Belt Definition and 230 Threads

A belt is a loop of flexible material used to link two or more rotating shafts mechanically, most often parallel. Belts may be used as a source of motion, to transmit power efficiently or to track relative movement. Belts are looped over pulleys and may have a twist between the pulleys, and the shafts need not be parallel.
In a two pulley system, the belt can either drive the pulleys normally in one direction (the same if on parallel shafts), or the belt may be crossed, so that the direction of the driven shaft is reversed (the opposite direction to the driver if on parallel shafts). As a source of motion, a conveyor belt is one application where the belt is adapted to carry a load continuously between two points. The belt drive can also be used to change the speed of rotation, either up or down, by using different sized pulleys.

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  1. T

    An inclined conveyor belt, gravity, and rolling shapes of differing types

    I have looked around several internet Physics sites and information sources, and even asked questions here and in other places, and can't seem to find answers to my questions about a thought experiment I came up with: Think about three similar cases: A ball, a solid cylinder, and a hollow...
  2. K

    Belt tension using bending and shear stresses

    Well I know I need to plot Mohr's circle for this, but what are the things i need to do before reaching that stage.here is the question: A 250mm diameter pulley is mounted on a 50mm diameter shaft at a distance of 200mm from a ball bearing. If the belt tension ratio is 3 to 1 determine the...
  3. B

    Belt Drive power tramsmission and torque

    Homework Statement iv been given this problem having attmepted it I am stuck when it comes to calculating maximum torque and can't seem to find any equations to help me out. in a belt drive system the speed of the belt over the pulleys is 170/min. The initial tension of the belt is 400N...
  4. M

    What is the effect of conveyor belt inertia on the movement of a ball?

    This is a possible problem that I can have on my quiz. There is ball on a conveyor belt. The belt is moving to the right, and a circular motor is running the belt. The belt starts of straight then starts to bend where the circular motor is. The circular motor is just at where the bend occurs...
  5. B

    Torque Distribution through a Two Stage Belt Drive

    Hello All I am trying to work through a belt drive design and I am confused with a simple concept. I have a two stage system that has a max torque input of 110N. I want to treat this as "worst case", so I assume that all of the torque is used at the final output flywheel. The first...
  6. JJBladester

    Conveyor belt and friction- Determine slip time

    Homework Statement A series of small packages is moved by a conveyor belt that passes over a 300mm radius pulley. The belt starts from rest at t=0 and its speed increases at a constant rate of 150 mm/s2. The coefficient of friction is μ=0.75. Determine the time the first...
  7. D

    Find the extra force required to maintain the speed of the belt

    Homework Statement coal is falling onto a conveyor belt at a rate of 540 tonnes every hour. the belt is moving horizontally at 2.0 ms-1. find the extra force required to maintain the speed of the belt. (1 tonne=1000kg.) Homework Equations F=m*a The Attempt at a Solution i...
  8. JJBladester

    Relative motion on a conveyor belt

    Homework Statement Belt A conveys sand with a velocity of 6.0 ft/s (constant). The velocity of belt B is 8 ft/s (constant). Determine the velocity of the sand relative to B as it lands on belt B. Answer: VS/B=20.1 ft/s at 85.1 degrees Homework Equations VS/B = VS-VB (Velocity of...
  9. A

    Seat Belt constraints in a crashing car

    Homework Statement A person who is properly constrained by an over-the-shoulder seat belt has a good chance of surviving a car collision if the deceleration does not exceed about 30 "g's" (1.0 g = 9.80 m/seconds squared). Assuming uniform deceleration of this value, calculate the distance...
  10. C

    Torque on Pulley sitting on moving belt

    Homework Statement There is a Pulley (or just a wheel) sitting on a moving belt being pulled with force Fa with some unknown friction between the pulley and the belt. The pulley rotates without slipping on the belt. Draw a freebody diagram of the pulley and the belt. Homework Equations...
  11. R

    What is the power required for the belt to maintain its velocity

    Homework Statement Corn is falling vertically down on a conveyor belt at a constant rate of 1 kg/s. The corn instantanoulsy gets the forward speed of the belt of v = 5m/s. What is the power required for the belt to maintain its velocity. Homework Equations p=mv dp/dt=F F*v=P...
  12. T

    Calculate Power Needed for Conveyor Belt System

    Homework Statement It's been a while since I've had mechanical physics so I'm simply seeking which formulas will be needed for me to calculate what I need, then I will attempt a solution and post my responses. My problem is this: I'm trying to figure out what horsepower motor I need to...
  13. D

    How do you find how far a belt travels using diameter and rps

    the foot operated sewing machine shown below has a driver pulley which is 30cm in diameter and is attached by a belt to a sewing pulley with a 5cm diameter. The sewing machine makes one stitch for each revolution of its sewing pulley. a. The driver pulley is turned easily at one revolution...
  14. G

    Calculating Driving Force on a Conveyor Belt with Baggage Load?

    A conveyor belt consists of a horizontal endless belt running over driving rollers, moving at a constant speed of 1.5m/s. To keep the belt moving requires a greater driving force than for an empty belt. On average, the rate at which baggage is placed on one end of the belt and lifted off at the...
  15. D

    Angular Speed Between 2 rims attached by a belt

    So I'm new to the Physics Forums and am looking for some help on this problem: Wheel A of radius r=10cm is coupled by belt B to wheel C with radius R=25cm. the angular speed of wheel A is increased from rest at a constant rate of 1.6 rad/s^2. Find the time needed for wheel C to reach an...
  16. D

    Angular Speed Between 2 rims attached by a belt

    So I'm new to the Physics Forums and am looking for some help on this problem: Wheel A of radius r=10cm is coupled by belt B to wheel C with radius R=25cm. the angular speed of wheel A is increased from rest at a constant rate of 1.6 rad/s^2. Find the time needed for wheel C to reach an...
  17. J

    Can an airplane on a conveyor belt achieve flight?

    This question was posed on another forum. I figure the best place to get the true answer would be on a forum dedicated to physics. If there was an airplane with wheels and the wheels are resting on a giant conveyor belt, will the plane achieve flight? The conveyor belt will match the speed of...
  18. V

    Exploring the Photon Belt and Our Solar System

    Ok i came across this mumbo jumbo and i just wanted to know if there's any scientific proof that the sun is orbiting some other body besides the galactic center here's what he says then he gets crazy talking about Atlantis and aliens and accension and all sorts of other crackpottery that i...
  19. D

    Solving Conveyor Belt Problems: Force, Magnitude, and Power Calculations

    i have a test tomorow and our teacher gave us an example of a problem that might be coming tomorow. the question is Sand falls on a conveyor belt at 60 kg per second and the belt moves at 2 meters per second. a) what is the force moving the sand? b) what is the magnitude of the force? c)...
  20. B

    The Van Allen Radiation Belt and Space Travel

    [Post edited by Ivan] I've heard that the intense radiation from the Van Allen belt would make it impossible to travel to the moon or send anything to Mars etc. It's obviously possible to have satellites or the ISS (which is only I think 330 miles above us). People say that the radiation from...
  21. H

    What Is the Total Economic Value of the Asteroid Belt?

    I'm working on a potential posting about the total economic value of all possible mined ores in the asteroid belt. This is something of an experimental draft to follow below. The total mass of the asteroid belt has a minimum and maximum estimate. What is 3.0Kg to the 1021st power Minimum...
  22. N

    What is the force acting on a box on a conveyor belt?

    I'm trying to figure this out. Suppose a box is on a conveyor belt, and the conveyor belt is moving faster and faster to the right, so that static friction has already been overcome. This means that relative to the conveyor belt, the box is accelerating to the left. But what is the net force...
  23. J

    What is the critical deceleration at which a seat belt locks?

    Homework Statement At some critical deceleration, a seat belt will lock into place, preventing a driver/passenger from pulling it out any further. What is that critical deceleration and why? Homework Equations I have not quite figured this out yet, because it would depend on how you...
  24. B

    Bearing Loads in a Belt Drive System

    I have a question regarding the bearing loads on a set of rotating shaft systems. The two systems are belt driven, each with one driver and one driven pulley. Belt tension is higher in system one than in system two. Rotational speed is higher in system two than in system one. The pulley...
  25. A

    Finding Load on Pulley Shafts with Belt Drives

    Dear all, My objective is to find shaft load in which belt pulley is mounted and load being transmitted via belt. In the case of two pulley belt drives ,the load to the pulley mounting shafts calculation can found by getting guidance in almost all textbooks(T1 &T2 relations). Where in my...
  26. Z

    Proof of planetesimals for asteroid belt?

    If asteroid belt objects are in part iron, is this then consistent with such differentiated pieces being solidified remains of a liquid core(s) of previous colliding planetesimals? p.s. total mass of asteroid belt may be just 4% of moon. http://en.wikipedia.org/wiki/Asteroid_belt"
  27. N

    [Theory of Machines] Why is Belt in a Belt drive a Link

    Hello every1... I'm a mechanical enggineering student... I've been studying theory of Machines... My academic syllabus includes only "Simple Mechanisms"... Now in Simple Mechanisms...the first thing we get to know is a "Kinematic Link"... Definition of a Kinematic Link:-it is a rigid or...
  28. Philosophaie

    Location of the Asteroid Belt between Mars and Jupiter

    There is an Asteroid Belt between Mars and Jupiter. I have a few questions about it. Where does it start and end (Radius from the Sun)? Also, the Right Ascensions and Declinations of the extents of the belt or if it is continuous around the sun? I know that some of the larger asteroids...
  29. B

    Compute the surface charge density on the belt

    I need the answer to this question A charge belt, 50cm wide, travels at 40m/s between a source of charge and a charging object at a rate corresponding to 100microA . Compute the surface charge density on the belt Some one told me the answer may be 5 microC/m2 but how ??
  30. P

    Solving Belt Around Pulleys Homework: 0.6 m/s, 1.44 m/s2, 1.56 m/s2

    Homework Statement A belt passes over two pulleys O1 (radius R1= 0.4 m) and O2 (radius R2 = 0.6 m) as shown, and points A and B are on the rim of the pulleys. The normal acceleration at A is 0.9 m/s2 and the angular acceleration of pulley O1 is 3.6 rad/s2. Find (a) the belt velocity υb, (b)...
  31. K

    Rotational motion of belt drive

    Homework Statement I'm just working through a few past mechanics papers and this question came up: A belt drives the circumference of a cylindrical wheel of radius R and mass M with no slipping. The tension in the belt is T. Friction in the wheel bearing causes an effective torque N...
  32. R

    Find Extra Force & Power to Keep Conveyor Belt Moving

    Homework Statement Sand drops are falling gently at the rate of 2 kg/sec on a conveyor belt moving horizontally with a velocity of 5 m/s. Find the extra force and power required to keep the conveyor belt moving at constant speed. Homework Equations Total work done on a body= Change in...
  33. C

    Why doesn't the asteroid belt block our view of the jovial planets?

    Why doesn't the asteroid belt block our view of the jovial planets? I'm assuming it's because the asteroids are just too few, far apart, and small to affect our view, but I'm not sure and I'd like to know. Thanks!
  34. O

    Belt friction - determining angles

    Homework Statement A cable passes around three 2-in-radius pulleys and supports 2 blocks as shown. Pulleys C and E are locked to prevent rotatoin, and the coefficient of friction between the cable adn the pulleys are static = .20 and kinetic = .15. Determine the range of value of the weight of...
  35. D

    Power needed to keep velocity of conveyor belt constant

    Homework Statement A conveyor belt travels at a constant velocity v while sand is poured onto it at rate of \frac{dm}{dt}. Find the power needed to drive the conveyor belt.Homework Equations P = \frac{dW}{dt} = F*v F = m*\frac{dv}{dt}The Attempt at a Solution I have the equations needed to...
  36. S

    Friction/Kinematics Question. Conveyor Belt.

    Homework Statement A baggage handler drops your 8kg suitcase onto a conveyor belt running at 1.8 m/s. The materials are such that the static coefficient of friction is .4 and the kinetic coefficient of friction is .6. How far is your suitcase dragged before it is riding smoothly on the belt...
  37. R

    What is the force exerted by a seat belt in a head-on collision?

    In a head-on collision, a car stops in 0.18 from a speed of 22 . The driver has a mass of 75 , and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fraction of a second?
  38. U

    Calculating Belt Length for Pulley Rotation

    A narrow belt is used to drive a 20.00-cm diameter pulley from a 35.00-cm-diameter pulley. The centers of the two pulleys are 2.000 m apart. How long must the belt be if the pulleys rotate in the same direction? In opposite directions? I am sure the solution to this problem is very simple...
  39. wolram

    Tightening Your Budget in a Tight Economy

    Are price increases creeping into your budget yet? I have had to put a couple of extra holes in my belt ,but that may be because of the excessive amount of physical work i have to do rather than eating less, on the other hand i do tend to look at prices now instead of just putting an item in...
  40. H

    Friction of conveyor belt on suitcase

    Homework Statement A baggage handler drops your 10 kg suitcase onto a conveyer belt running at 2 m/s. The materials are such that us= 0.5 and uk=0.3 [coefficients of static and kinetic friction]. How far is your suitcase dragged before it is riding smoothly on the belt? Homework...
  41. B

    Design 3-Axis Belt System w/ 1.5kW Motor & Flat Multi-Vee Belt

    I am attempting to design a basic 3 axis system, where the motor to idler ratio is 3:1, and the idler to driven ratio is 1:2. The motor is 1.5 kW, variable speed. All three axis are in vertical alignment. This is a belt drive using a flat multi-vee belt. My problem is trying to explain the...
  42. A

    Momentum and Collision with a seat belt

    Need some help, got a 50 question review packet of questions to finish and am having trouble with these 2. please and thank you: 1. A friend claims that as long as he has his seat belt on, he can hold on to a 12.0-kg child in a 60.0 mi/h head-on collision with a brick wall in which the car...
  43. D H

    Can a plane take off on a conveyor belt?

    We will finally have an answer to this silly question on January 30, when the boys at MythBusters try to make a plane take off while on a moving conveyor belt. A preview: http://www.youtube.com/watch?v=KSBFQOfas60".
  44. S

    Solve Time for Wheel C Rotational Speed 108.3 rev/min in Belt Drive Problem

    Homework Statement Wheel A of radius ra = 6.5 cm is coupled by belt B to wheel C of radius rc = 32.8 cm. Wheel A increases its angular speed from rest at time t = 0 s at a uniform rate of 6.2 rad/s2. At what time will wheel C reach a rotational speed of 108.3 rev/min, assuming the belt does...
  45. A

    Curved Conveyor Belt Rollers Motors Placement Airport

    does anyone know how the rollers and motors are place in the U-shaped part of a curved conveyor belt used in airports?? any links or pics would be appreciated ??
  46. H

    Would Repealing Seat Belt Laws Change Behavior?

    If there were no law requiring the use of seatbelts, would you choose not to wear one? I'm questioning the effectiveness of the seat belt law. I think that someone who is irresponsible enough to not wear a seat belt is also irresponsible enough to ignore the law requiring that they do. While...
  47. C

    SHO on a Conveyor Belt: Exploring the Dynamics of a Mass on a Moving Surface

    This one is killing me. Homework Statement A SHO is resting on a horizontal surface with which it has static and kinetic friction coefficients us and uk . We have k for the spring constant and m for the mass. The surface is actually part of a conveyor belt that is maintained at a speed u...
  48. M

    How to Calculate Beta Angle for Pulley B in a Frictional Belt and Pulley System?

    Homework Statement I've attached a picture of the problem. I couldn't get beta=120 degrees, for pulley B. How do you get that. Could the question be mistakenly missing this info in the question?
  49. O

    What Forces Act on a Box on a Rough Conveyor Belt with Acceleration?

    Homework Statement A cubical block of mass \ M and side length \ L with small feet attached to the 4 corners of its base is placed on a rough conveyer belt initially at rest. The centre of mass of the box is midway between the front and rear feet and is a height \ h above the belt. The...
  50. G

    Can Mars Effect the Asteroid Belt?

    I was looking at this picture of the asteroid belt on wikipedia http://en.wikipedia.org/wiki/Image:InnerSolarSystem-en.png And assuming that the picture is somewhat accurate in the placing of distance between objects in the solar system, I couldn’t help but wonder if it’s possible that the...
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