame of reference?

    You are standing on one. The two planets were closing in on a speed of 1x. You just accelerated one of the 2 planets towards the other with a super powerful rocket engine, and then sat on one of them. Now they are closing in on each other at speed 10x. The universe is otherwhise empty. The...
  4. T

    How does acceleration affect the period of a pendulum in an elevator?

    Homework Statement The question is: A simple pendulum is mounted in an elevator. What happens to the period of the pendulum (does it increase, decrease, or remain the same) if the elevator (a) accelerates upward at 5 m/s/s (b) moves upward at a steady 5 m/s (c) accelerates downward at 5 m/s/s...
  5. Fizz1cks

    Frame rate of a video: Calculating velocity of liquid

    Homework Statement The problem I have is not actually so much a physics problem but more of a logical problem. When we look at rulers and any kind of measuring tools, we start from zero. We count the number of intervals instead of the divisions. Suppose we have a video with 7 frames per...
  6. U

    Rigidly Constantly Accelerating Frame

    We know that when a rigid frame, say a rocket undergoes constant proper acceleration, its worldline is hyperbolic. The equation is given by: x^2 - c^2t^2 = \left( \frac{c^2}{a_0} \right)^2 Suppose P is such a worldline and worldine can also be written as: I understand how these are...
  7. S

    Oscillating springs in relativistic time frame

    1. The problem statement, equations, and work done: [A] Two identical spring and mass oscillators are set in motion in perpendicular directions. The masses are each 4.0 kg and the spring constants are 196 N/m. [1] Calculate the angular frequency and the period of the oscillators. ##\omega =...
  8. M

    Energy of neutral pion in proton's rest mass frame

    Hello, my problem is as follows I've tried finding the invariant mass of the positron and pion as follows M^2=(E_e+E_{\pi})^2-(\mathbf{p_e}+\mathbf{p_{\pi}})\\ =E_e^2+E_{\pi}^2+2E_eE_{\pi}-p_e^2-p_{\pi}^2-2\mathbf{p_ep_{\pi}}\\ =m_e^2+m_{\pi}^2-2(E_eE_{\pi}+\mathbf{p_ep_{\pi}})\\...
  9. U

    Compton Scattering Angle - CM FRAME

    Homework Statement Given incoming photon has energy 10Mev and scatters at angle 25 degrees, find the scattering angle in CM frame. Homework EquationsThe Attempt at a Solution [/B] In lab frame, let the energy of incoming photon be ##E##. Total 4-vector would be ##P + Q =...
  10. AdityaDev

    Frame of reference and Pseudo forces

    If you have a car and a pendulum is hanged inside it, and if you watch from outside the car,and if the car has some acceleration, then you see the bob moving in opposite direction of motion of car. For a person standing outside, he knows that the car has some acceleration. What causes the bob...
  11. PeroK

    Finding a Local Inertial Frame

    Homework Statement I am trying to find a local inertial frame for the following metric: ds^2 = -(1+\Phi(x))dt^2 + (1-\Phi(x))dx^2 I can get the transformed metric to equate to η at any point, but I can't get the first derivates wrt the transformed coordinates to vanish. Homework Equations...
  12. M

    Structural Frame Analysis: Determining Shear and Bending Diagrams

    Homework Statement Hello. I've created a small program to find shear and bending diagrams of the members of a frame. I was able to get the reactions at the support but don't know how to continue from now. This is an example of a frame all columns are 3m in height and the beams 8m. All the beams...
  13. PWiz

    Is a Zero Frame of Reference Possible in the Universe?

    Alright so I'm still trying to get a hang of the theories of relativity, and this thing has really been bugging me. All forms of motion (and sometimes even physical observations) are defined for a particular local frame of reference. But is there any "stationary" frame of reference in the...
  14. 9

    Coordinate transform from sensor to North East Down frame

    I am using an algorithm that transforms from my sensor frame to North West Up and I want to instead use North East Down. I have attached the current algorithm. I also want to skip the first step in my algorithm. Here is the current algorithm: http://www.filedropper.com/transformationalgorithm...
  15. M

    Structural analysis of a concrete frame

    Hello. I have a project for next semester and I'm thinking of creating a program using mathematica to analyze a concrete frame to obtain the moment and shear diagram. What would you consider the best method for analysis. The loads will be uniformly distributed. Any tip will be greatly...
  16. K

    Inertial frame of reference question for stacked boxes

    Hello, I was wondering about a question and how it would be reconciled within Newton's laws of motion. Take a case where two boxes are stacked on top of each other, and the bottom box rests on a frictionless surface. Now, imagine a rope is attached to the top box, and tension is applied to...
  17. resurgance2001

    Cosmic rest frame, comoving distance, and proper distance

    Hi I am trying to understand more about these terms. I am currently studying a course about relativity and cosmology, but I am finding the textbook (Open University) difficult to follow. Can anyone help me untangle and make some simple sense of these different terms? Thanks (I accidentally...
  18. resurgance2001

    Cosmic rest frame, proper distances and comoving distances

    Hi I am trying to understand more about these terms. I am currently studying a course about relativity and cosmology, but I am finding the textbook (Open University) difficult to follow. Can anyone help me untangle and make some simple sense of these different terms? Thanks
  19. ShayanJ

    Spin-Orbit interaction in nucleus' rest frame

    In all the places where Spin-Orbit interaction is discussed, the equations are derived by going to electron's rest frame and considering the interaction of nucleus' magnetic field with electrons spin magnetic moment. But from SR, we know that there as to be an explantion from the nucleus's rest...
  20. R

    Lightweight Tubular Frame: Can it Float?

    Can you use a vacuum, or lighter than air gas within a tubular frame network to neutralize the apparent weight of the frame? If this is possible what is thee smallest possible size you could make this frame, I understand that the more you scale it up the lighter proportionately the frame would...
  21. A

    What is the suitable unitary operator for a rotating frame?

    Hello, I have a Hamiltonian that describes a particle in a rotating cylindrical container at angular frequency ω. In the lab frame the Hamiltonian is time-dependent and takes the form (using cylindrical coordinates) \mathcal H_o=\frac{\vec P^2}{2m}+V(r,\theta-\omega t,z), where V(r,\theta,z)...
  22. mrnike992

    Speed of Light: What Frame of Reference?

    My apologies for the numerous times this has probably been posted, but I wasn't able to find a great answer through the search tool alone. Please correct me on anything I state incorrectly, and direct me to the answer.. My question is, if the speed of light is 299,792,458 m/s, its speed is...
  23. moriheru

    Quantum scattering theory (lab frame, center of mass frame)

    Greetings, Here is my question: What is the difference between the labframe and the center of mass frame in QM scattering theory? Is it that in the labframe both particles are moving towards each other and in the center of mass frame one particle is static and a second one is moving towards the...
  24. S

    Doubt about Frame Dragging and planetary revolution

    Our sun rotates in counter clockwise direction and hence frame dragging will be also in that direction. Suppose if we put a satellite in sun's orbit (almost circular) to revolve in opposite direction to the sun's spin, what would happen to the orbit of the satellite? Would it fall into the sun?
  25. M

    Light angles measured in a moving reference frame

    I've managed to get through all of this question without trouble until part d). The full question is given here: I've calculated the "true" angles of Star A and Star B as 71.57 degrees and 45 degrees respectively in Frame S, and the "light" angles should be the same, since the stars are...
  26. C

    Kinetic energy of a rotating and translating body?

    Homework Statement Not a homework or coursework question, but given the simplicity of the problem I feel that this is an appropriate subforum. Consider a person spinning a rock on a string above their head at a constant angular velocity, walking away from the observer at a constant linear...
  27. MattRob

    Vacuum Fluctuations and a Preferred Frame

    So, from what I understand, quantum uncertainty means these vacuum fluctuations occur, and out of them come virtual particle and antiparticle pairs. How does this not create a preferred frame of reference? A particular particle pair must have a certain amount of energy, and in one frame where...
  28. V

    Time Dilation in accelerated frame

    Homework Statement Hi, I have an exercise where we are supposed to find a condition for which two clocks are synchronise if one clock is accelerated. Homework Equations The time dilation in an inertial frame moving with velocity v is well known. t'=\frac{t}{1-\frac{v^2}{c^2}} The Attempt at a...
  29. J

    FEM stiffness matrix for simple frame exploiting symmetry

    Hello. I need help with the following problem: I don't know where to start. I know that the frame can be split up into one symmetric part and one symmetric+assymetric part but i forgot the theory and rules on translation and axis etc. I hope someone can help as I have to hand in the...
  30. putongren

    Introduction to Tensor Calculus, Relativity Homework

    I already have the solutions emailed to me from a D H Lawden textbook. I have trouble understanding the solution as the solution is not formatted properly, and the answer seems to be a little too advanced for me. I hope that some one can help me understand the problem. 1. Homework Statement...
  31. M

    Three Reference Frame Relativity Problem - Velocity Addition or Proper Lengths

    Homework Statement Anna and Bob have identical meter sticks. Anna an observer on Earth, sees Bob traveling in a spaceship at 0.5c away from her. Bob leaves his spaceship in an escape pod, moving away from Earth and the spaceship at 0.1c with respect to the spaceship. How long is Bob's meter...
  32. David Carroll

    Does acceleration change according to inertial frame of reference?

    I apologize if this has been discussed before. I am no physicist, I am just trying to see if I am understanding special relativity correctly. Please be advised I am dumb, so be gentle. If a spaceship (sorry for the cliché, but it's a little bit cumbersome to keep using the phrase "inertial...
  33. D

    Find the frame length with derivative

    Find the optimum frame length nf that maximizes transmission efficiency for a channel with random bit erros by taking the derivative and setting it to zero for the following protocols: (a) Stop-and-Wait ARQ (b) Go-Back-N ARQ (c) Selective Repeat ARQ My work has been uploaded I am a bit rusty on...
  34. aditya ver.2.0

    Query regarding to the frame of reference

    If a metallic ball is place inside a giant hollow top, and the top starts to rotate. Along with the top, the metallic ball will also start to rotate. Thus my question is the ball motion is under inertial frame of reference or non-inertial ?
  35. D

    Thermodynamics and intertial frame

    Is thermodynamics states like temperature, pressure and material properties like specific heat, thermal conductivity etc. invariant with inertial reference frame?.
  36. aditya ver.2.0

    Query regarding to the state of frame of reference for the ball

    If a metallic ball is place under a giant hollow top, and the top starts to rotate. Along with the top, the metallic ball will also start to rotate. Thus my question is the ball motion is under inertial frame of reference or non-inertial ?
  37. PhysicsKid0123

    Need help understanding relative motion and frame of references

    Okay guys, I still feel like I don't quite understand these concepts well enough. Do you guys have any websites or links to help me understand these concepts better? I feel like I only partially understand these concepts. I also feel like I partially understand the application of the mathematics...
  38. Ascendant78

    Would a uniform circular motion frame be inertial if ω is constant?

    I'm wondering if someone is observing a situation from a frame moving in a uniform circular motion, would that frame of reference be considered inertial? I'm unsure because of the centripetal acceleration towards the center.
  39. Diploria

    Hafele-Keating with the plane as reference frame?

    Hello, I noticed quite a few questions on the Hafele-Keating experiment here, but I believe none that have my exact question. I understand the explanation given for "a frame of reference at rest with respect to the center of the earth", as in the Wikipedia article. But what happens if...
  40. W

    What is a metric for uniformly moving frame?

    The Schwarzschild Metric has a form: ##ds^2 = Kdt^2 - 1/K dr^2 - r^2dO^2## where: K = 1 - a/r; There is a time scaled by K, but a space radially by 1/K. This is a typical time dilation and a space contraction, which is known from SR, but the Schwarzschild metrics is spherically...
  41. andrewkirk

    Einstein tensor in the FLRW frame

    Einstein tensor in the FLRW frame - Part 1 of 2 This note develops a formula for the ##G^{00}## component of the Einstein tensor in the FLRW coordinate system for a homogeneous and isotropic spacetime. We use the convention that tensor indices ##i, j## or ##k## are used only for spatial...
  42. wolram

    Granular space time and frame dragging

    If there were only one rotating massive body and a detector in the universe, would the detector be able to detect that body due to frame dragging, i am imagining the body acting on granular space time akin to a whirlpool, were space time is disturbed in a spiral motion. I am not talking about...
  43. M

    Non-Inertial Frame: Key Clues & Examples

    I confuse when should I use non-inertial frame... is there any keyword or key clues that remind you of using non-inertial frame of reference? can anyone help explain this with an example?
  44. Satvik Pandey

    Relative velocity in inertial frame

    The swimmer will move in the direction of resultant of his velocity and velocity of water. Draw the diagram and the try to solve it.
  45. M

    The Earth: An Inertial Frame of Reference

    How Earth is considered to inertial frame of reference?
  46. Greg Bernhardt

    How Do Rotating Reference Frames Affect Physics Calculations?

    Definition/Summary Often in physics we need to consider frames of reference that are non-inertial (the Earth spinning on its axis for example). We must therefore see how these rotating reference frames relate to an inertial reference frame. Equations \frac{d^2\mathbf{r}}{dt^2} =...
  47. Greg Bernhardt

    Frame Dragging: Definition & Equations

    Definition/Summary Einstein's theory of general relativity predicts rotating objects drag spacetime around themselves in a phenomenon referred to as frame-dragging or the Lense-Thirring effect. This effect is also sometimes referred to as Gravitomagnetism- Extract from wikipedia- 'This...
  48. C

    Derivation eqn motion particle rotating frame

    Homework Statement So this isn't a homework problem but I don't know where else I am supposed to post for general help. I am basically trying to understand the derivation for the equation of motion of a particle in a rotating frame. See attachment for derivation and which steps I am stuck on...
  49. D

    Does the Existence of the Axis of Evil Mean a Special Frame of Reference?

    Does the existence of the "Axis of Evil" observed by WMAP and Planck mean that there is a special frame of reference in the universe?
  50. X

    Relativistic speeds within a relativistic frame of reference

    Astronauts on a long space journey are playing golf inside their spaceship, which is traveling away from the Earth with speed 0.6c. One of the astronauts hits a drive exactly along the length of the spaceship (in its direction of travel) at speed 0.1c in the frame of the spaceship. What is the...
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