Newtons Definition and 502 Threads

The newton (symbol: N) is the International System of Units (SI) derived unit of force. It is named after Isaac Newton in recognition of his work on classical mechanics, specifically Newton's second law of motion.
A newton is defined as the force which gives a mass of 1 kilogram an acceleration of 1 metre per second, per second, 1 kg⋅m/s2.

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  1. N

    How large is the normal force? (applying Newtons laws phys )

    how large is the normal force? (applying Newtons laws phys 1111) A 23 kg child goes down a straight slide inclined 38 degrees above horizontal. The child is acted on by his weight, the normal force from the slide, kinetic friction, and a horizontal rope exerting a 30 N force as shown in the...
  2. M

    Am i right on this? Newtons secocd law hw problem

    this is from ch 4 of cutnell & johnson physics when you add forces together such as the ones in the problem below, how do you know which ones are positive and which ones are negative? does it have to do with their relation on the xy axis? or does it have to do with the direction the object is...
  3. Z

    Help with a Newtons Cooling Law Problem

    Homework Statement A thermometer reading 70o F is placed in an oven preheated to a constant temperature. Through a glass window in the over door, an observer records that the thermometer reads 110o F after 1/2 minute and 145o F after 1 minute. How hot is the oven.Homework Equations...
  4. M

    How Can You Calculate the Force of Impact Without Knowing All Variables?

    I have a scenario which is simply a ball hits the ground from above i know the mass of the ball and the speed in mph of the ball just before it hits the ground. No other variables are known, I need to know the force it hits the ground. What is the best way to calculate it? I had thought F =...
  5. B

    What does Newton's universal constant mean and how is it used?

    Newtons universal constant is very complicated due to that i am new to modern Earth science i searched on the net and the results were countless here is the common answer 1-G=6.67*10(squared negative 11)m(cubed)kg(squared negative 1)s(squared) someone please tell me what all this means and how...
  6. D

    How Does Centripetal Force Relate to Distance in Orbital Motion?

    Homework Statement Newton showed that a centripetal force acts on an object moving in an orbit that varies A. directly with the distance from the centre of force B. inversely with the distance from the centre of force C. directly with the square of the distance from the centre of...
  7. T

    Are Plumber Blocks Strong Enough for 880 Nm of Torque?

    hello forum members, I,m new to this forum and was hoping some one can help me? I work with industrial fans, we use a steel built frame with the shaft & bearings located in an housing called "plumber blocks" that are on top of the steel frame. The blocks are bolted down using 16mm bolts that...
  8. C

    Applying Newton's Laws: Crate on an Inclined Ramp

    Homework Statement In the figure, a crate of mass m = 96 kg is pushed at a constant speed up a frictionless ramp (θ = 27°) by a horizontal force F. The positive direction of an x-axis is up the ramp, and the positive direction of a y-axis is perpendicular to the ramp. (a) What is the magnitude...
  9. 1

    Help with Newtons Second Law Question Please.

    Homework Statement Calculate the force needed to accelerate a 2.0kg ball at 3.0ms^2 (A) In space, a long way from Earth. (B) On a frictionless horizontal surface, near the surface of the earth. (C) vertically upward, near the surface of the earth.Homework Equations F = m*a The Attempt at a...
  10. K

    Newtons law of motion type of question

    Two forces, of magnitude 10N and 4N, are applied to an object. The relative direction of the forces is unknown. The net force acting on the object __________. Check all that apply ? a) cannot be equal to 5N b)cannot be equal to 10N c)cannot be directed the same way as the force of 10N...
  11. E

    Applying Newtons laws n an inclined surface with two masses

    applying Newtons laws on an inclined surface with two masses Homework Statement Two blocks connected by a cord passing over a small, frictionless pulley rest on frictionless planes (diagram attached) a) which way will the system move when the blocks are released from rest? b) what is the...
  12. Y

    Quesiton on Newtons Second Law, Need Help.

    Two blocks of identical material(Block1 20kg, Block2 10kg) are connected by a light rope on a level surface. An applied force of 55Nright causes the blocks to accelerate. While in motion, the magnitude of the force of friction on the block system is 44.1N. 2. Homework Equations...
  13. M

    Two Blocks Sliding, Newtons 3rd

    Homework Statement The coefficient of static friction is 0.55 between the two blocks in Figure P8.32. The coefficient of kinetic friction between the lower block and the floor is 0.20. Force FT causes both blocks to cross a distance of 5.0 m, starting from rest. What is the least amount of...
  14. C

    Understanding Newton's 3rd Law: Finding Opposing Forces Between Two Boxes

    I understand the law and can apply it to many situations except for one. You are pulling a box weighing X kg attached by a connection which isn't loose or anything to another box weighing Y kg and you have to find out the strength of the opposing forces inbetween the boxes. Why is there...
  15. Simfish

    How many Newtons of force would kill a person?

    So yes, the atmosphere exerts a force of 100,000 Newtons per square meter. A person's head, is obviously much less than a square meter (probably 0.15 meters on the side, which roughly translates to Pi*(0.15/2)^2 square meters). Anyways, for this matter this is irrelevant, as we are already in...
  16. E

    Newtons laws of motion, tension problem

    Homework Statement Due to a jaw injury, a patient must wear a strap (see the figure) that produces a net upward force of 5.00 N on his chin. The tension is the same throughout the strap. To what tension must the strap be adjusted to provide the necessary upward force? Homework...
  17. P

    Newtons Laws with mouse and elephant

    Homework Statement A mouse and an elephant are on a perfectly flat ice rink (no friction). 10N of force is applied to each animal for 10 seconds, describe their behaviour. Homework Equations F=ma The Attempt at a Solution Both animals will accelerate immediately and continue...
  18. P

    Approximate Speed of Object Dropped from Height h with Variable Gravity

    Suppose an object is dropped from height h, where h < R but gravity is not constant). Show that the speed with which it hits the ground, neglecting friction, is approximately given by: v = sqrt(2gh)(1 - (h/2r)) where g is the acceleration due to gravity on the surface of the Earth. HINT...
  19. L

    Newtons Laws with Uniform Circular motion

    Homework Statement An airplane is flying in a circle at a speed of 480km/h. It wings are tilted at 40 degrees to the horizontal. What is the radius of the circle in which the plane is flying? Assume that the required for is entirely provided by "aerodynamic life" that is perpendicular to the...
  20. G

    Derive Potential Energy from Newtons graviational law

    3. Beginning from Newton’s rule for the gravitational force = -GMm/r^2 derive an expression for the potential energy of a particle of mass m above the surface of the earth, and show that it can be written as: U(r) = -g0 RE/r where r is the distance from the centre of the earth, RE is the...
  21. A

    Project for Newtons Second Law of Rotational Motion

    Any help would be appreciated. I'm supposed to make a 20 slide project in power point to depict how angular acceleration, net torque, and moment of inertia are related to one another, as sated in Newton's Second Law of Rotational Motion. I'm supposed to describe the basic concept of the Law and...
  22. R

    Newtons second law/friction problem

    Homework Statement A 68 kg crate is dragged across a floor by pulling on a rope attached to the crate and inclined 15 degrees above the horizontal. (a) If the coefficient of static friction is .50, what minimum force magnitude is required from the rope to start the crate moving? (b) If...
  23. B

    Help with Newtons laws and friction

    Homework Statement a girl is skiing down a 35 degree inclined hill that is 120 meters long. She starts from rest and the snow has a coefficient of friction of .12. A. Draw an FBD B what is her acceleration c. How much time dows it take her to travel the 120 meters Homework Equations...
  24. F

    I meant pounds, not Newtons. Oops

    The attempt to convert the US to the metric system failed. We know the Mars polar lander had a historic failure as a result of failing to convert units. Has anyone out there had something go wrong resulting from communicating the wrong units?
  25. A

    Newtons Laws Question: Finding acceleration and direction of movement

    1. The only force on a 5.0 kg object has components Fx= 20N and Fy= 30N 2. Find the acceleration of the object and its direction of movement. 3. I think I'm supposed to somehow use Soh Cah Toa inorder to find something (I don't know what this would help me find). I need to use...
  26. D

    What force does the scale display in Newtons?

    Jasmine has a mass of 7 kg. He stands on a scale in an elevator that is accelerating downward at 4.9 m/sec ^2 . What force does the scale display in Newtons?Thank you for your help! :] F = ma i get 34.3 what is the unit i attach it to?
  27. B

    Trying to find volume given Newtons/ archimedes principle

    Homework Statement A paperweight, when weighed in air, has a weight of W = 6.6 N. When completely immersed in water, however, it has a weight of Win water = 4.0 N. Find the volume of the paperweight. Homework Equations Fb = Wfluid The Attempt at a Solution I can find density...
  28. F

    Newton's Cradle: Explaining 2-Ball vs. 1-Ball Dynamics

    when one ball is pulled out, released, and collides with the other four in Newton's Cradle, one ball will pop out the other side. Likewise, when two balls are pulled back, two balls will pop out the other side. Why doesn't one ball pop out, but with twice the speed? You are to use the concepts...
  29. H

    Can you explain the basics of Newton's law?

    Hello Maybe I am standing on a garden hose (great German adage, does it exist in english or are you confused what I am talking about?) Okay, to the topic: Just for one dimension. It is easier: We have m\ddot{x} = F(x(t)) Now my book tells me that if I expansion with the velocity I should...
  30. C

    Newtons method and distance help

    Homework Statement Given: Let d be the distance function of a point on a parabola y=9+3x-x^2 and point (5,11) Questions: a) express f(x) = d^2 in terms of x b) show that there is only one critical point of f c) approximate the critical point by Newton's method with the initial guess...
  31. A

    Newtons method to estimate solution to eq.

    Homework Statement Use Newton's method to estimate the requested solution of the equation. Start with given value of x0 and give x2 as the estimated solution. Homework Equations x0 = 2 ( this is the first guess numb. you start with) the equation you use is... x = x(guuess #) -...
  32. T

    Newton's Law Problems: Solve My 4 Problems

    here is my 4 problems. attached is my attempt at #2...any input would be great.
  33. T

    Master Newton's Laws with These Challenging Practice Problems

    I attached the problems here. I am really having a tough time getting these problems started. Any help to get me going in the right direction would be great.
  34. B

    Inertial Reference Frames and Newtons laws

    Homework Statement I am a bit confused about what are inertial reference frames and what is not. The text states: "We define an inertial reference frame as a reference frame in which Newton's laws are valid... Accelerating reference frames are not inertial reference frames...
  35. I

    Dynamics: Newtons laws of motion

    Homework Statement 73) A cyclist is coasting at a steady speed of 12m/s but enters a muddy stretch where the effective coefficient of friction is 0.60. Will the cyclist emerge from the muddy stretch without having to pedal if the mud lasts for 11 meters?. If so, what will be the speed upon...
  36. J

    Little Nellie Newtons Force Problems

    Hi, I have to do the Nellie Newton Problems on this Page here: Link! We just started with Forces and I tried to solve the problems but I´m not completely sure if my answers are correct. If there are mistakes it would be nice if you could tell me why and what I did wrong. Here are my...
  37. N

    Applications of Newtons Law Question 1

    Homework Statement A hockey puck of mass m is attached to a string that passes through a hole in the center of a table. The Hockey Puck moves in a circle or radius r. Tied to the other end of the string, and hanging vertically beneath the table is Mass M.. Assuming the table top is perfectly...
  38. I

    Solve Newtons Laws Problem: Find Acceleration & Force

    Dear all, I hope you could help me out a little. Homework Statement A person tries to raise a chain of 3 identical links; where each of the links has mass m. The chain is connected to a string is suspended vertically with the person holding the upper end of the string and pulling upward...
  39. M

    Newtons Laws-Force with respect to time

    Homework Statement An electron is oriented between two charged plates (oriented vertically). The electron experiences a constant force perpendicular to the plates. It has a mass of 9.0 x 10^-31 kg, is moving vertically with a velocity of 2.0 x 10^6m/s and enters the region between the two...
  40. S

    Exploring the Relationship Between Rockets and Newton's Third Law

    Why do rockets behave so well in accordance to Newtons third law
  41. D

    Rope, tension and Newtons third law

    This is more of a conceptual question, meant to help us understand how tension forces work. Homework Statement Assume that segment R exerts a force of magnitude T on segment L. What is the magnitude FRL of the force exerted on segment R by segment L? Give your answer in terms of T and other...
  42. J

    Newtons applied to a constant velocity

    Homework Statement A 1.0 kg object, moving with a constant velocity of 2.0 m/s, is acted upon by a force of 15 N in the direction of the motion for 6.0 s. What is the velocity (in meters/second) of the object at the end of this time? Homework Equations I was thinking of using, V = Vo...
  43. J

    Calculating Average Force: 0.110 kg Baseball Strikes Catcher's Mitt

    Have a difficult time on where to start here, iv'e looked over the book, and my notes, and I believe the question is more basic than given, Am I thinking too in depth here? Help please! A 0.110 kg baseball, traveling 34.0 m/s, strikes the catcher's mitt, which recoils 14.0 cm in...
  44. X

    Solving Newtons Cooling Law: LnT = -kt +LnC

    Newtons cooling law? Homework Statement uh for my lab report the problem is i have to solve for the constnat and the lnC? look below Homework Equations teacher said something about LnT =Lne^-kt +LnC transposes into ==> LnT = -kt +LnC uh and i have the temperatures to do this.. but i...
  45. W

    How Does a Climber Use Friction to Stay Stationary?

    Homework Statement A 75kg climber is supported in a "chimney" by the friction forces exerted on his shoes and back. The static coefficients of friction between his shoes and the wall, and between his back and the wall, are .8 and .6, respectively. what is the minimum normal force he must...
  46. S

    How do Newton's Laws relate to friction and inclined ramps?

    Homework Statement A 2.8 kg wood block is launched up a wooden ramp that is inclined at a 34° angle. The block’s initial speed is 8.56 m/s. What vertical height does the block reach above its starting point? What speed does it have when it slides back down to its starting point...
  47. G

    How Can I Apply Newton's Second Law with Friction in Real-Life Problems?

    ok, i need some serious help with Newtons second law. like i kind of understand it, but adding things like friction are giving me real problems. does anyone have any good resources or tips on how to understand/comprehend this? and i have a prolem: a man pushes a 15 kg lawnmower at constant...
  48. S

    Applying Newtons laws ( Equilibrium)

    Homework Statement A 26.21 kg loudspeaker is suspended 1.15 m below the ceiling by two 3.91-m-long cables that angle outward at equal angles. What is the tension in the cables? Homework Equations I have no idea The Attempt at a Solution well i know that i have the weight which is...
  49. G

    How Does Newton's Laws Apply to a Jet Stopping with a Parachute?

    [b]1. A 3600 jet touches down at 250 on the deck of an aircraft carrier and immediately deploys a parachute to slow itself down. If the plane comes to a stop in 180 , what is the average force of air on the parachute? Assume the parachute provides essentially all the stopping force...
  50. T

    Using Newtons notation V. Leibniz notation

    when is it better to use Newtons Notation nsted of Lebiniz notation?
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