What is Newton: Definition and 523 Discussions

The Newton is a series of personal digital assistants (PDAs) developed and marketed by Apple Computer, Inc. An early device in the PDA category (the Newton originated the term), it was the first to feature handwriting recognition. Apple started developing the platform in 1987 and shipped the first devices in August 1993. Production officially ended on February 27, 1998. Newton devices ran on a proprietary operating system, Newton OS; examples include Apple's MessagePad series and the eMate 300, and other companies also released devices running on Newton OS. Most Newton devices were based on the ARM 610 RISC processor and all featured handwriting-based input.
The Newton was considered technologically innovative at its debut, but a combination of factors, some of which included its high price and early problems with its handwriting recognition feature, limited its sales. This led to Apple ultimately discontinuing the platform at the direction of Steve Jobs in 1998, a year after his return to the company.

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  1. P

    MHB Is the Newton Raphson Method accurate for finding roots of equations?

    Can someone check this is correct? Using the Newton Raphson method with X0=2 to find the root of the equation: x^3-x-1=0 (correct to 4.d.p) My answer is: f'(x)= 3x^2-1 xn+1= 2-x^3-x-1/3x^2-1 xn+1= 2-2^3-2-1/3(2^2)-1 x1= 17/11 x2= 17/11-(17/11^3)-17/11-1/3x(17/11^2)-1 = 1.3596
  2. Archit

    Help me calculate the speed of the basketball

    Here is the picture for you to understand it better. Please help me calculate the velocity required for the ball. I have already tried it with the formula: displacement = initial velocity(time) + (acceleration)(time2)/2 but cannot since I do not know the initial velocity and the time Please...
  3. Archit

    How do you put force in a projectile equation

    Hi. I need to put the formula F=ma into the projectile formula displacement =(initial velocity)time+acceleration(time2)/2 I've already tried it but can't. Please help me Thanks.
  4. Y

    Newton's Third Law of Motion - Help

    Got it!
  5. B

    Gravity force between Earth and Moon from this angle

    Homework Statement Hello the text is in swedish but ill try my best to translate, What it says is: Determine the resultant force on the moon with regard to thr gravitation force from the sun and the Earth when it's in this position shown in the figure [ picture http://m.imgur.com/AfJOVZo ] J...
  6. Shulk

    How did Newton discover universal gravitational constant?

    I'm curious as to what he did to figure it out *Newton, sorry
  7. J

    Finding speed -- A child on his toboggan

    Homework Statement A child on his toboggan is pulled by his father with a force F of value F=240N,on a ice track making an angle α=30° With the horizontal.the cord that the father is holding makes an angle β=20° With the track.assuming that the system(child,toboggan) has a mass of M=40Kg and is...
  8. Diego Fernandez

    Calculating Net Force results in a final velocity

    Homework Statement As simple as the question may seem, I require some honest help. I'm particularly new to physics. The question is the following: A net force of magnitude 4.0N acts on a body of mass 3.0kg for 6.0 s. The body is initially at rest. Which of the following is the speed of the...
  9. P

    Newtons to Newton meters per second

    Homework Statement Ok so 1000(5.556 m/s – 0 m/s)/0.055 = 101018 Newton’s which is a unit of force. We know the force was applied for 1 foot of travel (.3048meters) Homework Equations So the incorrect conversion would be to multiply by .3048 to get 30790 Newton meters per second. I am missing...
  10. A

    Did Newton write a glossary of physics?

    I once remind having read tha Newton wrote a sort of dictionary or glossary of physics concepts of the time, but did not find any reference to this later. Since I need to know for a history in physics research I would like to know if this has some foundation?
  11. S

    If Faraday invented field concept, how did Newton find g?

    This is Newton's law of universal gravitation. $$F=G\frac{m_1.m_2}{r^2}$$ Gravitational field $$g$$ is derived from this formula $$g=G\frac{m_1}{r^2}$$ This is named gravitational "field" strength. If Newton knew nothing about "field concept" and formulated his formula in the form of "action...
  12. M.Decart

    How did Newton answer this question? (mutual gravitational attraction)

    I didn't study physics in college nor any other science major, but I love physics and read a lot about it. Still I find troubling contradictions in my understanding of Newton's interpretation of gravity. For starters, how can the force of gravity be directly proportional to the two masses? If...
  13. Shablong

    Did Newton assume matter was atomic?

    Hello all, I was talking to a friend of mine earlier explaining why a force acts as if all the mass is concentrated at the center of mass. I know of no other proof than taking the time derivatives of the center of mass. Seeing as this was long before definitive proof of the atomic structure of...
  14. O

    Does Pushing an Object in Space Result in Infinite Kinetic Energy?

    By Newton's second law of motion - inetia,we know that if we push a body in space it will keep moving forever (if nothing stops it) (am I wrong?) but when I think about conservation of energy law I am starting to have problems- let's say that I pushed a body in space,the energy converted into...
  15. S

    Conceptual Newton's Law's Questions - HS Freshman Physics

    NOTE: The following questions are not part of any homework assigned. This is part of finding extra concept-related questions to help me study for my physics unit test. Homework Statement I have conceptual questions, not problems. I'll provide sufficient evidence that I've attempted to think...
  16. W

    Pendulum Equilibrium: Can It Pass Balance Point Twice?

    Consider a pendulum in it's balance point hanging from ceiling. It can swing in all the directions in the space. The pendulum can only swing in a sphere(the string can't bend). Now, is it possible to release the pendulum in a particular height and with a initial condition that in the first...
  17. G

    Original letter in which Newton said "Shoulders of a giant"

    I read about 10 years ago that the context in which Newton said 'I have only seen so far because I stood on the shoulders of a giant' was actually in a letter to a nemesis of his, maybe it was Boyle or Haley, and that in the very next clause he goes on to insult the person he's writing to...
  18. Zack Davis

    Escape Velocity and Gravitational Force

    Hey Guys! I've been doing a few equations in regards to planetary escape velocity and gravitational force. The below links have the escape velocity of listed planet on the left side of the board, the gravitational force between the Sun and given planet on the right side. In the middle of the...
  19. X

    Linearising the Geodesic Deviation Equation

    Homework Statement Write down the Newtonian approximation to the geodesic deviation equation for a family of geodesics. ##V^\mu## is the particle 4-velocity and ##Y^\mu## is the deviation vector. Homework Equations D = V^\mu\nabla_\mu \\ V^\mu\approx(1,0,0,0) \\...
  20. Laurine

    How to Convert 180 Ton to kN/m?

    Hello, can anyone help me to convert 180 ton to kN/m ? Which formula can you use to convert this? Thanks!
  21. L

    Question about Newton third law and NASA article

    I was confused by a NASA pdf document about flight physics. I provide quote from NASA document instructor's flight manual, flight testing Newton's laws. Document is categorized DFRC-X41-1. Did NASA use some fast-and-loose language right there? Imprecise definition of drag using Newton third...
  22. A

    Question about Third Newton Law

    If I jump, I accelerate away from Earth. However, if I drop a human on the ground, he doesn't accelerate away from the Earth. In both cases the force used on the Earth is about the same, but acceleration away from the Earth exists in one case and doesn't exist in another case. Why so? (not a...
  23. S

    What Forces Keep the Crate Stationary in an Accelerating Truck?

    Homework Statement A[/B] crate sits in the back of a truck that is accelerating to the right. The crate does not move relative to the bed of the truck. Draw the free body diagram and sum the forces for the crate only.Homework Equations F⃗ net=ΣF⃗ =ma⃗ fs≤μsN [/B]The Attempt at a Solution...
  24. C

    What is a Newton? Is it correctly understood?

    Hi, If one Newton is defined as the amount of force required to give a 1kg mass an acceleration of 1m/s/s is it then correct to say that "10 Newton is the amount of force required to give a 10kg mass an acceleration of 1m/s/s" and would it be equally as right to say "10 Newton is the amount of...
  25. D

    How Does Angle Affect Force Required to Move a Crate on Concrete?

    Unless otherwise stated, all objects are located near the Earth's surface, where g = 9.80 {\rm m/s^2}. A person has a choice while trying to push a crate across a horizontal pad of concrete: push it at a downward angle of 29∘ , or pull it at an upward angle 29∘. If the crate has a mass of...
  26. avito009

    The Field Equations of Newton: Understanding the Basics

    Am I right when I say during Newton's time there was no idea of fields? Now I have been looking for books and courses which are meant for amateurs. So I came across this video of one of my favourite professors Prof Leonard Susskind...
  27. E

    Units square root of a Newton

    I have a table with several quantities in it, and one of them is \sqrt{T} (T is tension) I have values for this table, and want to put the units next to the values. Something seems off to me about doing this, I guess because they're not integers. Is it correct to say the units are kg1/2m1/2s-1...
  28. Y

    Newton universal gravitation formula, how f is dimensionally derived?

    If f dimensions are ml/t^2, where does t^2 come from in the equation of F = G*m1*m2/r^2 where I believe G to be a constant, m1 and m2 to be masses and r to be the distance between two masses - so length. To dimensionally analyse this then, where would the dimension time come from if I were to...
  29. A

    Using Newton Raphson for Root Finding and Parameters' Estimation

    Goood Day, I have a cubic root equation. I use Newton-raphson for finding the roots. I want to do parameter estimation (tuning of the equation parameters to be able to give better prediction) using experiment data. Can anyone help me on how to do this? Thanks for your anticipated help...
  30. interhacker

    Isaac Newton vs Bill Nye & Neil deGrasse Tyson

    https://www.youtube.com/watch?v=8yis7GzlXNM Personally, I think a Carl Sagan vs Neil deGrasse Tyson battle would have been better. Bill Nye is a great guy but Isaac Newton is in an entirely different league. However, Neil deGrasse Tyson's appearance at the end was good. Who do you think won...
  31. W

    How Can Newton-Raphson Method Solve These Complex Nonlinear Equations?

    The three non-linear equations are given by \begin{equation} c[(6.7 * 10^8) + (1.2 * 10^8)s+(1-q)(2.6*10^8)]-0.00114532=0 \end{equation} \begin{equation} s[2.001 *c + 835(1-q)]-2.001*c =0 \end{equation} \begin{equation} q[2.73 + (5.98*10^{10})c]-(5.98 *10^{10})c =0 \end{equation} Using...
  32. B

    Torque and Newton third's law applied to rotatory motion.

    Homework Statement Two blocks of mass m are suspended on the ends of a rigid weightless rod of length L1 + L2; With L1=20 cm and L2= 80 cm. The rod is held horizontally on the fulcrum shown in the diagram and then released. Calculate the accelerations of the two blocks as they start to move...
  33. A

    Solving Newton's Third Law: Where Am I Going Wrong?

    Please look at picture. Here are my equations: For 10kg: -uk m2 g cosθ -T -m2 g sinθ=m2 a For 20kg: T-m1 g =m1 a Add them: -uk m2 g cosθ -m2 g sinθ -m1 g =(m2+m1) a a= 5 m/s^2 (kinematics equations) Isolating uk gives 3.66! The real answer is 0.16. Where am I going wrong?
  34. M

    Verlinde's paper "On the origin of gravity and the laws of Newton"

    Why did Verlinde in his paper suggest that information is a central concept in the emergence of gravity? I mean why information and not something else?
  35. P

    Does Einstein's Theory of Relativity Apply to Everyday Gravity on Earth?

    Hi my background is in mechanical engineering. I use a little bit of motion physics but not often. Pls excuse any errors or wrong terminology I may use. Einstein's theory of relativity addresses the force of gravity in space time but does it address or apply to gravity on Earth? What creates...
  36. P

    1000 kilo Newton meter (K/Nm) torque

    i want to produce 1000 K/nm of torque using motors and gear , output rpm needed is 30 and 1000 k/ nm of torque 1) motor kva? and rpm ? 2) gear ratio and size ? 3) does it also require flywheel ?
  37. B

    How Do Newton Rings Help Calculate Lens Curvature?

    Homework Statement These are problems from a Newton rings experiment where a lens was placed on a flat surface and the interference patterns created Newton rings. I measured the diameter of the first five rings and then plotted a graph of d^2 against N (number of the individual ring). These...
  38. Giant

    What Mathematics used to be done before Newton? (No Philosophy)

    Ok! So I know Newton and Leibniz invented Calculus independently and today a major part of maths requires calculus. So what mathematics was done BEFORE Newton?? (I mean the type of research.) Any history book suggestions would be priceless. Also there are methods of integration taught like...
  39. G

    What level of mathematics did Newton know when he made his discoveries

    When Isaac Newton discovered the theory of gravity, which is very simple, yet fundamental in its premise: The product of two masses and some scale factor divided by the square of the distance between them gives the force of said masses in Newtons. Am I right to assume Newton only knew of Algebra...
  40. S

    Newton's Discovery of f ∝ Δp/Δt

    How did Newton come up with f ∝ Δp/Δt ??
  41. evinda

    MHB No problem! Always happy to help with math questions.

    Hello! :) The interpolating polynomial that interpolates at the following data: $f(5)=?,f(8)=14,f(12)=214$ is $4,125x^{2}-32,5x+10$. The corresponding interpolating polynomial in the Newton form is $p_{2}(x)=a_{0}+a_{1}(x-5)+a_{2}(x-5)(x-3)$.Which is the value of $a_{2}$? Is it 4,125 because...
  42. T

    Newton law of universal gravitation

    Homework Statement Having problems on the method of calculating the acceleration due to gravity of the planet. A certain planet has a diameter of 1715 km and a density of 5254 kg/m³. The planet has a moon that orbits every 4.46 earth-days. What is the acceleration due to gravity...
  43. A

    Is any good way on how to deal with Newton Mechanics?

    just asking, because it seems abstract and complicated for me.
  44. A

    Newton Raphson method and Fixed Point Iteration method ?

    Hi everyone, I has been learning numerical method recently, i am very wonder how fixed point iteration method and Newton raphson method works (a more insight explanation rather than mathematical proof ) thanks!
  45. T

    Matlab help. Using Newton Raphson

    Homework Statement Two forces P and Q are applied at the end of a screw eye in order to remove the post. Homework Equations The two equations that were found are 1.) Q*sin(30)-P*sin(θ)=0 2.) Q*cos(30)+P*cos(θ)-800=0 The Attempt at a Solution I combined the 2 equations by first...
  46. T

    Writing Matlab program for Newton Raphson

    Homework Statement Two forces P and Q are applied at the end of a screw eye in order to remove the post. 1.)variations (plots) of P and Q versus (theta) for a given value. R=800 N 2.) for what value of theta we obtain P=Q? Homework Equations...
  47. T

    Einstein vs Newton: Who is the Superior Physicist?

    Who would you choose as the superior physicist ,Einstein or Newton?(judging from their intellect and accomplishments),Russian physicist Lev Landau had a list ,in which Newton was first .Is there an intellect superior to either of them?
  48. H

    Comparing Newton and Einstein - Who is Correct?

    As I see,I will show you something and I want to explain me who has right. For example into the run a human walk with 5km/h while the train runs with 100km/h,in the same direction. So Newton says: U=V1+V2=5+100=105km/h Einstein,about his law for big speeds says...
  49. H

    MHB Newton Rhapson Failure Analysis

    Hi, My name is Hari and i am new to this forum. I am currently working on a research problem using Newton rhapson method to find solution for a system of non-linear functions. The precise application is Inverse Kinematics of manipulators. However, i have three non linear equations function of...
  50. S

    Solving Newton's 2nd Law: Wx = W Sin θ

    Hi, Can someone please explain to me why Wx (in the attached diagram) will be W sin theta instead of normally as W cos theta? I don't really understand the explanation that was given - "it is more useful to express the components of W in terms of the angle theta which the inclined surface...
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