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. R

    Need help on Newton's Law Question and Determining speed

    <Mentor's note: moved from a technical forum, therefore no template> My teacher made this question: Iceman is sliding down a 10.0 x 10^(-8) nm ice that is inclined at 20.0 degrees with respect to the horizontal. Iceman is initially at rest. The coefficient of kinetic friction between iceman's...
  2. V

    I Product rule in Newton notation?

    What is the correct way to write the product rule in Newton notation (with the dots above)? It is the LHS I am abit confused with. Eg. Say you have d/dt(xy) would you just put dots above the x and y?
  3. R

    Calculate force with speed and mass....

    Hi forumners, is it possible to calculate force in Newtons given speed and distance? Or if I have to, I would say the ball weighs approximately 3kg? Thank you in advance.
  4. J

    Two questions on Newton Fluxions

    Hi folks, I have two questions: 1.- I am reading his Method of fluxions and when he writes x with a dot over the letter, Does he mean the differential of x, or what we say dx? In other words, Is that an infinitesimal quantity "smaller than any other fixed number"? I ask because I have read...
  5. A

    Maximum force so object on top wouldn't start sliding back

    Homework Statement Box B is on top of box A. Box A has a mass of 1 kg, B has 0.3 kg. Coefficient of friction between ground and box A is 0.5, between box A and B : 0.75. With what maximum force can I pull box A without box B sliding back ? m1 = 1 kg m2 = 0.3 kg u1 = 0.5 u2 = 0.75 Homework...
  6. R

    Jumping straight up while skateboarding downhill

    Hi, I understand the mechanics of jumping straight up and landing on the same spot when inside of a moving bus traveling at a constant velocity but what happens when I jump straight up when skateboarding downhill? Do I land on the same spot on the skateboard, do I land further back relative to...
  7. S

    Root-Finding method in MATLAB

    Homework Statement Compute and plot the compressibility factor (y) verses pressure (x) for the (1) Van der Waal’s (2) Redlich-Kwong and (3) Peng-Robinson equations of state. Compressibility Factor, Z = (P*v)/(R*T); where v is the specific volume (V/v). Data for n-Butane: T = 500 K; Tc = 425.2...
  8. R

    MHB Find General Form of Z & T: Newton's Law of Cooling

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  9. W

    Help needed -- Analysis of torque and force on turning vehicles

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  10. Z

    Bernoulli vs Newton - air flow characteristics

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  11. H

    Finding where the gravitational field strength is 0

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  12. L

    Solve Newton Interpolating Polynomial for Error

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  13. kidgt23

    Forces of motion, Newton 2nd law

    Homework Statement An 8.5 gram slug is fired East from a 0.357 magnum hand gun held 1.5 meters above the ground. The muzzle velocity (as the projectile leaves the gun) is 1400 ft/sec. The bullet is accelerated at a constant rate as it travels through the 10 cm long barrel. After leaving the...
  14. ChrisBrandsborg

    Finding Acceleration and Stopping Time in a Multi-Block Lifting System

    Homework Statement A lifting system can be modeled as two blocks of mass m1 and m2 hanging from two pulleys, connected by ropes to a third block of mass M = 100 kg, lying on top of a horizontal surface. There is gravity g = 9.80 m/s2. a) Ignoring at first friction, find an expression for the...
  15. honlin

    What is the reading on a scale when a chain falls onto it?

    Homework Statement A chain of mass M and length L is suspended vertically with its lowest end touching a scale. The chain is released and falls onto the scale. What is the reading of the scale when a length of chain, x , has fallen? (Neglect the size of individual links.) Homework Equations...
  16. Akshat

    Exceptions to the Laws of Physics: Newton's Third Law

    I've been noticing that there are exceptions to every scientific law. For Example, with Newton's First and Second Laws are totally invalid at the quantum level, but I'm failing to find such an example for Newton's Third Law. Is anyone able to help me?
  17. N

    How Do You Calculate Skier's Mass and Acceleration with Newton's Second Law?

    Homework Statement A skier glides down a slope, and has at the bottom of the slope, at the beginning of a horizontal piece, a velocity of 30 m / s. He begins to brake and after 4 seconds later has a speed of 10 m / s. The friction between the skis and the snow is 400 N during braking. a. What...
  18. M

    A Need help with satellite navigation? Any textbook recommendations?

    Hey guys, looking to get some advice on satellite navigation. Can anyone recommend a nice textbook covering Newton, Kepler, Lagrange etc and their contributions to orbital motion. Also any textbooks on MATLAB or Maple examples of orbits - relativistic or Newtonian it doesn't matter. Not put off...
  19. Zack K

    Gravitational field strength at a point

    Homework Statement What is the gravitational field strength at a point 6.38x106 m above the Earth's surface? Homework Equations The Attempt at a Solution Ok so I plug in all the known variables. G= 6.67x10-11. M= 5.98x1024. r= 6.38x106 and so I multiply that by 2 because the given point is...
  20. A

    HW questions about Forces with ball examples

    Hey all, I'm don't have the firmest grasp on physics and a little help would be much appreciated! So two questions: 1)a physics student watching a tennis match states, "while the ball is in contact with the racquet, the racquet exerts a larger force on the ball than the ball does on the...
  21. Jonathan Scott

    News The late Prof Sir Tom Kibble awarded Isaac Newton medal

    http://www.bbc.co.uk/news/science-environment-36675894 On a personal note, he was very kind and encouraging when I spoke to him about some of my unconventional ideas about physics when I was a student (on the Computing Science course) at Imperial College in the 1970s.
  22. O

    A Lagrange vs Hamilton: Clarifying the Distinction

    Hello, When doing a little internet search today on generalized coordinates I stumbled on this document: http://people.duke.edu/~hpgavin/cee541/LagrangesEqns.pdf If you are willing, would you be so kind as to open it up and look at the top of (numbered) page 6? OK, so the very existence of...
  23. D

    Normal Acceleration of a Thrown Ball: What Is It?

    Homework Statement a ball is thrown from some height horizontally with some velocity. After 1 second what is its normal acceleration? Ignore air friction Homework EquationsThe Attempt at a Solution I was absolutely certain that it is 10m/s2 couse that doesn't change and it has no acceleration...
  24. J

    An application of free fall (DE) model to industry

    Could someone tell me an application of the model of free fall to industry or more generally by using Newton's second law and the law of gravitation, construct a model similar to the free fall one, that has an application in industry
  25. defaultusername

    Tension and Angle Analysis for Traction in a Broken Leg

    Homework Statement An accident victim with a broken leg is being placed in traction. The patient wears a special boot with a pulley attached to the sole. The foot and boot together have a mass of m = 4.0 kg, and the doctor has decided to hang a 6.0 kg mass from the rope. The boot is held...
  26. M

    How did Newton come up w/ 1st law? Why does friction exist?

    So I'm trying to understand Newton's laws, and I know that friction is supposed to be the force that stops an object in movement. But I don't really understand why this is the case, as the force of friction is not something that can be perceived intuitively (unlike, for example, the force I...
  27. W

    How much credit does Newton deserve?

    I'm well aware that Newton was revolutionary, but how much of calculus and his model of gravity can be solely credited to him? I've read that calculus was invented in fragments all around the world and that Newton used Kepler's laws as an influence to his gravity equation.
  28. E

    Can a Stone Remain in Circular Motion if Tension Equals Zero Before Velocity?

    Let's say I have a stone tied to a string and I'm spinning it vertically. Now, if I provide an initial velocity such that the velocity of the stone = 0 at an angle greater than 0 from the horizontal(visualize it in the "first quadrant") the eq of motion would be: T+mgsin (theta) = mv^2/r. If the...
  29. I

    Is it possible to see Newton rings in CT (xray) images?

    I have seen what looks like Newtons rings interference pattern in transverse CT images of 2 solid water block on top of each other. My understanding is that Newtons rings occur in visible light eg photography or scanners. Can anyone shed some light on this? :)
  30. E

    Tension is causing me to be tensed

    There's two questions about tension(the force), that no matter how much I try to find answers to and understand since the past few days, I'm simply not able to. Any help in this matter would be highly appreciated. 1) If person A and person B are holding a rope, and person A applies 100N of...
  31. E

    Understanding Newton's Third Law: Exploring Confusion and Misconceptions

    I am not the best at drawing, I know. If A exerts a force of 200N on B, then by Newton's third law, 200N would be exerted on it. Similarly, if B exerts 100N on A, by Newton's third law, 100N would be exerted on it. Then why wouldn't both accelerate in opposite directions with accelerations equal...
  32. E

    Conceptual question about Newton second law

    Homework Statement There are two forces on the 2.08 kg box. F1 is 20.5N. acceleration is happening in the third quadrant with a magnitude of 12.1m/s^2 and with an angle of 25.9 (in the third quadrant). Find the second force in vector notation. Homework Equations Fnet=ma The Attempt at a...
  33. E

    Solving this question from an inertial FOF

    Homework Statement Need to find the time t taken for m to reach the bottom Homework Equations F = ma The Attempt at a Solution [/B] I don't know how to go about solving this from an inertial frame. In my view, the only two forces acting on this block are mg, which has a mgsin(theta)...
  34. E

    Pseudo forces and negative acceleration

    Homework Statement Homework Equations F = ma The Attempt at a Solution [/B] I already have the solution, however, I have a few questions. 1)In the solution they have taken m2's acceleration relative to the ground to be a0-a downwards. However, if a>a0, then wouldn't the acceleration...
  35. E

    (somewhat complex inclined plane problem) why is this wrong?

    Note:- All surfaces given here are frictionless. To find:- Acceleration a Relevant eqs:- F = ma Attempt at solution:- The equations I've gotten so far:- 1) N1sin(theta) = m2a 2) m1gsin(theta) = m1a1 3) m1gcos(theta) - N1 = m1a2 So far, 3 eqs, 4 unknowns. For the 4th eq, I did a2sin(theta) =...
  36. E

    B Which of the two is the reason a block slides down a wedge?

    Is the reason the block slides down the plane that the resultant of the normal force N and mg acts along the plane causing it to slide or is it because of the component of mg parallel to the plane acting on the box i.e. mgsin(theta)
  37. E

    B How can gravity have a horizontal component?

    In the above case, mgcos(theta) is the component of gravity perpendicular to the surface of the wedge. Considering all surfaces to be frictionless, the horizontal component of the normal force would cause the wedge to accelerate towards the right, and the horizontal component mgcos(theta)-the...
  38. E

    Equation to express the effect of velocity on mass

    hello all. I am running a pet project that involves trying to get the equation for universal gravity to express the effect of velocity on the mass. (I don't want this equation as in trying to create it my self) however I cannot find an equation that describes the effect of velocity on mass. any...
  39. malaxtom

    Particle dynamics applied to geometrically parametric line

    I have an odd, yet intriguing question. I want to describe a particle that is constrained to move along a straight line in the x direction. The location of the particle can be described with theoretically infinite parametric parameters, d, along the line. For example: R = [d 0 0]T R = [d2 0 0]T...
  40. P

    B Understanding Gravity & Orbits in Light of Relativity

    I've been re-reading Hawking's Brief book (for the fourth time :-) and trying to understand a bit more. He discusses how General Relativity tell us that the planets don't orbit due to gravity, but due to the bending of space-time by mass/energy. That in fact, they are actually following a...
  41. Jadaav

    Designing a reflection sundial for the southern hemisphere

    Hello, My aim is to build a small reflecting sundial as designed by Sir Isaac Newton. I found from a website that it consists of a ceiling and a small mirror. What I want to know is how it works, the concepts behind it and how to build one. It's for an undergraduate project that I've got...
  42. R

    Calculus - Related Rates Problem

    Question: Two bikers leave a diner at the same time. Biker Slim rides at 85kmh [N] and Biker Haug rides at 120kmh [NE]. How fast is the distance between them changing 40 minutes after they left? I suggest looking at my photos of the triangles and such, as explaining it over text can be a bit...
  43. Ameer Bux

    Newton's Laws -- Your best tip

    Hi guys. I am planning to get 100 percent for my upcoming physics test in two days time. I am i grade 11. The test is based on Newtons 3 laws and universal law of gravitation. What are some of the best tips you can offer from your experience to help me achieve my goal?
  44. heartshapedbox

    Newton's first law, forces, charges

    Homework Statement Two uniform masses of .260kg are fixed at points A and B. Find the magnitude and direction of the initial acceleration of a uniform sphere with mass 0.01kg released from rest at point P that is acted on the gravitational forces of attraction from spheres A and B. The diagram...
  45. A

    Force: F=ma & Effects on Momentum

    I'm getting confused with the concept of force. I know f=ma. this could be interpreted in this way "the force required to make an object accelerate by a given amount depends on its mass" or the "if an object which with a mass m has a force f being applied on it its acceleration will be a. But...
  46. C

    Translate change of length to force in hanging chain problem

    I'm trying to write a simple script in blender python in order to show load deflection in cloth simulation. My question is: Is it possible to translate the change of length (distance between two nodes), into a force? (Newton between those nodes)? In addition you will find a minimal example. The...
  47. haushofer

    Accelerations: Transformation of Newton potential

    Dear all, I'm taking a second look at the Newtonian limit of GR and the covariance group. My main interest is to see how the Newton potential transforms under the covariance group of Newtonian gravity. I know that the gradient of the potential is given by the Christoffel symbol \Gamma^i_{00}...
  48. S

    LIGO discovery on gravitational waves.

    Could someone please describe the recent LIGO project, gravitational waves and their detection in simple terms. PLEASE.
  49. Cobalt101

    Orbit precessions - General Relativity vs Newton

    What is the underlying feature of general relativity that, unlike Newtonian mechanics, results in the correct calculation of orbits i.e. including precession (e.g. Mercury). I not asking for the mathematics (i.e. the additional term in the equation) but rather what underlying "physical"...
  50. B

    What force causes a body to move into the windshield when a car suddenly stops?

    Homework Statement This is not a specific problem, I was just wondering, what unbalanced force acts on your body when you are in a car traveling at a constant velocity and the car comes to a sudden stop? This has to do with Newton's First Law, but I'm unsure of what force applied to your body...
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