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. M

    What's an inertial frame of reference?

    The Earth is an approximately inertial reference frame since it's acceleration with respect to the stars is very small. But if a group of stars is accelerating with respect to another group of stars which group is the inertial frame? Or thinking on an even larger scale, if a universe is...
  2. M

    Denavit-Hartenberg Frame Assignments

    Homework Statement I'm required to assign co-ordinate frames to an RPR robotic structure, using the Denavit-Hartenberg notation. Homework Equations N/A The Attempt at a Solution I've made the following two attempts at the problem, but i aren't sure which, if any, is correct...
  3. M

    The part of relativity I never got, reference frame

    So I was pondering long distance space travel. As I understand it, if you can accelerate a vessel, say over the course of a year, to near light speeds, you can cover very very long distances in a very short period of time(as measured on your on space ship) due to the effects of relativity...
  4. D

    How Do You Calculate Electric Field for a Non-Parallel Finite Line of Charge?

    Homework Statement Last week I https://www.physicsforums.com/showthread.php?t=483819" which I believe didn't get answered because my description of the problem was a lot messier than it needs to be. Hopefully today, I will not make the same mistake. In physics books, when calculating the...
  5. J

    Putty dropped on a frame suspended from a spring.

    Homework Statement A 0.150 kg frame, when suspended from a coil spring, stretches the spring 0.050 m. A 0.200 kg lump of putty is dropped from rest onto the frame from a height of 30.0 cm The collision between the two is perfectly inelastic. Find the maximum distance the frame moves downward...
  6. N

    Rest Mass and Preferred Frame of Reference

    Einstein's theory of relativity is based on the fact that all motion is relative, which precludes the existence of a universally defined state of rest (priviledged reference frame). Einstein also recognises the existence of rest mass. If an object were at its rest mass, wouldn't it be perfectly...
  7. M

    Will a Carbon Fiber Car Frame Affect the Handling of My Electric Mini Cooper?

    hi, I've been toying with the idea of converting my mini cooper to an electric car, and I'm brainstorming ways to reduce the weight as much as possible. I came up with the idea of a carbon fiber frame to replace the heavy steel one, I found a company that can do it for me, but I was wondering...
  8. S

    Inertial and non-inertial frame of reference

    Okay, so I know what inertial and non-inertial frames of reference are: 1. Inertial is when Newton's laws of motion hold. 2. Noninertial is when they do not hold (the object is accelerating without a force). And I have a few examples as well, such as when you are is in a car and the car is...
  9. E

    Frame velocity v. object velocity in derivation of 4-velocity

    I've been learning about 4-velocity and all the "proper" 4-vectors recently, and if I understand correctly, proper velocity η (the 3-vector) is related to ordinary velocity by the relation \vec\eta = \frac{\vec u}{\sqrt{1-\frac{u^2}{c^2}}}, where u is ordinary velocity of an object within a...
  10. S

    Frame of reference, energy and momentum of particle

    Homework Statement In a certain reference frame, a particle with momentum of 4 MeV/c and a total energy of 5 MeV (a) Determine the mass of the particle. (b) What is the total energy of the particle in a reference frame in which its momentum is 4 MeV/c? (c) What is the relative speed of the two...
  11. Y

    Let a clock A be at rest in an inertial frame and let a clock B rotate

    Let a clock A be at rest in an inertial frame and let a clock B rotate around it with constant velocity and constant distance from A. Let v be the velocity of B relative to the inertial frame. Both clocks count how long it takes for B to rotate once. According to clock A, the time it takes is...
  12. D

    Frame dragging from a light beam

    Does light beam create linear frame fragging around it? If answer is positive, can light become 'tired' going thru the universe and exchanging the momentum with the environment via frame dragging?
  13. A

    Vibration Analysis of an Offset Frame

    1.0 Introduction As the thread title suggests, this is indeed referring to a lab experiment. I am not posting here to gain easy solutions to the lab manual questions, rather I'm posting here to gain knowledge on a subject I know very little about. Let me explain the lab experiment in detail so...
  14. T

    Work done in an accelerating frame.

    Homework Statement A man of weight W is in an elevator. The elevator accelerates vertically up at a rate a and at a certain instant has a speed V. The man then climbs a vertical ladder within the elevator at a speed v relative to the elevator. What is the man's rate of expenditure of energy...
  15. M

    From what frame of reference does the Earth orbit the sun?

    I have been doing some study on the theory of relativity and it has got me thinking. We say that the Earth revolves around the Sun but from what reference frame? From the reference frame of Earch, we are stationery and the Sun simply spins. Why is any reference frame more accurate than another...
  16. pellman

    Coordinate basis vs local frame?

    The wikipedia article on connection forms refers to a local frame. What is the relationship between local frames and coordinate bases? Are they the same thing? Is one a subset of the other? The connection form article uses general notation e_\alpha for the basis elements instead of the...
  17. D H

    Rest Frame of a Photon - FAQ by Forum Members

    I've read that in relativity the concept of the rest frame of a photon doesn't make sense. Why is that? A rest frame of some object is a reference frame in which the object's velocity is zero. One of the key axioms of special relativity is that light moves at c in all reference frames. The rest...
  18. E

    Does a photon have a frame of reference?

    My thinking has been that a photon, in its own F of R, in a vacuum, travels through space, but not through time. This seems to have been "confirmed" in various things I have read. However, I recently came across the assertion that "...in physics, there is no theory that defines the frame...
  19. Z

    Gravity - an accelerating frame paradox

    If the equivalence principle is true then it means that the Earth's gravity field is a constantly accelerating frame of reference. In any accelerating frame of reference the direction of acceleration is always opposite to the direction of attraction. That means that for all observers on the...
  20. R

    Circular Motion - Triangular Frame

    Homework Statement The Attempt at a Solution I'm going to post all that I figured out or tried. Most of it is really just pieces of information that I don't know how to put together. The frame is accelerating, so I have to apply a pseudo-force of \frac{3mg}{2} on B and C in the...
  21. J

    General Relativity: Frame Dragging in Spherical Shell

    Homework Statement An isolated, thin, rigid, spherical shell has mass M and radius R. If the shell is set slowly spinning with angular momentum J, show that inertial frames within the shell rotate at angular velocity w with respect to an observer at rest at infinity, where: w=2GJ/(c^2*R^3)...
  22. D

    Solving the Mystery of Graviton & Einstein's Accelerating Frame Model

    Hi. I'm a sophomore level undergrad trying to understand General Relativity (and all of physics for that matter) with the currently insufficient tools I possess. I was reading Einstein's book, "Relativity", and when I came to the section that describes gravity as the apparent force that arises...
  23. R

    Ellastic collision between a frame and projectile

    Homework Statement To rods, each with mass 0.3 kg and length 0.2 m, are welded together at one of their ends, so they form an L-shaped frame. A ball with mass 0.3 kg and with speed 5 m/s hits one of the rods at its end at an angle of 0 degrees (so ball speed vector is perpendicular to one...
  24. T

    .Calculating Reaction Forces and Moments for 3 Pin Frame ABCDE

    A 3 pin frame ABCDE is supported at A and E. it supports vertical loads of 60 kN at B 80 kN at c and 100 kN at D as well as a horizontal UDL of 50kNm along DE. Calculate the reaction forces. I have REV = 124 kN and RAV = 116 kN. REH = 115.3kN and RAH = 215.3 kN. Are these correct Next...
  25. K

    Preserving Magnetic Polarity in a Revolving Reference Frame

    ***not homework for any class*** Title: "Preserving Magnetic Polarity in a Revolving Reference Frame" Problem: How can a revolving reference frame (assuming an uncharged observer with negligible mass) observe the same polarity for a magnet in the case where the rotational speed is great enough...
  26. C

    Understanding accelerated frame in general relativity

    Hello, apologies if this has been asked before but I couldn't find it upon searching... My block to understanding general relativity has always been how the idea of gravity being the same as an accelerating frame leads to a a curved space-time? What about the fact of not knowing whether...
  27. N

    The lorentz boost of the CM frame w/ respect to the lab frame

    Hi i have a problem with some work. a muon type neutrino interacts with a stationary electron, producing a muon and electron type neutrino. I have calculated the CM energy but now need to calculate gamma, the lorentz boost. γ=(Eν/2me)^1/2 How do i show this? the info i have is that...
  28. N

    What is the best frame of reference?

    So I was studying some physics, and I keep encountering how many things depend on the frame of reference. For example, kinetic energy and momentum. My question is if there is an absolute frame of reference? Can we define one? I remember reading somewhere that the absolute reference...
  29. N

    Does light really travel in same frame of reference

    Hi, I have a simple question in my mind, I could not find the answer anywhere so I came here. Here is my question, Assume a source of light and observer are five light seconds apart, and are travling parllel to each other at a constant speed of say 200 meters per second. Now if the source of...
  30. N

    Are there any energy change of photon in different frame?

    Please teach me about this: Are there any change in energy and momentum of photon in different frame?Are there any analogies with Doppler effect? Thank you very much in advance.
  31. V

    Calculating Forces in Gate Frame Members: Am I on the Right Track?

    Hi all, Trying to design a simple gate for the side of our house and in order to select the size of the square tube for the frame, I need to calculate the forces in the members of the frame. I have tried the method of sections and joints, however both do not seem to work. My next...
  32. V

    Will the frame be inertial if no forces act on it?

    Hello :) An object is placed far away from all the bodies that can exert force on it. A frame of reference is constructed by taking the origin and axes fixed in this object. Will the frame be necessarily inertial? Hmm According to me, it should be an Inertial frame as No force acting on it...
  33. T

    Limits of Frame Dragging: Can Objects Create Their Own Event Horizons?

    Objects smaller than black holes, by mass can still drag space along with their rotation. I picture this like a plate of Spaghetti there the pasta is radiating out from the center of the plate. But let's say its rubbery spaghetti and can stratch. And its attached at one end to the outer egde of...
  34. B

    Should I Add Diagonal Bracing to My Structural Steel Frame Design?

    Hi there, I've got an assignment due today and as usual have left finishing it off until the last minute. I've completed most of it but I thought I'd try and get an opinion on something. Homework Statement Basically our teacher has asked us for a very simple steel frame (beam, column...
  35. M

    Is a point (x distance from earth) inertial frame ?

    me and my friend were arguing (like always) about inertial frame ? to sum up i m just asking a straightforward question ? let say (for simplicity) there is just Earth and an other object in whole universe. a point whose distance from Earth is x. and dx/dt = 0. now is that point (which...
  36. I

    Frame dragging around a rotating black hole.

    Hi: I’m a new member to this forum. I’m looking at the behavior of frame dragging around a rotating black hole. It seems to me that frame dragging should be zero about a rotating black hole’s axis of rotation, but should be at a maximum at the equator (i.e. 90 degrees from its axis of...
  37. R

    A sliding puck analyzed from an inertial reference frame

    Homework Statement Located here:http://imgur.com/qP9fd.png" The Attempt at a Solution I don't know how to do this problem. First of all how do I approach it? Should I do a free-body diagram? Should it be done at position 1? How do I account for the different frame of reference...
  38. K

    Pendulum tension in rotating reference frame

    Homework Statement A student is in a rotating chair with a pendulum hanging down in the middle of the rotation. . I need to calculate the difference in tension when the bob is hanging vertically and when the chair is rotating. The length of the bob and string is 65.3 cm. The radius of the...
  39. H

    Electrostatics and reference frame

    Hi, I'm stuck with a question concerning electric fields : Can an electrostatic potential drop exist in (what I would call) a 0 dimensional system ? Let's imagine we are in a region of space where there is nothing but a uniform magnetic field. So the problem is anisotropic but does not...
  40. J

    Major difference of Inertial and non-inertial frame of reference ?

    Major difference of Inertial and non-inertial frame of reference ?? What is the major difference or differences of Inertial and non-Inertial frame of reference?? Is it only: Inertial - Constant velocity, obeys the law of inertia Non-inertial - Acceleration, disobeys the law of inertia
  41. B

    Reinforced Concrete Portal Frame

    Hi all, I massively appreciate any help in advance. I have an exam coming up and am completely stumped on a question regarding reinforced concrete design. The teacher has told us the question is going to be similar to the example he has given us but hasn't gone through it with us. It is a...
  42. 1

    Why do we treat earth and why does it work as an inertial frame

    Earth is clearly not an inertial frame, its in orbit and not following a single direction of movement. Why then do we treat it as one? Are there any slight differences in the laws of motion in a true inertial frame in contrast with those on earth?
  43. M

    Bead on loop of wire in rotating frame

    Homework Statement Consider a bead sliding without friction on a circular hoop of wire rotating at constant \Omega, where \phi is the angle between the bottom of the hoop and the bead. Find the equation of motion of the bead. \hat{\Omega}=\hat{z} Homework Equations...
  44. P

    Is Radiation a Frame-Variant Process?

    Hi, Is radiation a frame variant process, which means for example, if someone is co-accelerating with an accelerating charge(such that no relative motion) then he will not witness radiation since to him, since the charge is stationary. However, to an inertial observer outside, he will...
  45. H

    Time Dilation: What's the Rest Frame?

    I really don't quite understand the result of time dilation. Let's say that we have two identical twins A and B. Twin A is at rest and twin B is on a high speed rocket ship. Let's say that 10 years has passed in frame A. According to relativity, the twin in frame B is supposed to measure less...
  46. B

    Problem in inertial reference frame

    Well, in principle, this problem seems very easy but I don't know the exact explanation.Here we go. We have a truck and a pack in its back.The bed of the truck is frictionless and the pack is stopped by a small piece of wood of something like that. The size of the pack is whatever(for...
  47. A

    Solving Rotating Frame Problem: Need Help!

    i am facing problem in attempting the peoblem attached below if i work in the non inertial frame (the rotating) shouldn't the acceleration of m_a after the catch is removed be simply =\omega2ra thanks in advance
  48. T

    Center of Mass Frame question

    Homework Statement A key concept about the center-of-mass frame is that A. the total momentum in the center of mass frame is always zero. B. both the initial and final momentum vectors form pairs of equal magnitude and opposite direction C. this frame always moves at the same velocity...
  49. B

    How to show time ordering is frame independent

    Hello, everyone I am studying Srednicki's "Quantum Field Theory", section 4 "The spin-statistics Theorem". Does anyone know how to show that "The time ordering of two spacetime points x and x' is frame independent if their separation is timelike."(P32), explicitly? And "Two spacetime points...
  50. P

    Block sliding down accelerated inclined (need inertial frame approach)

    Homework Statement A block of mass "m" is placed on an incline of angle \theta and mass "M", which is placed on a horizontal surface (the ground) and release from rest. Both the block and incline start accelerate. All surfaces are frictionless. Find the acceleration of the block with respect...
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