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. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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?
  6. 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...
  7. 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...
  8. L

    How Far is the Pendulum from the Axis on a Rotating Platform?

    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...
  9. E

    Concept of coordinate reference frame in GR

    In SR there is a whole family of so called inertial observers that are defined as those observers that move at relative constant speed with respect to one another, whose descriptions of nature are all equivalent and whose spacetime coordinate are related by Lorentz transformations i.e. those...
  10. B

    Designing Motorbike Frame: Researching Forces & CAD Design

    Hi, Firstly i just want to apologise if this is in the incorrect part of the forum. I'm designing and building a motorbike frame for my 3rd year project in Mechanical Engineering. I've started my research into finding the optimal geometry for the purpose of the frame, however I'm...
  11. Rococo

    Time difference between 2 events in moving frame

    Homework Statement Two events occur at the same time in inertial frame S and are separated by a distance of 1km along the x-axis. What is the time difference between these two events as measured in frame S' moving with constant velocity along x and in which their spatial separation is measured...
  12. Z

    1D Elastic Collision - Velocities in the CM/ZM Frame

    Homework Statement Prove that, for any 1D elastic collision between two particles: as viewed from the centre of mass (or zero momentum) frame of reference, the velocity of each particle after the collision has the same magnitude but opposite sign to its velocity before the collision. 2. The...
  13. Ravi Mohan

    Doppler effect in accelerating frame.

    Consider a spaceship and a source, with no relative motion but spatially separated. At t=0, spaceship moves with velocity v \hat{a}_x w.r.t source and at t = 0 source emits a photon. After photon has been emitted, the speed of spaceship starts increasing in same direction. So what parameters...
  14. S

    Measuring an angle in non-inertial frame reference

    In class, we came up with an equation, a=gtanθ, to calculate the acceleration of a car using a hanging pendulum in Earth's frame of reference (θ being the angle that the pendulum makes with the vertical when the car accelerates). So far, I know that that the pendulum moves in the opposite...
  15. E

    Measuring magnetic fields Will motors and metal frame interfere?

    Hello all, thanks for reading. I'm in the process of designing a machine that will move a hall effect sensor in 3 dimensions through a magnetic field and record readings. Before I started the design however, I wanted to see if there would be huge problems in how I envision this machine...
  16. V

    Equilibrium of frame with two masses

    Homework Statement I need to find the tension T, γ and β in part 2 of this question. The question is attached. Homework Equations First of all, the frame is a right angle triangle because (3L)^2 + (4L)^2 = (5L)^2 take torque about the point O we got 2LF + mg(4Lcosγ) = Mg(3Lsinγ) from...
  17. G

    Shear and Moment diagram for frame question

    Draw the shear and moment diagrams for each of the three members of the frame. Assume the frame is pin connected at A, C, and D and there is a fixed joint at B. Please i need help with this .. would be great if anyone can help
  18. K

    Understanding Frame Dragging: Explanation and Effects

    What is frame dragging?
  19. C

    Special relativity using inertial frame moving at 1/2u

    Quick disclosure, I'm only a few weeks into modern physics, and still trying to get a firm grip on the mechanics involved here. My understanding is that it is possible to use a reference frame that is moving, and this leads to a bit of a paradox, at least under certain conditions. Take two...
  20. M

    Doubt in Inertial frame of reference

    Newton's laws of motions are not applicable in Non-inertial frames of reference which means only mutually accelerated frames of references, My question is how can we apply Newton's laws of motions for practical experiments such as simple pendulum, motion of a ball, etc. conducted in near surface...
  21. M

    Reference frame in relative motion

    I red a classical mechanics concept in a book. Imagine that we have two observers with two frames of reference F1 and F2 observing a particle P in motion. One of the observer is in motion and another is at rest,(lets take F1 is at rest and F2 is in translation motion with velocity V) let r1 be...
  22. WannabeNewton

    Proper Reference Frame -Accelerated observer

    "Proper Reference Frame"-Accelerated observer Hi guys. This is regarding section 13.6 (p.327) in MTW. Here the authors consider an arbitrary accelerated observer in any space-time and construct a set of local coordinates carried along the entire worldline of the oberver with the origin of the...
  23. K

    How to calculate the Consistent Mass Matrix for a 6DOF's Frame

    Homework Statement Hello everyone, as you can see from the picture below this is a 2 storey frame with 6DOF's (2 translational DOF's = u1 and u2, 4 rotational DOF's = u3, u4, u5 and u6). i would like to determine the consistent mass matrix (6x6 and symmetric) of the frame without carrying...
  24. D

    DQ Reference Frame in VSC Station: Fig. 1(b)

    Each VSC station has the same configuration, and its vectorbased equivalent circuit in the synchronous dq reference frame is shown in Fig. 1(b). Could someone please explain me what doe "dq reference frame" mean?
  25. Y

    What is the Correct Value of Dx in Frame Analysis?

    Homework Statement Homework Equations ƩFx=0 ƩFy=0 ƩM=0 The Attempt at a Solution For the entire frame: ƩMA = 0: -360*15 -240*33 + E*12 = 0 E = 1110 lb → ƩFx = 0: 1110 - Ax = 0 Ax = 1110 lb ← These are the correct values so far. Member BC: By = (4/3)*Bx ƩMC=0...
  26. R

    Finding Equilibrium Forces in a Two-Member Frame

    Homework Statement The two-member frame (see picture attached) supports the 200-lb cylinder and 500 lb–ft couple moment. Determine the force of the roller at B on member AC and the horizontal and vertical components of force which the pin at C exerts on member CB and the pin at A exerts...
  27. I

    Independency of the frame of reference of the strain rate tensor

    I've got a problem regarding tensors. Premise: we are considering a fluid particle with a velocity \mathbf{u} and a position vector \mathbf{x}; S_{ij} is the strain rate tensor, defined in this way: \displaystyle{S_{ij}=\frac{1}{2}\left(\frac{\partial u_i}{\partial x_j} +\frac{\partial...
  28. Y

    Statics problem, analysis of a frame

    Homework Statement Homework Equations ƩF_y=0 ƩF_x=0 ƩM=0 The Attempt at a Solution The weight of the wire is 500*16=8000lb I isolated each part of the system: Using a force triangle on the cross section of the wire, knowing it is a 345 triangle: 8000/4=B/3=D/5 B=6...
  29. P

    How to search a data frame by x and y cords in R

    Hi Readers, I seem to have hit an elementary snag while fiddling in R... i have a 5x5m surface interpolated at intervals of 0.01... giving 250,000 squares in my grid. i have roughly 20-30 xy cords where i want to retrieve the z value out of the data frame. does anyone know how to search an x y...
  30. S

    Use of a non-inertial reference frame in a problem involving rotation?

    Homework Statement A disk rotates with angular velocity ω. It has a groove cut along the diameter in which two blocks of mass m and M slide without friction. They are connected by a light string of length l, fixed by a catch with block m a distance r from the center (r + radius of M = l)...
  31. D

    Reference frame for analyzing ball rolling down incline

    Hi all, I have a question about how to analyze the problem of a ball rolling down an incline plane. Assuming there is friction, at each instant the ball swivels about a pivot point on the incline that is stationary due to static friction. We then would analyze the torques about this point...
  32. Z

    Relativity along an axis in an inertial frame

    Suppose that two events occur on the x-axis of an inertial frame, Δx apart with a time interval between the events of Δt. a) the proper time interval between the events is...? b) the proper distance between the events is...? I think I'm just getting confused by the wording. I imagined that...
  33. R

    Where is the intertial frame of reference applicable?

    (Please forgive me for the obvious stupidity of this question) I'm trying to understand Newton's laws down to the last detail, because that is how I study things. However, where would the principle of inertia ever take place? And since Newton's laws are only applicable in an inertia frame...
  34. I

    Frame of reference - forces in a turn (airplane)

    Hi, I've seen the forces in a turn depicted two different ways: http://selair.selkirk.ca/Training/Aerodynamics/images/lf-turn.gif http://www.free-online-private-pilot-ground-school.com/images/forces_during_turn.gif Which one is correct? I think the first one would be since it's...
  35. A

    Mutual inductance between straight line cable & square shape Frame

    Homework Statement Calculate mutual-inductance between straight line cable and square shape frame, as shown on picture. Homework Equations I am not sure which equation will be used here because as far as my knowledge goes , mutual inductance should be concerned with turns in...
  36. J

    Rotational Kinetic Energy of Body in another body reference frame

    I have two rigid bodies floating in space that are kinematically constrained by a joint (think of a 2 dof link mechanism floating in space). I have a body fixed reference frame on each rigid body plus the global space-fixed reference frame. The first rigid body is in the space-fixed...
  37. M

    Is an Accelerating Reference Frame Valid for Line Follower Robot Calculations?

    I'm attempting to build a line follower robot and I'm currently in the process of building appropriate models. For the control system I need to define a coordinate system. The most convinient coordinate system from many point of views would be a coordinate system that moves along and changes...
  38. S

    Equilibrium of systems in acccelerating frame

    I've drawn the following FBD (using D'alembert prinicple) [The N in my drawing is the F_A stated in the question] ---------------- Assuming my FBD has nothing wrong, am I right to say that I am free to choose my torque equation about ANY POINT? somehow my solutions vary depending on my point...
  39. S

    Bead on a loop in a non-inertial frame

    Homework Statement Consider a bead of mass m on a loop of radius R. The loop is rotating at a constant rate ω. Using a non-inertial frames of reference, find all equilibrium points of the bead on the loop. Homework Equations \vec{F_e}=m\vec{a_r}...
  40. J

    Statics, compute force in member of a frame

    Statics, compute force in member of a frame [SOLVED] Hi guys, I opened this thread but then I saw the mistake and I tried to delete it but I don´t know how, I´m sorry. Homework Statement I´ll show the problem using a picture: Homework Equations Sum forces = 0 Sum moments = 0 M = r x f...
  41. A

    Acceleration in rotating frame understanding

    Homework Statement Not a homework problem but: I am revising rotating frames of reference right now and I know that: a_{inertial}=(\frac{dv}{dt}_{inertial})_{rot}+(w x v_{inertial}) But I cannot seem to understand what (\frac{dv}{dt}_{inertial})_{rot} means; more so the 'rotational' bit...
  42. X

    Physics frame of reference, is this possible?

    Homework Statement Generic collision question. For example, let's say you are asked the following question: Object 1 is 10kg and is traveling at 10 m/s [right] Object 2 is 5kg and is traveling at 2 m/s [right] Find their final collisions after impact Homework Equations m1v1 +...
  43. M

    Total linear momentum does not conserved as viewed from other frame?

    Relativitic momentum p =γ m v Consider explosion happens with two particles of equal mass m moving in opposite directions with the same speed. So, the total momentum before and after explosion is zero and conserved. However, if I try to calculated the total momentum before and after...
  44. S

    Frictionless ball in a rotating reference frame.

    Homework Statement Imagine that a circular disc is rotating with a frictionless ball on it( ball is not at center of the disc) If we observe the motion of the ball from the rotating frame of reference, then how can we describe its motion? Homework Equations The Attempt at a...
  45. Sneakatone

    Find final velocities in the reference frame to the ground.

    for the 1st two I used v is to the reference frame = 37m/s- -35m/s=72m/s a)ball=[(m2-m1)/(m1+m2)]v bat=v2=[(2m1)/(m1+m2)]*v b) I do not know how to solve for part b. The Attempt at a Solution
  46. M

    Blackbody Radiation and Motion: Exploring the Dynamics of Inertial Frames

    I just confused myself with this idea, need someone to fix it please! Say a spherical black body temperature T is moving with velocity v in some direction through some medium with a lower temperature. In the sphere's rest frame this emission is isotropic, however, in the rest frame of the...
  47. B

    QFT: differential cross section from center of mass to lab frame

    I have the following process: two ingoing particles, a photon hitting a nucleus, and two outgoing particles, the nucleus and a pion. I have computed |M|2 and the differential cross section in the center of mass frame dσ/dΩCM; I now have to go into the lab frame, where the nucleus is initially at...
  48. E

    Do I have to re-define electric field strength in Centre of Mass frame

    So let's say I'm computing the torque as a result of the interaction between two electric dipoles in the lab frame. Let's imagine they are in some electric field. I then do : τ = r×F If I now switch to the centre of mass frame I have to find their position vectors from the COM. Why do...
  49. cyboman

    Total velocity of resting object on earth from universal frame of refe

    I'm interested in calculating the total velocity of an object on Earth from the farthest frame of reference (the observable universe). I apologize that I am not a physics or science major so please bare with me. I've posted on another google forum and was told a few different ideas...
  50. D

    Is the earth in a non-inertial reference frame?

    So I would agree that it has a uniform tangential velocity but would the centripetal acceleration of the Earth put it in a non inertial frame.
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