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. R

    Understanding Newtons vs Joules - Beginner

    I'm trying to understand these basic concepts and I want to understand them deeply. In learning about Newtons and joules, I have a couple of questions. Please bare with me as I seek clarity. 1 netwon is the amount of force it takes to accelerate 1 KG at the rate of 1m/s^2. If a 1KG mass of...
  2. copypacer

    Bow and arrows, Newtons second law of physics

    Homework Statement If I have shot an arrow, would that arrow speed slow down due to air resistance? If so, would that mean that the the acceleration would be de-accelerating? Homework Equations f = ma The Attempt at a Solution This isn't a a homework problem, this is just something I was...
  3. SpacemanRich

    Newtons' Second Law with Kinetic Friction Problem

    Homework Statement While moving in, a new homeowner is pushing a box across the floor at a constant velocity. The coefficient of kinetic friction between the box and the floor is 0.41. The pushing force is directed downward and an angle θ below the horizontal. When θ is greater than a...
  4. I

    Newtons Third Law Involving three objects

    Homework Statement Three boxes, A, B, C, are positioned next to each other on a friction-less surface, an applied force acting on box A causes all the boxes to accelerate at 1.5 m/s/s. Calculate the force exerted by box C on box B. ma= 8 kg mb=10 kg mc= 5 kg Homework Equations Fnet=MA The...
  5. F

    Projectiles and Newtons law help?

    The first question is about Newton's Third Law: A boat is moving north at a velocity v=15 km/h a man on the boat throws a ball horizontally with a velocity u=15 km/h how is the motion of the ball w.r.t the man? For this, I thought that because the boat is moving with the same speed as the...
  6. D

    Violation of Newtons third Law and conservation of momentum

    Three High energy Photons spontaneously convert into electron positron pairs, The electron on the left marked A is created and and destroyed within a short interval, sending an electric field burst towards electron B shortly after it's created, just enough so that Electrons B's electric field...
  7. C

    Calculate pressure from vehicle moving through air

    Alright, I've been looking everywhere, and tried to use a few formulas but they don't answer what I'm trying to find. Let's say I have a car that weighs 1815kg )4000 pounds) and its traveling at 90kph (roughly 56 mph) with a flat one square meter (10.76 sq ft.) grill facing the wind as it...
  8. shott92

    What is the relationship between impulse and momentum in physics?

    so basically i have calulated some forces in Newtons at one second intervals i have time - 1, 2, 3, 4, 5, ----- 5 seconds total distance - 3, 12, 27, 48, 72 ------ 162 meters total force = 1804, 1822, 1849, 1866, and 101 Newtons energy= 5411, 16'369, 27'736...
  9. H

    A=F/M Based problem - air track glider

    At time t=0 s a 0.362-kg air track glider is moving rightward at 5.1 m/s. At t=2.5 s, it's going leftward at 5.4 m/s. Determine the magnitude and direction of the constant force that acted on the glider during this interval. Give your answer in Newtons. If the force is going rightward, your...
  10. T

    How do you get Newtons Squared?

    If you multiply a force by a force, do you get a force squared? What is a square force? An engineering statics textbook I'm reviewing says N x N = N^2.
  11. M

    Understanding Newton's Third Law: The Cause of Balloon Movement

    If you fill a balloon with air and let it go, since the initial momentum was 0 and the air in the balloon is pushed in one direction, the balloon must move in the other direction. What is the cause of the force that causes the balloon to move this way?
  12. 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...
  13. U

    Why Does the Bar Exert More Force Than the Gymnast's Weight?

    Homework Statement I am trying to understand a diagram I have of a gymnast hanging from a bar. She weighs 50kg and is not swinging, just hanging. In the diagram it has her weight as 500N (using 10/m/s/s for gravity * 50kg) but the bar she is hanging from has an upward arrow with 550 N next to...
  14. R

    Calculating Normal Force for Blacksmith's Anvil - Newton's Third Law

    Homework Statement [/B]Find the normal force exerted on a 68.2 kg blacksmith's anvil by the level block of wood that is supporting it.Homework Equations [/B]f=ma Ff=uFnThe Attempt at a Solution [/B]I have tried to find all the forces acting on the anvil while using its mass but I am not...
  15. N

    Free body diagram and applying Newtons law

    hello! this is a question that iv been working on and can't seem to figure it out, i checked out the other two threads on this same question but they were of no help, anyway here it is: A wedge with mass M rests on a frictionless horizontal table top. A block with mass m is placed on the wedge...
  16. S

    How Can Thrust Be Expressed in Newtons for an Engine Rated at 160 HP?

    Given that an engine's rated power is 160 HP (~119kW), how can I express thrust (T) in Newtons, if aerodynamic drag (D) requires weight expressed in Newtons as well to ensure consistency when calculating power available (Pa) and power required (Pr)?: D = (\frac{1}{2}\rho...
  17. T

    Calculating Tension and Friction in Newton's Second Law Problems

    Homework Statement Homework EquationsThe Attempt at a Solution I'm not sure if their are frictional forces on the cart and the mass m. Also do I have to somehow get the length of the bar involved ?, not sure how to do that. Also is their a tension acting on the bar ?
  18. K

    Conceptual questions on Newtons third law

    Hello! I'm a high school teacher in physics. I will teach Newtons third law this coming week and found the following question (regarding a horse pulling a carriage): "If the force on the carriage is equal and opposite to the force on the horse how can the horse pull the carriage? Is the...
  19. M

    Classical Mech - Newtons 2nd. Quad Air Resistance

    Homework Statement A puck of mass m is kicked up an incline (angle θ) with initial speed vo. Friction is not present, but air resistance has a magnitude of f(v) = cv2. Solve Newtons second law for the pucks velocity as a function of t on the upward journey. How long does the journey last...
  20. BrainMan

    What Is the Gravitational Force Between Two Rocks in Space?

    Homework Statement Two identical rocks of mass 2 kg drift through space far from any planet or star. If they pass one another at a separation of 30 cm, what is the magnitude of the gravitational force of one rock on the other at this instant. Homework Equations F = G (m1m2/r2)...
  21. S

    Newtons third law and quantum mechanics

    dear sir, we know that third law of motion says that every action has a equal and opposite reaction. quantum mechanics tells us that it is possible not predict the position as well as the speed of electron. i like to know if electrons ,protons and neutrons form a system called atom...
  22. S

    I've been staring at this Newtons first law assignment for hours

    And I'm starting to feel kind of dumb here... here is the picture to go along with the question Question: Draw a free-body diagram for Point A, showing all the forces acting at A. Resolve the vectors into components, where necessary. Using the first condition of equilibrium, solve...
  23. B

    Newtons cradle, conservation of momentum

    Homework Statement I don't understand how momentum is conserved in Newtons cradle. If I look at the component vectors for the initial ball on the left that I raise, one component points down and one points to the right but then looking at the vector components on the ball that moves on the...
  24. B

    Convert N/m^2 to Newtons, beam problem

    Homework Statement I want to convert 110.0 x 10^6 N/m^2 to Newtons. How do I do this? Reason: I have the following problem and the following question to answer: P: A heavy mass is supported by a beam-cable system as shown in the figure. The beam is 5.000 m long with a mass of 36.00 kg. The...
  25. S

    Physics Newbie - Newtons 1st Law - Frames of References & Observers

    Hi All Let me start by saying that I am new to this forum and I am new to physics. I've always had an interest in getting an entry level understanding of Newton's Laws of Motion. I also apologize if these questions are a bit stupid or overly covered in other posts. I watched a Yale video...
  26. P

    Does anyone know any childern's books about Newtons Laws or Catapults?

    Hey everyone, Random question. Does anyone know any good childern's books about Newton's laws or catapults? I was thinking about getting a gift for my cousin who is turning 10 soon. He really likes catapults so I was thinking about getting him an educational book about catapults...
  27. Q

    Newtons laws of universal gravitation

    Homework Statement its 3.8 x 10^8 from Earth's core to the lunar's core calculate the gravitational attraction exerted by Earth on the moon Homework Equations ag = GM/ r^2 G= 6.67 x 10^-11 M of earth= 5.98 x 10^24 ... r= 6.37 x 10^6 M of moon= 7.36 x 10^22 ... r= 1.74 X...
  28. C

    Newtons law and canoe question

    If you can get to your feet in a canoe and move towards the front of the canoe, it will move in the opposite direction. Explain why. I thought Newton's first law applies to this question (after the person steps on the canoe, the canoe still maintain at rest), but i am not sure how to explain it.
  29. KiNGGeexD

    What is the role of friction in Newton's Laws?

    Hi I am stuck with a question which I have attached a photo of, it is one involving friction! I have done a few of these questions already and find it is when I am defining forces etc it's where I go wrong, not the easy computational part:( I also have attached my attempt at the solution and...
  30. V

    3 Cars Meets Newtons Second Law

    This is not a homework problem - I am trying to understand the physics of something that happened to me. Scenario: two cars are stopped at a red light. Car #1 in front, and behind it is car #2. Car #3 comes up from behind, does not stop, and hits car 2, and car 2 in turn hits car 1. I am...
  31. S

    Newtons 2nd Law - Acceleration Problem

    Homework Statement Starting from a rest position, how long will it take a 50 kg cyclist riding a 10 kg bike to reach a speed of 4 m/s if the resultant force acting on the bicycle is 48 N? Homework Equations F=ma Vf=Vi + at The Attempt at a Solution F=ma (F-48)=(50+10)(a)...
  32. N

    Is Newtons calculus approximate?

    Hello PF :smile: i was studying rotational motion it is given in my textbook that the moment of inertia of a rod of mass M and length L about an axis passing through the center of rod and perpendicular to the rod is ML2/12 This formula was prepared using calculus. So i experimented... a...
  33. R

    Can You Solve This Newton's Law of Motion Problem?

    To Admin - This is not my homework, My teacher solved it but I am trying to solve this problem using other methods. If I posted this in wrong group, please message me and I will Post this in correct corner. Problem - To find acceleration in both blocks sliding on smooth surface,string and...
  34. J

    Using Newtons law and mechanical energy?

    1. Homework Statement [/b] A car is rolling down a ramp that is inclined at and angle of 9.9 degree with respect to horizontal. There is no friction acting from the road on the tires. Employ conservation of mechanical energy to find the speed of a car that starts from rest and rolls down...
  35. M

    Newtons Laws, Finding tension in the tow cable and foce

    Homework Statement Just started tension problems and having some trouble figuring out how to approach the problem. Thanks for any help in advance. Consider a rocket that is taking off and towing a large container of trash. The rocket’s engines exert a force, F, that causes the rocket and...
  36. A

    Why Does the Rope Snap When Bob Accelerates His Truck?

    Homework Statement Sorry if i sound stupid, i just can't understand this problem. Bob wants to tow a car with his truck. He loosely attaches a rope between the vehicles. Bob accelerates rapidly with his truck, forcing the rope to snap. Explain the scenario using Newton's First Law...
  37. J

    How can I better understand Newton's laws with examples and explanations?

    I am having a very hard time understanding these two problems I have attached. I have read the chapter in our text over and over again, but do not see the correlation or how to exactly set the problems up. I recently had surgery on my writing hand and missed a large portion of this class, so I...
  38. SSGD

    Newtons 2nd Law corrected for Relativity

    F = d(mv)/dt Newtons 2nd Law F = -kx Spring Force F = -cv Damping Force d(mv)/dt = -kx + -cv How would you correct the equation for a damped harmonic oscillator for relativity. If it is possible. I just want a one dimensional solution unless you have to go...
  39. B

    What is the minimum tension (in Newtons) in the angled rope?

    Homework Statement A hanging 2.00-kg (19.6N) block begins to accelerate a 4.28-kg (41.94N) block on a horizontal surface. But a rope connected to the wall at 26.9 degrees brings the block to an equilibrium position. The coefficient of friction between the surface and the 4.28-kg (41.94N) block...
  40. N

    How Do Friction and Normal Force Act on a Rod at an Angle?

    Homework Statement Here is a rod of mass m(as shown in figure)which is released from rest.The angle made by the rod with the ground is 600. Assume that the force of friction is enough to prevent sliding of the rod.Find the normal reaction and the frictional force just after the rod is...
  41. M

    Where did Newtons Second law come from?

    I want to preface this question with the fact that I am a scum noob. How did Newton come up with the second law of motion. As I understand it, it is only derived through experiential observations. I have tried many different Google searches but I can't find anything relevant.
  42. W

    Fluid Mechanics Newtons law of viscosity

    Homework Statement having problems differentiating Homework Equations Tw ( wall shear stress)= -U(viscosity)*du/dr been given u as 2V(1-(r/r)^2) The Attempt at a Solution i substituted u in and got d/dr (2V(1-(r/r)^2) i tried to multiply out the minus sign and 2V and got...
  43. A

    Newtons cradle Conservation of Momentum

    ignore
  44. R

    Newtons Cooling problem/ possible error in book.

    I have a book called REA 's problem solvers: Differential Equations Year 2004 and the problem 12-14 on page 244 might have problems with it and I want to ask to see if anyone else thinks so. The problem is basically Newton's cooling where they ask to find T - T_o = (T_i - T_o) e^(-kt)...
  45. K

    Newtons 3rd law - how can this rope move?

    Hi I'm having trouble understanding this situation. Appologies if I posted in the wrong place, this is pretty simple but it's not really a homework question. A horse is attached to a large stone by means of a rope (modelled as light and inextensible). Let the mass of the horse be m and the...
  46. N

    Newtons law Dynamics Question 4

    Homework Statement Determine the acceleration of a 10kg block traveling up a ramp connected by a massless string and massless pulley to another block that is 5kg and in free-fall. if the coefficient of kinetic friction between the block and the ramp is 0.2 (The diagram shows one block...
  47. N

    Newtons laws, dynamics questions

    Homework Statement 1) A 1000-kg Car is parked on a 10 degree slope. Determine the magnitude of the frictional force acting on the car 2) A 2000-kg car traveling at an initial speed of 10m/s skids to a stop with a constant acceleration. The coefficient of friction between the tired and the...
  48. N

    Newtons third law question- Action reaction pair

    Homework Statement A 2000kg car pushes a 1000kg garbage can at constant speed . The car exerts a force of magnitude CB on the garbage can, and the garbage can exerts a force BC on the car. Which force has greater magnitude, or are they equal? explain Homework Equations Fcb=-Fbc The...
  49. A

    Newtons 2nd law for non-rigid bodies

    I have a question pertaining to the motion of the center of mass (CM) of several connected bodies. Homework Statement Here is a picture of the set-up (green surfaces are stationary): The mass of the spring is zero. The mass of the disk is M1. The mass of the bar is M2. There is a pin...
  50. V

    How Do Newton's Third Law and Force Calculations Apply to Hockey Players on Ice?

    Homework Statement two hockey players are standing on ice. Player A is 100kg and player B is 112kg, Player A pushes B with 40N and player B pushes A with 50N. what are the action/reaction forces? what are the accelerations?Homework Equations F = maThe Attempt at a Solution player A has a...
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