# What is Traction: Definition and 47 Discussions

Traction is a set of mechanisms for straightening broken bones or relieving pressure on the spine and skeletal system. There are two types of traction: skin traction and skeletal traction. They are used in orthopedic medicine.

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1. ### I Is there traction force between moving electrons & copper wire?

Common sense: walking on road, there is traction between shoes & earth. I'm wondering: same thing for electric current's electrons & copper wire?
2. ### Leg suspended in a traction system

A leg is suspended in a traction system, as shown in the attached image. (a) Which pulley in the figure is used to calculate the force exerted on the foot? (b) What is the tension in the rope? Here T is the tension, wleg is the weight of the leg, and w is the weight of the load that provides the...
3. ### Deformable solids : Traction / Compression

Hi, I use the equation above to isolate N(x), I get ##N = -\int_0^x qdx## I don't know how to get the value of q. The dimensionnal analysis give me : ## q = \frac{\rho g S x}{L}##, but I'm not sure. Thanks for your help !

6. ### Boundary condition: null traction on the boundary of an elastic block

Hi everyone, I'm trying to understand the rationale behind the boundary condition for the problem "Finite bending of an incompressible elastic block". (See here from page 180).Here we have as Cauchy Stress tensor (see eq. (5.82)): ##T = - \pi I + \mu (\frac{l_0^2}{4 \bar{\theta}^2 r^2} e_r...
7. ### Does MTB rider position affect bike cornering traction?

So there's this idea in mountain biking that keeping your weight over the tire contact patch equates to more cornering traction. What I mean is instead of leaning with the bike, you lean the bike under you while staying mostly over the tires (see the right "Bike more than body" image below)...
8. ### Reaction torque in a traction system

Hello PF, I am building a traction assembly for a self balancing bot project and I am having some conflict with my intuition and practical testing results. The setup consists of a motor mounted to a chassis, the shaft coupled to a wheel that rests on a surface with non-zero friction. Below...
9. ### Tire Traction on Sand: Maximize Friction

i have a question that i can't seem to find the answer to, if you are in an suv and youre going up a sand slope slow like 5miles per hour , up to a point the suv will slow down and the wheels start to slip, you can use momentum to go over i know, but say i was in 2 wheel drive vs 4 wheel drive...
10. ### I Is there so-called "optimal traction" for vehicles?

Consider for vehicle, a low traction indicates a lower road grip, which leads to a skid easier; a high traction makes the vehicle difficult to steer, and also damages both road and tire. So I am wondering if there is a balance point of the traction in vehicle design such that it is at an...
11. ### B Why do chains on tires provide more traction in the snow?

Wouldn't the chain easily get caught on a rock or something? And how does metal provide more traction than rubber wheels?
12. ### Why are the traction vectors on each surface independent?

Hey y'all, my first thread here, Got a burning question that has been disturbing my serenity. In all derivations of the stress tensor that I've seen they didn't explain it that much, So my question is, why do the traction vectors on each surface are independent? From what I understood, the...
13. ### Russell Traction Apparatus: Find W & Traction Force

Homework Statement In order to prevent muscle contraction from misaligning bones during healing (which can cause a permanent limp), injured or broken legs must be supported horizontally and at the same time kept under tension (traction) directed along the leg. One version of a device to...
14. ### Traction question -- Best braking strategy in snow and ice

When driving on snow and ice does engine braking (by downshifting) provide more traction than applying brakes in a slow and controlled manner?
15. ### Russell Traction Apparatus

Homework Statement The device shown in the figure below (Figure 1) is one version of a Russell traction apparatus. It has two functions: to support the injured leg horizontally and at the same time provide a horizontal traction force on it. This can be done by adjusting the weight W and the...
16. ### Automotive Solving Traction & Friction Issues with Car Simulation

Hi, I'm simulating the behavior of a car and I have some troubles with the tires. Specially with slip when the car is accelerating. I've seen many documents over the internet and I understood 2 main things: Wheel slip is necessary to accelerate & the coefficient of friction depends on the slip...
17. ### Need to know about Surface Voltage

If we apply an electrical insulating material on a bare conductor which carries 25 Kv AC Voltage. What would be the surface voltage observed on the insulating material? Is there any test/method by which surface voltage can be measured on the Insulating Material. The Insulating material has...
18. ### Traction/ Compression stress and strain exercise

Hello everyone, could you help me with this exercise? I am stuck, and I can't find anything on the internet that solves this. Your help is very much appreciated :) 1. Homework Statement Circular steel bar, clamped at extremities. Two parts: A(ab)=800mm² A(bc)=400mm² L(ab)=...
19. ### Calculating Tractive Force using two methods

1. A car accelerates 1800m down an incline of 1 in 4 at 0.4ms^2. The car has a mass of 4,000kg and the resistance to motion is 400N Determine: a) The Tractive effort required by using D'Alemberts principle b) The Tractive effort required by using the conservation of energyHomework Equations...
20. ### Automotive Formula 1 Traction Control tuning

Hello, I'm a mechanical engineering student and I'm working in traction control for Formula 1 cars. The traction control in the cars is simple, too simple: an engine cut is done when the engine is at a certain RPM and slip value. A matrix of four values of RPM and slip has to be provided to...
21. ### Traction and 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...
22. ### Tire Torque & Traction Force: Sprocket Attached to Rear Axel

my sprocket is rigidly attached to rear axel ,is there any difference in torque at sprocket and tire?
23. ### Experimental data modelling off-road vehicle travel

Hi everyone, I am looking for any available experimental data which models off-road vehicle travel in clay and measures tyre and soil parameters. Parameters I am looking for include pull, torque, shear strength of the soil, sinkage, slip and deflection. If anyone knows of any available raw data...
24. ### How to calculate potential traction loss on a haul road

Homework Statement This is a mining engineering question, but the section I need help with is more general: I am working through a long question regarding a given mine. In previous sections of this question, I have selected equipment based on required machinery outputs etc. I have now come to...
25. ### Calculating Traction Force for Leg Fracture Treatment

Homework Statement When the thigh is fractured, the patient's leg must be kept under traction. One method of doing so is a variation on the Russell traction apparatus. If the physical therapist specifies that the traction force directed along the leg must be 25N, what must W be? Homework...
26. ### Traction application -- Which type of motor is best?

in traction applications which motor is best suitable? previoulsy dc series motors were used in traction applications due to there excellent starting torque.but now a days it is being replaced by induction motors.why can't we employ synchronous machine in traction application?
27. ### Solving A Rocket & Traction Apparatus Challenge

Homework Statement A) A rocket fires two engines simultaneously. One produces a thrust of 675N directly forward while the other gives a thrust of 450N at an angle 20.4∘ above the forward direction. a) Find the magnitude of the resultant force which these engines exert on the rocket...
28. ### Normal traction and displacement for pin-hole problem

Consider a circular pin-in-a-hole problem in two dimensions. Let the plate containing the hole be infinite so that the dimensions of the circular pin are very small compared to the plate. The conditions of plane stress be assumed everywhere. Also, let the pin be loaded with a force applied at...
29. ### Pulley Traction in Equilibrium

Homework Statement Sum of downward forces exerted at A and B is 41lbs by the leg, what is the weight attached? Homework Equations None, really... The Attempt at a Solution Tension (T) throughout the system must be constant and equal to the weight (W). I first assumed that the leg...
30. ### Contact Pressure Vs Traction Vs Deformation in a wire

Homework Statement A .1in aluminum wire is being pulled from a coil between 2 1in steel rollers. One roller is fixed to the driving motor while the other roller is loaded with a force to provide traction. What is the maximum force that can be applied before the wire is plastically deformed by...
31. ### Proportionality of Traction and Wheel Slip

Hi All! I've been doing some research in an attempt to uncover the proportionality between usable traction, which is defined as the the product of coefficient of static friction and the normal force, and the wheel slip. Given the nature of the the equation for usable traction, I expected that...
32. ### Calculate traction power

Homework Statement Hanging rolls of toilet paper The one they depend on so that the loose end hanging down the front, but many of the other way around. It raises the question, in which the orders are less force must be applied to roll. For this purpose, a simplified model are considered...
33. ### Which wheel loses traction first?

When you drive a real wheel drive too fast around a corner, the two inner wheels lose some down-force due to mass transfer. If you oversteer, does the rear inner wheel lose traction first? And then trigger the oversteer? If so, are there any equations to determine how the weight is...
34. ### Axial traction of a beam on support

hello My question is rather off the usual queries concerning beams, which is maybe why I'm struggling to find a solution. If we suspend a totally rigid beam at its extremities with springs to measure forces, the springs will both indicate q x L /2. If the beam is supple, it will sag and...
35. ### Calculating traction fields

Homework Statement Question (specifically part b): Solution: The Attempt at a Solution My issue is that I don't agree with \Gamma^{0}_{3} and \Gamma^{1}_{3}, surely if they're given by [S][n] they should be given by \mp(0,0,\rho g x_{3}). The answers they have don't make sense, because...
36. ### How does traction compare to the width of a tire?

Please help settle this argument I had with a friend. We both have fast FWD cars, and on road courses we both have problems with oversteer (where the back of the car slides out on corners). He says if I put wider tires on the rear of my car, I will have less oversteer. My understanding of...
37. ### TENSION PROBLEM on traction system

Homework Statement What is the tension on the traction system?? i was given this picture.. the M= 10kg.. I got this picture,, the traction system is the figure that has a feet hanging. Homework Equations T=W=mg T=W=m2g The Attempt at a Solution T=W=10*9.8m/s =98N. T=W=10(2)...
38. ### Traction Around a Cylinder

I have been trying to figure out the formula for maximum load held by traction of a band or strip wrapped around a cylinder where there is a given force holding the other end of the strip. Suppose the strip is wrapped 180 degrees around a horizontally positioned cylinder so that the strip is...
39. ### An Exponential Traction

I have some questions I have labeled below: I believe that the coefficient of static friction, (let's call it Csf), equals the maximum force of static friction (before it slips), Fsmax, divided by the force bringing the two surfaces together (a force in the direction of the normal to their...
40. ### How do I get momentum to assist rotational force from overcoming traction force?

(video game) I have a car and it is accelerating wonderfully. But I need to know when my acceleration is too great from my traction force and my tires should slip reducing acceleration. Currently what I'm doing is calculating rotational force = EngineTorque * transmision gear ratio * rearend...
41. ### Wider tire giving better traction debate

so I've joined this forum to discuss this topic. IN class I've learned that wider tires does not give better traction and it is the same traction similar to a more narrow tire. now i have friends telling me that i am wrong bringing up that F1s do not use narrow tires because of traction. if...
42. ### Net traction force on a pulley

1. Homework Statement Can you see the picture? "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 4 kg, and the octor has decided to hang a 6 kg mass from the rope...
43. ### Traction Force simplification, what variables?

I am building a very simple car game, and was trying to come up with some attributes for car part upgrades. I've come to the assumption that every suspension part, including but not limited to: shocks/springs/tires, contributes to the traction that the vehicle has. (springs/shocks contribute in...
44. ### Difference between Traction and Tractive Force ?

Difference between "Traction" and "Tractive Force"? I need to know exactly what the difference is between "Traction" and "Tractive Force". The more specific and detailed the better. I can find definitions of "Traction" but nothing really on "Tractive Force". This is specifically in...
45. ### What does traction free mean?

What does "traction free" mean? What does "traction free" mean? Is it a boundary condiction that there's no stress action on that boundary? Or...? Thanks a lot!
46. M

### Robots and traction on an incline

I'm a high school teacher. I have students competing by racing Lego robots up an incline. I can calculate the force due to friction down the incline and the force of gravity parallel to the plane but am unable to clearly identify the relatioship between these two forces and whether a robot...
47. ### How Does Traction Control Make F1 Cars Harder to Drive?

Been brought to my attention in another topic, so just how is it that technologies suck as traction control make a formula 1 car harder to drive? This is directed at Mr Robin Parsons, but obviously anyone can join in.