What is Newtonian: Definition and 336 Discussions

The Newtonian telescope, also called the Newtonian reflector or just the Newtonian, is a type of reflecting telescope invented by the English scientist Sir Isaac Newton (1642–1727), using a concave primary mirror and a flat diagonal secondary mirror. Newton's first reflecting telescope was completed in 1668 and is the earliest known functional reflecting telescope. The Newtonian telescope's simple design has made it very popular with amateur telescope makers.

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  1. M

    Newtonian mechanics on curved spacetime

    The spacetime model of Newtonian mechanics is a fiber bundle with a one-dimensional base space (=time) and a 3-dimensional fiber (=space). On the tangent bundle of the spacetime a curvature-free connection is given. Newton's 1st law states that free pointlike particles move on geodesics...
  2. U

    Newtonian Physics Lab- Uncertainty and Angular Momentum

    Before I begin, let me say this is my first time on this forum, and am terribly sorry if I screw something up here. Let me also say that my physics lab is ahead of my physics class, so my knowledge on angular momentum is lacking. Also, this lab is due tomorrow. I know it's short notice, but I...
  3. H

    How can I simulate Newtonian motion using C code and graphics packages?

    Homework Statement http://img399.imageshack.us/img399/4277/cartyf8.jpg http://g.imageshack.us/img399/cartyf8.jpg/1/ Homework Equations Euler's Method, Runge Kutta 4th Order Method The Attempt at a Solution I have solved the motion equation for the above question using Euler's Method and...
  4. K

    Scientific Revolution: Newtonian Physics - gravity waiting to be discovered?

    Homework Statement Im doing a philosophy, history and politics of science subject and the question is whether gravity was waiting to be discovered or was it an intellectual construct particular to the 17th century and Newton. Homework Equations The Attempt at a Solution I'm...
  5. A

    Exploring Newtonian Limit for FRW and Oppenheimer-Snyder Collapse

    The Newtonian limit for general relativity exists only for the asymptotically flat spacetimes. FRW case definitely not asymptotically flat. SO the Newtonian limit should not exist for it. However we have Newtonian theory of cosmology in homogeneous and isotropic universe. So my question is...
  6. 8

    Modifying Newtonian Gravitational Force

    This Brownstein/Moffat paper (arXiv:astro-ph/0702146v3, 13 Sep 2007)) looks interesting to me but it's too deep for me to really understand. The gist of it seems to be: ===quote=== The alternative to the dark matter paradigm is to modify the Newtonian 1/r2 gravitational force law so that the...
  7. B

    Principle of Newtonian relativity

    Homework Statement In a lab frame of reference, an observer finds Newtons second law is valid in the form of Fnet=ma. Show that Newtons second law is not valid in a reference frame moving past the laboratory frame of problem 1 with a constant acceleration a1. assume that mass is an invariant...
  8. 5

    Help Newtonian mechanics and Bernoulli/Venturi effect in generating lift

    Hello, this question is about lift in fixed wing flight (airplanes). Is it possible to calculate separately the lift generated by: - Newton's laws (wings deflecting air particles) - Bernoulli effect (difference in air pressure above and below the wings caused by the shape of the...
  9. Q

    Newtonian Gravitation Paradox ?

    Consider two point mass particles m1 m2 (with m1 different from m2) initially stationary relative to each other a distance x apart . The only force acting on them is attractive Newtonian gravity, i.e. Gm1m2/x^2 acting equally in opposite directions along the line of separation between the...
  10. M

    Newtonian Physics & Relativity: Work & Energy

    Is it correct to say that the core idea of energy as the ablity to do work is the same for Newtionian Physics and Relativity?
  11. J

    Newtonian mechanics and inclined planes

    hi, i am interested in finding a website which has lots of questions (and solutions) on Newtonian mechanics to test my knowledge. things i had in mind include applications of F=ma,inclined planes, tension on ropes,springs etc. thanks
  12. A

    GR explanation of Newtonian Phenomena

    1. How would a general relativist explain why an object falls towards the earth? 2. Is it correct to say that it is not the apple that falls towards the Earth but it is the Earth that accelerates towards the apple? Why is this ok to say?
  13. U

    Newtonian & Einstein Quantum Mechanics

    Homework Statement I have a paper due Friday in ap Physics and i can't seem to find anything on the subject that doesn't involve reading an entire textbook. Ok so we first must compare/contrast Newtonian & Einstein Physics, then explain their contributions to Quantum mechanics. The...
  14. T

    How can Newtonian gravity be converted to m/s without prefix?

    Before I inundate you with various elementary problems I'm facing, I need help with the concept. Fgrav=(GMm)/(r^2) So Fgrav is in units of Newtons, correct? How would one convert that to m/s?
  15. M

    Problem involving Newtonian Gravity and a tunnel through the Earth

    Homework Statement The problem is: Consider a tunnel that connects any two points A and B on the spherical Earth (assuming constant density). The tunnel is a vacuum, and the train traveling through the tunnel is traveling on a frictionless track with no engine (i.e. it is just falling through...
  16. X

    GR explanation of Newtonian Phenomena

    1. How would a general relativist explain why an object falls towards the earth? 2. Is it correct to say that it is not the apple that falls towards the Earth but it is the Earth that accelerates towards the apple? Why is this ok to say? Is it because, in GR, there are no preferred...
  17. F

    Difference between Newtonian, Langrange, and Hamiltonian Mechanics

    Hey I was just wondering what the differences between the three forms of mechanics were. I've only studied basic Newtonian mechanics so I'm not really sure about the other two. Could anyone elaborate?
  18. M

    Newtonian Mechanics - single particle

    Homework Statement The speed of a particle of mass [m] varies with the distance[x] as v(x)=ax^(-n). Assume v(x=0)=0 at t=0. a)Find the force F(x) responsible b)Determine x(t) c)Determine F(t) Homework Equations The Attempt at a Solution My solution to part a is F(x)=-ma^2nx^(-2n-1)...
  19. F

    Newtonian mechanics VS. variational principles

    Hello! Would you say that the following text is true from beginning to end?: ----------------------- Basically, there are two mechanical approaches to describe a particle: (a) the variational principles (e.g., the Lagrangian and Hamiltonian ones) and (b) the Newtonian approach. The former...
  20. W

    Guide to Learning Newtonian Mechanics

    What books would you recommend as good books for learning theory of physics. My focus is on Newtonian mechanics. Any other books with good problems to solve will also be nice. As of now I have the feynmann lectures on physics in PDF format which I printed. Very nice although I'd like a little...
  21. S

    Newtonian perturbations to Minkowski

    The Newtonian gravity limit of GR is represented by a perturbation to Minkowski metric: ds^2 = - (1+ 2\Phi(x,y,z,t)) dt^2 + (1-2 \Phi(x,y,z,t))(dx^2 + dy^2 + dz^2) The geodesic equations of this metric correctly reproduce the Newtonian equations for acceleration of a test particle in...
  22. L

    Solutions to Newtonian gravity

    I've only just completed high school, but I have a decent grasp on basic undergrad maths/physics. After hours and hours of paper and mental calculations, I still can't see a way of solving Newton's law of gravitation for the path of a body given inital position/velocity i.e. the second order...
  23. S

    Exploring the Newtonian Limit of LCDM in Astrophysics: A Comprehensive Overview

    Is there an article about the Newtonian limit of LCDM? The LCDM vacuum is deSitter not Minkowski and they have to expand around that so I think nonzero cosmological constant will make a difference. Give references if you know anything.
  24. S

    Newtonian Limit of GR: Experimentally Constraining k in the Einstein Equation

    According to the official textbook version, the coefficient of proportionality k in the Einstein equation: R_{\mu\nu} - \frac{R}{2} \, g_{\mu \nu} = k \, T_{\mu \nu} is fixed by requiring the equation boils down to Poisson equation for some kind of self gravitating fluid: \nabla^2...
  25. J

    Use Newtonian dynamics to find the speed at this position

    I need some help with this hwk! Please someone help me...:confused: A certain spring is found not to obey Hook’s law; it exerts a restoring force if it is stretched or compressed, where α = 60.0 N / m and β = 18.0 N / m2. The mass of the spring is negligible. (a) Calculate...
  26. A

    Modified Newtonian Dynamics

    Homework Statement For very low rates of acceleration, Newton's 2nd law has to be modified where F<vector>=m*f(a/a0)*a<vector>. For "small" values of a<vector>, f(a/a0) = a/a0. Determine the component equations of motion for the case of f(a/a0) = a/a0 in polar coordinates (don't try to solve...
  27. L

    Affine space or fibre bundle: spacetime formalism in Newtonian mechanics

    Hi, I was wondering, which spacetime model do you prefer for Newtonian dynamics? VI Arnold constructs it on an affine space \mathbb{A}^4 with an Euclidean space \mathbb{E}^3 defined on each time cross-section. The construction of time is somewhat cumbersome, involving defining \mathbb{R}^4 to...
  28. C

    Newtonian Gravity: Describing as Vector Field

    how would you describe Newtonian gravity as a vector field?
  29. L

    Newtonian Mechanics: Forces & Acceleration Explained

    Okay, I'm sort of confused about forces and acceleration here. Does any force cause an acceleration? What if the force is constant? So does it depend on the situation of the applied force to see if the object accelerates? For example, if you apply a constant force on an object at rest, then the...
  30. A

    Poiseuille law and the Newtonian force

    Can anybody write me how to show the similarities in the Poiseuille law and the Newtonian viscousity force?
  31. B

    Can you explain and comment on the Newtonian viscosity equation?

    Could anyone explain me and comment the Newtonian viscosity equaton?
  32. B

    GR explanation of Newtonian Phenomena

    1. How would a general relativist explain why an object falls towards the earth? 2. Is it correct to say that it is not the apple that falls towards the Earth but it is the Earth that accelerates towards the apple? Why is this ok to say? Is it because, in GR, there are no preferred reference...
  33. C

    General Relativity: Comparing Newtonian and Einstein Circular Orbits

    i am a physics enthusiast studying general relativity on my own with the book: "Exploring Black Holes: Introduction to General Relativity" by Edwin F. Taylor and John Archibald Wheeler. I am having the hardest time with the fourth chapter of the book and especially the 4th question in that...
  34. S

    Mathematica Mathematica notebook for conversion to Newtonian metric ?

    Basic postulate of GR is that locally spacetime looks flat i.e. any metric can be reduced to a local inertial metric at a point. The local inertial metric is exactly the flat Minkowski metric AT the point, and has zero derivatives AT the point but those are not true away from the point. Then...
  35. U

    General Relativity vs Newtonian Mechanics

    I am involved in a discussion about non-locality in QM. I'm arguing that it is possible for a local mechanism to emulate a non-local one and the best example I could find is gravity (the apparently non-local force required by Newtonian gravity being explained by a local mechanism in GR). My...
  36. R

    What happens when a person punches a spinning wheel on a skateboard?

    Hello, Say you have a frictionless setting. In this setting are two skateboards. One has a waterwheel (or any wheel with fins) propped up on beams so that it is on the skateboard and can freely turn. On the other skateboard is a person standing on it. If the skateboards are one behind the...
  37. Q

    Is the Newtonian theory still being used?

    The Newtonian theory is strictly speaking false and it has been superseded by the theory of relativity. However, it is more simple and easier to apply than the theory of relativity. Also, in some situations, the results do not differ significantly. The question is: is the Newtonian theory still...
  38. F

    Third Newtonian law most fundamental

    third law is equal and opposite reaction . . . the first law is inertia of mass. From everything I can remember reading, people often talk about the mystery of inertia in bodies . . . well, i finally got around to thinking about this stuff(admittedly), and it seems to me that the first law is...
  39. Jonathan Scott

    Integral of pressure over Newtonian star

    Homework Statement Last part of MTW Gravitation exercise 23.7: Calculate in Newtonian theory the energy one would gain from gravity if one were to construct a star by adding one spherical shell of matter on top of another, working from the inside outward. Use Laplace's equation d(r^2 (d...
  40. P

    Newtonian Solution to Compton Scattering

    Homework Statement I need to derive the Compton scattering formula using Newtonian mechanics, I have it done in relativistic mechanics but can't get the Newtonian version. Homework Equations the solution to the relativistic equation is 1=mc^2(1/E2-1/E1)+cos(theta) for Newtonian...
  41. Schrodinger's Dog

    Good books about Newtonian mathematics.

    Any one recommend some good books about Newtonian maths, his theories etc, Calculus, Liebnitz ,whatever, or any entry level calculus books? I'm asking on behalf of a friend who wants to get back into maths, so it should be from an introductory level and up? I learned mine from textbooks, that...
  42. P

    Newtonian mechanics - extended rigid body's rotation, moment of inertia

    Homework Statement Figure shows the cylindrical skater, http://hk.geocities.com/puipui_queen/cylinder_skater.jpg as she spins,she may be modeled as a homogeneous cylinder of raduis R, height h, and density p, with outstretched arms. The arms are cylinders as welll, also of density p...
  43. I

    Black Holes in a Newtonian (non-Einsteinian) World

    I'm just wondering... how would this work out? What would happen, for example, if an object goes past the event horizon of a black hole in a Newtonian universe? Or is this where Newtonian mechanics breaks down and we need General Relativity to explain it? (P.S. I am a high school student with...
  44. S

    Newtonian tidal acceleration tensor in polar coordinates

    I'd like to understand how to calculate the components of Newtonian tidal accelaration tensor in polar coordinates. Is any available Internet source which clearly explains the technique with details? Reading James B. Hartle "Gravity" textbook I stumbled on the following Example from...
  45. T

    A paradox inside Newtonian world

    Three weeks ago I have constructed this apparent paradox inside the Newtonian world. http://critticall.com/alog/Antinomy_inside_mechanics.pdf" Am I wrong or not? What's your say? - Thomas
  46. M

    Newtonian derivation of Friedmann equation

    I'm trying to derive Friedmann's equation for cosmology using Newtonian physics. I've got the force equation F=ma for the case without a cosmological constant. But now I'm trying to incorporate the cosmological constant into this force equation. But I'm having trouble seeing how the...
  47. N

    Newtonian mechanics, incline, acceleration FUN

    "Two boxes, m1=1.0 kg witha coefficient of kinetic friction of 0.10 amd m2=2.0 kg with a coefficient of 0.20, are placed on a plane inclined at 30 degrees. (a) What acceleration does each box experience? (b) If a taut string is connecting the boxes with m2 farther down the slope, what is the...
  48. L

    Formalism of Newtonian Mechanics

    Hi, I was wondering, how would one formulate Newtonian Mechanics as a rigorous mathematical model? Would one take force to be an external quantity defined by various force laws (Coulomb, UG) and accept Newton's Second Law of Motion as an axiom (and first law as a definition of inertial...
  49. siddharth

    Flow of a Newtonian fluid down an inclined plane.

    I'm basically reading on how the velocity profile is found for a laminar flow of a Newtonian fluid down an inclined plane surface. (x is along the incline, y is perpendicular to the incline) The assumptions being made are - The fluid is Newtonian - It's laminar - It's fully developed - It's...
  50. K

    What is the acceleration and sliding time of a car on a rotating platform?

    A car is driven on a large revolving platform which rotates with constant angular speed w.At t=0, a driver leaves the origin and follows a line painted radially outward on the platformwith a constant speed v0.The total weight of the car is W,and the co-eff. of friction between the car and the...
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