What is Banked curve: Definition and 109 Discussions

A banked turn (or banking turn) is a turn or change of direction in which the vehicle banks or inclines, usually towards the inside of the turn. For a road or railroad this is usually due to the roadbed having a transverse down-slope towards the inside of the curve. The bank angle is the angle at which the vehicle is inclined about its longitudinal axis with respect to the horizontal.

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  1. A

    I Confused about N*sin(theta) = (m*v^2)/r in banked curve

    If there is a car resting on a banked curve with angle theta, velocity v = 0, but N (normal)*sin(theta) > 0. So N*sin(theta) =/= (m*v^2)/r with v = 0. But my physics textbook just defined N*sin(theta) = (m*v^2)/r in banked curve. What is going on here?
  2. D

    Solving Banked Curve Problem: Max Velocity

    Here's a FBD I made for this question. From the diagram, I obtained that ##-W + N \cos\theta - f_s \sin\theta = 0##. And ##N\sin\theta + f_s \cos\theta = ma = \frac{mv^2}{R} \leq N\sin\theta + f_s^{\max} \cos\theta = \frac{mv_{\max}^2}{ R}##. Solving these equations, and using the angle...
  3. RoboRaptor

    A Car on a Banked Curve Moving in Uniform Circular Motion

    First I figured out the normal force being exerted on the car using the equation above. Cos(40°)*(1050*9.8) = 7883N Next, I tried to find out the horizontal component of the normal force by doing: Cos(50) * 7883 = 5067N I figured out the angle by using certain geometrical properties. Next, I...
  4. brsclownC

    What is the magnitude of resultant force on a car on a banked curve?

    Ok so I think that the equation for centripetal force is the mv^2/r and this SHOULD equal the horizontal component of the normal force on the car. Vertical component of normal force and gravity would cancel out. However, when I input the numbers into the equations I don't get equivalent values...
  5. Y

    What is the Needed Coefficient of Static Friction for a Car on a Banked Curve?

    Homework Statement If a curve with a tedious of 80m is perfectly banked for a car traveling 70km/h, what must be the coefficient of static friction for a car not to skid when traveling at 90 km/h ? Homework Equations Newton’s second law F=ma The Attempt at a Solution To find the angle of the...
  6. Motzu2098

    Find the Coefficient of friction on a banked curve.

    Homework Statement A car giving a turn on a curve with 88m of radius, traveling at a speed of 95km/h, the curve is perfectly banked for a car traveling at 75 km/h, meaning that the curve has an angle θ of 26.7º. Homework Equations μ = ? r = 88m v = 26.38 m/s θ = 26.7º Ff = μ · g · m Fc = m...
  7. A

    B What is the Net Force on a Banked Curve?

    I understand why when deriving the formulas for cars on banked curves, the net force in the Y direction is zero. However, when I google how to derive them, people say that there is a net force greater than zero in the X direction. This is not what my professor says in his explanations however...
  8. starstruck_

    Car on Banked Curve: Centripetal Force?

    Does a car on a banked curve have a component of gravity that accounts for the centripetal force ( along with the normal force)?
  9. Alexanddros81

    Banked Curve-Determine smallest static coefficient of friction

    Homework Statement 13.49 The flatbed railway car travels at the constant speed of 80 km/h around a curve of radius 55m and the bank angle 15deg. Determine the smallest static coefficient of friction between the crate and the car that would prevent the crate of mass M from sliding. Homework...
  10. M

    B Understanding the Horizontal Component of Normal Force in Banked Curves

    Why during a banked curve is the horizontal component of the normal force considered as the net force and the centripetal force? The horizontal component of Normal force, N·sinθ, is not even ponting towards the centre of the curvature.
  11. B

    Max Speed of Car on Wet Ramp Turn at 20° Bank

    Homework Statement A car is making a turn on a wet highway ramp. The coefficient of static friction between the tires and the road is 0.25. Determine the maximum speed at which the car can safely negotiate a turn of radius 200m with a banking angle of 20 degrees. radius= 200m μs=0.25...
  12. F

    Which force is the centripetal one in a banked curve?

    Hello Forum, In the situation of a car banking a curve there are two forces: weight W and the normal force N. Theta is the banking angle between the road and the horizontal. The vector addition between W and N gives a net force F_net that is directed toward the center. That F_net is the...
  13. D

    Banked Curve - Minimum Turn Radius

    Homework Statement A car traveling 10 m/s is moving along a track banked at 5 degrees. The tire-road friction coefficient is .3 What is the minimum radius it can travel without slipping? v0= 10 m/s Bank Angle Θ = 5° μ=0.3 Note I am working through prep material for the exam. The solution...
  14. L

    Engineering Calculating angle of lean on a motorbike on a banked curve

    Hi all, I was wondering if anyone could help me with calculating the angle of lean on a motorbike on a banked curve (with friction). If possible proofs would be very useful. Thanks Lee
  15. oreo

    Solve Banked Curve Problem: tan θ = ν^2/rg

    A problem states " For a banked curve, ignoring friction, prove that tan θ = ν^2/rg". I tried to prove but I thought that as the normal force is at right angle to track then how could be the component of normal force provide the centripetal force as my book is saying. Please someone help. I...
  16. S

    Circular motion banked curve questions

    Relative equations: F = ma a = v^2/r Fcent = mv^2/r ωf^2 – ωi^2 = 2αs s = θr ω = v/r Problem statement and work so far are all included: (I am having trouble with 5 and no clue how to start on 7-9) You are designing a roadway for a local business, to include a circular exit ramp from the...
  17. F

    Help with Banked turns - Physics

    So I'm having a hard time understanding baked turns involving roads. Mainly I'm confused on how to derive the friction force into the x and y components and why it turns be like so. I also am confused about when i encounter a problem that involves friction in banked turns like in the picture...
  18. J

    Trying to derive the equation for an ideally banked curve

    I'm confused trying to understand the previous steps that lead to the formula for the angle of an ideally banked curve. In absence of friction, this is the angle where the Centripetal Force is provided by the horizontal component of the Normal Force. I understand that the Normal Force is...
  19. S

    What is the Radius of Curvature for a Banked Curve with Ice on the Road?

    Homework Statement A civil engineer is asked to design a curved section of roadway that meets the following conditions: With ice on the road, when the coefficient of static friction between the road and rubber is 0.12, a car at rest must not slide into the ditch and a car traveling less than 70...
  20. J

    Solving Banked Curve Problem: Coefficient of Static Friction

    Homework Statement A town wants to build a banked curve to join to large roads. The maximum speed they would like cars travel on this curve is 51m/s. The angle of the banked curve is to be 19o and the radius is to be 1.8x102 m. a) What does the coefficient of static friction need to be...
  21. P

    Banked Curve and skidding

    Homework Statement A curve with a 140m radius on a level road is banked at the correct angle for a speed of 20 m/s. If an automobile rounds this curve at 30 m/s, what is the minimum coefficient of static friction between tires and road needed to prevent skidding? Homework Equations F_fr =...
  22. I

    Circular Motion - Banked Curve

    Homework Statement Designing an on ramp for the 401 the engineer wants cars to be able to make the turn with a radius of 50 m while traveling 40km/hr in conditions with no friction. What angle must he bank the curve at to make this possible? Homework Equations FR = (m)(aR) FR = (m)(v2)/(r)The...
  23. P

    Banked curve with friction, but no angle

    Homework Statement A banked curve has been designed so that it is safest for a vehicle going 70 mph. The topography of the land restricts the radius of the road to 300m. Assume mu(static friction) is 0.80 and mu(kinetic friction) is 0.60. A 5512 lb vehicle travels with a speed of 60 mph on...
  24. P

    Banked Curve Impossible Problem

    Homework Statement A curve of radius 67 m is banked for a design speed of 95 km/h. If the coefficient of static friction is 0.30 (wet pavement), at what range of speeds can a car safely handle the curve? Homework Equations I drew this freebody diagram. The Attempt at a...
  25. J

    Normal force on a car rounding a banked curve

    This is my first thread on the forum. I'm really glad to have found this wonderful resource. I have a lot of intuition in mathematics and one of my dreams has been to have the same level of intuition in physics. With your help I hope I can achieve that. I was reading an example in Physics...
  26. S

    Rollecoaster Banked Curve Physics

    Hey all, I'm in the process of writing a report concerning the physics of rollercoasters going around banked curves. With the rollercoaster I'm focussing on, the velocity of the car is always greater than the designed velocity of curves meaning there is a friction force parallel to the bank...
  27. Y

    How Does Normal Force Change as a Car Accelerates on a Banked Curve?

    hello good morning. Let look at the two diagram. (back view) In STATIC, a car is remauning static at a bank curve and its force diagram is as follows. for this case, the normal force is smaller than the weight of the car and friction exists in the directiin perpendicular to car. In MOTION...
  28. totallyclone

    Finding the range of speed on a banked curve without slipping

    Homework Statement A curve of radius 60 m is banked for a design speed of 100km/h. If the coefficient of static friction is 0.30, at what range of speeds can a car safely make the turn. Homework Equations Fun=ma Ff=μsFn Fc=mV2/r The Attempt at a Solution So, when it is...
  29. R

    Circular motion on a banked curve

    how can rcosθ in a banked road be equal to mg; since r is equal to normal reaction which is equal to mgcosθ. rcos is even smaller than r. so mg>mgcosθ mgcosθ=r r>rcosθ so mg>rcosθ then how can mg=rcos when banking in curved road?
  30. T

    Solving for Frictional Force in Banked Curve Problem

    Homework Statement A certain curve on a freeway has a radius of 200m and is banked at an angle of 25°. A 200-kg car moves around the curve at constant speed. 1. If the speed of the car is 35m/s, what friction force is needed to keep the car moving in a circle? 2. If the speed of the car...
  31. N

    Centripetal Force - Banked Curve

    Homework Statement A 1000kg car travels around a frictionless banked curve having a radius of 80m. If the banking is 20 degrees to the horizontal, at which specific speed must the car travel to maintain a constant radius? Homework Equations Fc = mv^2/r Fg(perp.) = mgcos(20) The...
  32. G

    Centripetal acceleration question: car moving around banked curve

    If the wheels and tires of a car are rolling without slipping or sliding when turning, the bottom of the tire is rest against the road at each instant, so the force of friction is the static friction. Essentially if you are moving around a banked curve and the car is not skidding, then friction...
  33. C

    Possible friction force needed for a car on a banked curve

    Homework Statement A 1200kg car rounds a dry curve (μ= .6)with a radius of 67 m banked at an angle of 12°. If the car is traveling @ 95 km/hr (26.4 m/s), will a friction force be required? If so how much and in what direction? Homework Equations Fn = mg cos 12° ƩFn sin 12° = m (v^2/r)...
  34. S

    Solving Banked Curve Friction Problems

    ƩHomework Statement A car of mass 2,000 kg is moving round a curve on a banked track (see diagram-We were actually only given the top picture "a" and not the bottom one, but both are relevant) at a constant speed. The coefficient of static friction between the car's tires and the track is...
  35. D

    Circular motion- banked curve, show that friction is necessary

    Homework Statement A 1200 kg car rounds a banked curve of radius 70 m. If the banked angle is 12° and the car is traveling at 90 km/h, show that friction is necessary in order for the car to safely make the turn. Homework Equations Force of gravity: Fg=m*g to calculate the normal...
  36. 1

    Banked curve angle w/no friction - teacher's work differs

    Homework Statement At what angle should the roadway on a curve with a 50m radius be banked to allow cars to make the curve at 12 m/s even if friction is 0? Homework Equations The Attempt at a Solution All of the centripetal acceleration comes from normal force from the road on...
  37. R

    Static friction on banked curve

    If a curve with a radius of 89.0m is perfectly banked for a car traveling 71.0km/hr, what is the minimum coefficient of static friction for a car not to skid when traveling at 91.8km/hr? I figured out theta = 24. 03degs from the equations F(normal)*cos(theta) = mg and F(normal)*sin(theta) =...
  38. C

    Car going around banked curve with no friction

    Homework Statement a racecourse is designed with curves with a radius of 200m and a 10degree banking. What is the maximum speed a car can negotiate the curve without friction? Homework Equations Newtons 3 laws The Attempt at a Solution tanTheta = v^2/gR tan10 = v^2/(9.8 * 200m) v...
  39. B

    Centripetal Force: Banked Curve

    Homework Statement A 1200 kg car travels around a curve banked at 42.5 degrees in a circular path of radius = 150m, but the ramp is only 55m long. The force of friction on the car is 9000N, calculate the speed of the car. So: radius = 150 m θ (angle the incline makes with the...
  40. P

    Angle for a banked curve (friction-less surface)

    Homework Statement At what angle should the roadway on a curve with a 50 m radius be banked to allow cars to negotiate the curve at 12 m/s even if the roadway is frictionless? a. 0° b. 12.2° c. 17.1° d. 35.0° e. 73.2°Homework Equations β=arctan(v^2/r*g) The Attempt at a Solution im using...
  41. E

    Question on banked curve, Application of Newtons Laws

    Homework Statement A turn in the road with a radius of 30m is banked at an angle of 40 degrees. If \mu=.75, what is the minimum and max speed a 1200 kg car can travel without sliding off the turn. Homework Equations F=ma, Mv^2/R, Fw = mg The Attempt at a Solution Alright, so...
  42. B

    Circular motion and banked curve problem

    I am stumped on this problem. If anyone can help it would be greatly appreciated. A plane is approaching an airport in a traffic holding pattern. While awaiting its clearence to land, the plane traverses a horizontal circle of radius 2520 meters at constant speed, Each complete turn of the...
  43. S

    Banked Curve perfectly banked

    Banked Curve "perfectly banked" Homework Statement if a curve with a radius of 88. is perfectly banked for a car traveling 75km/h, what must be the coefficient of static friction for a car not to skid when traveling 95km/h? Homework Equations ƩF=ma and a=v^2/r and Ff=μFnThe Attempt at a...
  44. D

    Banked Curve Problem: Solve Bicycle Speed & Friction Coefficient

    Hey guys I know this is probably easy for most of you but I need help with a banked curve problem. The problem is as follows "Suppose you ride a bicycle in a 20-m-radius circle on a horizontal surface. The resultant force exerted by the surface on the bicycle (normal force plus frictional...
  45. Y

    Banked Curve Train Condominium on Mars

    I am researching for a sci-fi screenplay that I am writing for fun. To keep bone density from losing the estimated 1.5% per month on Mars I want to simulate Earth gravity by having the colonists live aboard condominiums that are fitted with a rail car suspension and travel in a perfect circle in...
  46. B

    Simple banked curve, centripetal acceleration problem

    If a car can negotiate a curve of radius 200 m at 30 m=s without any frictional force being required, what is the banking angle r = 200 m v = 30 m/s tanΘ = v2/r Θ = tan-1(v2/r] Θ = tan-1(302/200] Θ =77.47 degrees I thought this problem was a simple one, but the answer that is...
  47. T

    Frictionless Banked Curve on Mars Simulates Earth Gravity

    Homework Statement A train on the planet surface of Mars is traveling along a banked track shaped as large circle with a radius of 500m. Q. Assuming Mars gravity is 3.8m/s^{2} what Velocity v must the Martian train travel to simulate a total artificial gravity equal to Earth's...
  48. S

    Help With Banked Curve rotational motion

    Homework Statement I;m trying to prove if this guy is guilty or not, after crashing on a curve. This is mulitpart, but i will only do one at a time to not confuse. The first thing I have to do is find the coefficient of static friction. I have a drag sled test, which required a force of 42...
  49. S

    Uniform circular motion on a banked curve

    Homework Statement A car with mass 1200kg rounds a curve banked at 18 degrees. The radius of the curve is 130 m. Find the speed of the car if the frictional force between the tires and the road is 3.5 x 10^3 down the banked curve. Homework Equations ac = v2/r The Attempt at a Solution...
  50. W

    Solve Banked Curve Homework: Find Theta Given Radius, Speed, and Mass

    Homework Statement A curve of radius 52.4 m is banked so that a car traveling with uniform speed 55 km/hr can round the curve without relying on friction to keep it from slipping to its left or right. The acceleration of gravity is 9.8 m/s2 . The mass of the car is 1800kg. What is θ...
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