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. S

    What is the weight of a giant squid in Newtons?

    The heaviest invertebrate is the giant squid, which can have a weight of about 1.5 (imperial) tons spread out over its length of 64 feet. What is its weight in Newtons? I tried converting the tons to kilograms and multiplying by 9.8 but didn't get the right answer. Where should the 64 feet...
  2. J

    Is Acceleration Equal to Net Force Divided by Mass in Newton's Second Law?

    Is acceleration involving N just N/kg? so If I have a ball that is 7kg and 5 N of force is applied will the acceleration be 5 / 7 = 0.71 m/s/s ?
  3. P

    Solve Mass of Dog Food Given Force, Acceleration, Time

    At the local grocery store, you push a 15.2 kg shopping cart. You stop for a moment to add a bag of dog food to your cart. With a force of 12.0 N, you accelerate the cart from rest through a distance of 2.24 m in 3.00 s. What was the mass of the dog food? F=ma m=f/a I rearranged...
  4. E

    Measuring wind speed with ball and string Newtons 2nd law

    hello everyone, Im new to this forum but i really need some help doing a physics assignment. I am trying to use Newtons second law and the equation for wind resistance(click link) to determine the the angle made by a specific velocity. The link to the assignment is...
  5. K

    Kilogram Newtons (Extremely Easy Question)

    Very sorry, but I just don't know.. If there is a 5kg load on an object, let's say a book on a table.. what is it's force in kgN? Is it 5kg x 9.8?!
  6. B

    Find the force (in Newtons) exerted on the dam

    The Deligne Dam on the Cayley River is built so that the wall facing the water is shaped like the region above the curve y=0.1x^2 and below the line y=180 . (Here, distances are measured in meters.) The water level can be assumed to be at the top of the dam. Find the force (in Newtons) exerted...
  7. X

    Newtons 3rd law+Horse Cart System+Action/Reactonhelp needed

    Newtons 3rd law+Horse Cart System+Action/Reacton..help needed ASAP! im a sophmore in the ib program and I'm in conceptual physics i have a test tommorow on Newtons third law and all the stuff that goes along with it.. so i need an answer on this pronto! first of all.. if you are standing...
  8. Pengwuino

    Mathematica Newtons cooling law DE, mathematical approach

    I have this one problem dealing with Newton's law of cooling: \frac{{dT}}{{dt}} = - k(T - A) I'm basically trying to determine at what time someone died! The info I have is that at time of death, the temperature was 98.6 degrees, at 10 AM it was at 92 degrees, and at 2PM it was at 86 degrees...
  9. L

    Newton's Third Law: Two Blocks Situation 1 & 2

    Two blocks standing on oneanother are pulled with a force F. There's friction between them. With a certain force F the purple block is standing still on the green one (situation 1) because of static friction. Is the netto force working on the green block F+ static friction of the purple block...
  10. I

    Newton's 2nd Law: Car Dragging Trailer Analysis

    A car drags a trailer like the illustration below shows. http://home.no/elgskogskole/mycar.JPG a)The speed is so low that the friction has nothing to do with the movement of the car. i)What is the acceleration when the tires are dragging the car with the power of 1700 N. ii)What is the...
  11. P

    What Range of Values of m2 Will the Blocks Remain at Rest?

    Ok the question is Mass m1 is on an inclined surface at angle @ and is connected to a second hanging block with mass m2 by a cord passing over a small, frictionless pulley. the oeficient of static friction is u and the coefficient of kinetic friction is uk. I first had to find m2 when m1 is...
  12. L

    Newtons second law and stopping on a dime

    An advertisement claims that a particular automobile can "stop on a dime." What net force would actually be necessary to stop an automobile of mass (m) traveling initially at a speed of (v) in a distance equal to the diameter of a dime, which is (d) ?
  13. L

    Conceptual Newtons laws of motion question- mass and weight

    You have just landed on Planet X. You take out a ball of mass , release it from rest from a height of and measure that it takes a time of to reach the ground. You can ignore any force on the ball from the atmosphere of the planet. How much does the ball weigh on the surface of Planet X?
  14. I

    Please I need some help in Newtons Laws

    In the example i have A block (mass m1 = 22.1 kg) is on a surface inclined at = 33°. It is connected to a mass m2 = 11.2 kg by a massless cord passing over a pulley. The coefficients of friction are µk = 0.15 and µs = 0.25 It asks me for the magnitud of the friction. After looking at this...
  15. N

    How Can I Calculate the Kinetic Friction Between Plastic and Cardboard?

    Working out some simple physics and I can't figure out how to convert velocity to Newtons for force.. A six pound (2.72kg) tonka truck is moving across a cardboard bridge at a constant velocity of .067m/s (estimated). I tried looking for a while but was unable to find the kinetic friction of...
  16. P

    How Do You Calculate the Coefficient of Kinetic Friction for a Sled?

    Can some one help explain? A 20.0kg sled is being pulled across a horizontal surface at a CONSTANT VELOCITY. The pulling force has a magnitude of 80.0 Newtons(N) and is directed at an angle of 30 degreesabove the horizontal. What is the coefficient of kinetic friction?
  17. I

    Solving for Min Speed with Applied Newton's Law

    I can't figure out how to solve for the minimal speed needed if they only provide me a radius. I am using this formula: \sqrt{\frac{F*r} {m} } I simplified to: \sqrt{g*\mu*r} ,but i don't have no idea how to solve for /mu . Please some help.
  18. I

    Minimum Kinetic Friction for Inclined Block System

    I have a block conected to another block by a string in an inclined surface, with a frictionless pulley. Both blocks are the same weight so i already figure the acceleration of the object that its being pulled up. What I don't know is how can I calculate the minimum kinetic friction that will...
  19. I

    Newtons Law Involving Friction

    I have a block conected to another block by a string in an inclined surface, with a frictionless pulley. Both blocks are the same weight so i already figure the acceleration of the object that its being pulled up. What I don't know is how can I calculate the minimum kinetic friction that will...
  20. A

    Differential Equation and Newtons 2. law

    In a fluid, there's an exponential force F = -b*e^v working against the direction of movement. B is constant, and v is the objects velocity in m/s. They want me to use Newtons 2. law to find a differential equation for the movement of an object with mass m. The equation is separable...
  21. E

    What is the Magnitude of the Acceleration in This Newton's Laws Problem?

    Problem: Three forces in an xy plane act on 3.10 kg mass. 16.90 N directed at 46 deg, 7.20 N directed at 119 deg and 9.20 N directed at 218 deg . (all angles are measured from the positive x-axis, with positive angles in the counter-clockwise direction.) Calculate the magnitude of the...
  22. S

    Gravity problems - when is the Earth's attraction 5 Newtons

    I just recently started studying physics about a month ago, so I'm not too good at it yet. Anyway, here's the problem: When a certain object is 100 meters above the surface of the Earth, Earth's attraction for it is 10 Newtons. In order for Earth's attraction for the same object to be only 5...
  23. C

    Newton's Second Law: Momentum & Proportionality

    I've a fairly good maths background, but I'm trying to improve my mechanics. Anyway, I read a version of Newton's second law as follows (I've not got it to hand so this may not be exactly right) The change in momentum per unit time is proportional to the resultant force in that direction...
  24. J

    Limitations of Newton's Laws: Exploring Momentum Changes Without Force

    iam really searching for the answer where does Newtons laws fail.i came to know that in some cases without the application of force there may be change in the momentum of the particle.how can this happen .can anyone quote the example. what is a virtual work and how could it be possible...
  25. A

    Conversion between lbf and Newtons

    I know there are 4.48 N in 1 pound force. The only way I can derive this is dividing 9.8 m/s^2 by 2.2 lbm/kg. The result shows that there 4.48 N in 1 lbm, but shouldn't it be that there are 4.48 N in 1 lbf. Can anyone clear this up or show a better derivation? Thanks
  26. B

    Here i am again Newtons second law

    Consider another special case in which the inclined plane is vertical (\theta=\pi/2). In this case, for what value of m_1 would the acceleration of the two blocks be equal to zero? Express your answer in terms of some or all of the variables m_2 and g. a good point in the direction will help
  27. E

    Using Newtons 2nd law in an elevator

    if a guy is in an elevator (55 kg for the person), and then he jumps straight uo- the scale will read 622 N. what is the acceleration of the guy at this instant? how do you deal with this b/c i don't know how to do it unless he is still standing on the scale. i know there should be an...
  28. S

    How would one label power? Is it in Newtons?

    How would one label power? Is it in Newtons? And also, if a car is balanced on a hill, what are two of the forces that are acting upon it. I have gravity of course, but does inertia also work? Thanks in advance!
  29. I

    Newtons Laws of gravitation, Keplers law, & Orbital Motion?

    Can anyone give me a clear and good explanation of Newtons Law of Gravitation, Keplers Law & Orbital Motion.
  30. K

    Connection between Acceleration and Mass: An Analysis

    What mathematical relationship exists between acceleration and unbalanced force (direct, inverse) What mathematical relationship exists between acceleration and mass Just need help solidying my answers, any help will be appreciated
  31. D

    What is your weight? (in Newtons)

    Suppose that when you ride on your 7.00 kg bike the weight of you and the bike is supported equally by the two tires. If the gauge pressure in the tires is 73.5 lb/in2 and the area of contact between each tire and the road is 7.13 cm2, what is your weight? (in Newtons) MY WORK...
  32. R

    Newtons Gravitational constant?

    WHY was this thread closed? it's a perfectly legit topic and question. many people have offered an explanation for why G is what it is. it is what it is because of the units of time, length, and mass we humans have anthropocentrically decided to use. it is a fundamental quantity and if...
  33. F

    What is the tension in rope 2 if a sled dog pulls 2 sleds with different masses?

    Hi I need help on these questions, please try to be specific. A sled dog pulls 2 sleds, A and B mu=0.10 If tension in rope 1 is 150 N What is the tension in rope 2? ----------------------------------- Mass 1 on a table (mu=0) is connected by string through a hole in the table to a...
  34. O

    Physics Newtons 3rd/2nd law problem

    The coefficient of kinetic friction between the 2.0 kg block in figure and the table is 0.280. I can't get a picture up here, but i will make the picture easy for you to imagine. there is a table with a pulley on 2 corners. one 2kg weight is on the middle, there is a 3kg weight hanging...
  35. A

    Exploring Newton's Cradle Velocity: Impact of Ball Height and Energy Transfer

    if you have a Newton's cradle consisting of, say, 5 balls, and you displace 2 of these to the left and let them go, we say they hit the others with velocity v. I was just wondering if the balls would have different velocities at the point of impact since they will have inevitably fallen from...
  36. I

    Help with Friction and Newtons laws

    I have this physics problem that has simply been driving me crazy...heres the problem: Jenn coasts down the hill on a sled, reaching the bottom with a speed of 7.0m/s. The coefficient of kinetic friction between the sled's runners and the snow is .05, Jenn has a mass of 62 kg, and the sled has...
  37. N

    Newton's Laws Question: Airplane Loop Speed & Apparent Weight Calculation

    Having trouble with a homework problem on Newtons Laws, would appreciate any help: An airplane flies in a loop (a circular path in a vertical plane) of radius 150m. The pilot's head always points toward the center of the loop. The speed of the airplane is not constant; the airplane goes...
  38. F

    Electrostatic force, Newtons and Distance

    Have a problem that I'm not sure how to approach any help would be appreciated! If the electrostatic force between two protons is equal to 1x10^-7 Newtons, what is the distance between them?
  39. M

    Converting Slugs to Newtons: A Quick Guide for Solving Physics Problems

    I am working a Physics problem where the mass is given as 20 slugs. To obtain Newtons can I just multiply 20 slugs x (14.59 kg/1 slug) x 9.80 m/s^2 = 2859.64N?
  40. S

    Problem dealing with Newtons First Law

    A 75 kg water skier is being pulled by a horizontal force of 620 N and has an acceleration of 2.1 m/s2. Assuming that the total resistive force exerted on the skier by the water and the wind is constant, what force is needed to pull the skier at a constant velocity? ? N
  41. W

    What force, in Newtons, does the wood exert on the bullet?

    A .22 rifle bullet, traveling at 350 m/s, strikes a block of soft wood, which it penetrates to a depth of 0.130 m. The block of wood is clamped in place and doesn't move. The mass of the bullet is 1.80 g. Assume a constant retarding force. 1.) What force, in Newtons, does the wood exert on...
  42. R

    What Are the Correct SI Units for the Gravitational Constant G?

    I'm stuck on the following question: Newton's law of universal gravitation is represented by the following equation. F = GMm/r2 Here F is the magnitude of the gravitational force exerted by one small object on another, M and m are the masses of the objects, and r is a distance. Force has...
  43. A

    Help with Newton's Problem | Get Assistance Here

    can anyone help me in this problem ? see the attachment please
  44. O

    Newtons Third Law: Cause/Effect or Simultaneous?

    When object A and object B collide, where A is moving and B is stationary and where B seems to compress: Does B expand in response because a pre-existing internal force exists in B and exerts an equal and opposite reaction, or Is the entity motion transferred from A to B redirected back...
  45. A

    How Do Newtons Relate to Watt-hours in Energy Conversion?

    Hi, I'm working on a mythical gadget for an sf novel that converts electrical power into acceleration. I'm having a hard time figuring out this relationship from my science references. I suspect I've forgot some calculus that might be required. I'd like to figure out the real...
  46. N

    Need help with a question on Newtons Law's of Motion.

    An elevator is moving upward with an acceleration of 1.0 m/s2. The total mass of the elevator and the passengers is 800kg. I need to find the tension in the elevator cable assuming g=32ft/s2. Need help, beginner in physics. Thanks!
  47. A

    Is the Force Acting on this Rocket Balanced or Unbalanced?

    Could anyone please help me with the following question? A rocket rises steadily upwards at a constant speed of 500 metres per second. Its initial mass is 5 x 10^4 kg; after 10 mins, this has decreased to 4.4 x 10^4 kg. Calculate the average force acting on the rocket during this time. This...
  48. E

    Newtons does a 40 kg bag of stones weigh

    how much in Newtons does a 40 kg bag of stones weigh? my answer is 302 Newtons is that correct?
  49. P

    Newtons second law force problem

    A 69 kg block is pushed along the celing with a constant applied force of 1300N that acts at an angle of 56 degrees with the horzontal. The block accelerates to the right at 8m/s^2. What is the magnitude of the normal force the ceiling exerts on the block? Answer in units of N. and A...
  50. K

    What are some examples of Newton's 1st Law in action?

    Can anyone out there give me some examples of Newtons 1st law? ~Kathleen
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