What is Lift: Definition and 613 Discussions

A surface lift is a means of cable transport for snow sports in which skiers and snowboarders remain on the ground as they are pulled uphill. While they were once prevalent, they have been overtaken in popularity by higher-capacity and higher-comfort aerial lifts, such as chairlifts and gondola lifts. Today, surface lifts are most often found on beginner slopes, small ski areas, and peripheral slopes. They are also often utilized to access glacier ski slopes because their supports can be anchored in glacier ice due to the lower forces and realigned due to glacier movement.
Surface lifts have some disadvantages compared to aerial lifts: they require more passenger skill and may be difficult for some beginners and children; sometimes they lack a suitable route back to the piste; the snow surface must be continuous; they can get in the way of skiable terrain; they are relatively slow in speed and have lower capacity.
Surface lifts have some advantages over aerial lifts: they can be exited before the lift reaches the top, they can often continue operating in wind conditions too strong for a chairlift; they require less maintenance and are much less expensive to install and operate.

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  1. R

    How Do You Calculate Motor and Drive Specifications for a Construction Lift?

    Urgent calculation: design a construction lift... the construction lift is used in a building construction project. the construction will raise building materials from ground level to any height up to 12.2m. The life will be at the top of a rigid scaffold that is not a part of the design...
  2. R

    Design a Construction Lift: Urgent Calculation Solution

    Urgent calculation: design a construction lift... the construction lift is used in a building construction project. the construction will raise building materials from ground level to any height up to 12.2m. The life will be at the top of a rigid scaffold that is not a part of the design...
  3. S

    Calculating Force for Lifting Weight at Different Angles

    can you please help me with this as i am confused? I am designing a frame for my project. I have a rod GF connected to rod AB at point F at 45 Degrees. The dimensions are mentioned in the attached word file. There is a weight of 1 Kg at side resting on rod AB nead end - A. what is the...
  4. W

    Euler's Method for motion of golf ball with lift

    Homework Statement We were given two equations of motion for a golf ball with lift. We must figure out the maximum range using an initial velocity of 255 ft/sec. I'll just retype what's on the sheet. "Lets incorporate lift. The free body diagram with all the forces shown is depicted in...
  5. A

    How do I calculate the torque required to lift an aeroplane's nose wheel?

    Homework Statement Question refers to the torque required to lift the nose wheel of an aeroplane A retracting nose wheel assembly is raised by the application of Torque T applied to link BC through a shaft B. The wheel and Arm AO have a combined mass of 50KG with a centre of mass at G. Find...
  6. A

    How do you calculate the force needed to lift an object?

    How do you calculate the force needed to lift an object?
  7. F

    How Much Work Is Done on a Lift Pulled Up by a Cable?

    Homework Statement a block of mass m = 20 kg is placed on the floor of a lift (mass M = 1000 kg), the lift is being pulled up distance d =25m by a cable, the normal force on the block FN has a constant magnitude of 300N, how much work is done on the lift by the force on the cable?Homework...
  8. M

    How Does a Hydraulic Lift Work with Different Piston Sizes and Weights?

    Homework Statement A hydraulic lift has two connected pistons with cross-sectional areas 15 cm2 and 460 cm2. It is filled with oil of density 560 kg/m3. Homework Equations a)What mass must be placed on the small piston to support a car of mass 1100 kg at equal fluid levels? A:35.86 kg...
  9. G

    Finding how high a winch can lift a mass before the battery discharges

    Finding how high a "winch" can lift a mass before the battery discharges Homework Statement The EMF of the D cell battery is 1.5 V and the life is about 10 A/hr. 50% of the energy int he winch does actual work and the lifting mass is 50 kg. The winch has a load resistance variable of Rl...
  10. B

    Force required to lift a water propelled rocket

    Hello, I need to figure out the force I require to lift the water rocket that I'm building. It weighs about three ounces or about .0850 kilograms to possibly make it easier. How much force will I need to provide lift-off. Would I take the acceleration due to gravity (9.8) times the weight of the...
  11. C

    Using Compressed Air to Lift a 400lb Load

    can compressed air be used to lift a load of 400lbs about 30 feet into the air i came up with using an air compressor to route compressed air into 4 small rocket nozzles to lift it off the ground how powerful of an air compressor would i need if i wanted a constant thrust of 500lbs coming...
  12. M

    Maximizing Lift and L/D for Your Glider: The Perfect Wing and Airfoil Pairing?

    Hi everyone what kind of wing & what kind of airfoil do you suggest if i want to have max lift & max L/D for my glider?
  13. D

    Heating compressed air to provide lift

    Just a question about heating compressed air.. I know generally how hot air works.. You heat it and particles expand and creates lift. So my question is, Does heating compressed air provide any lift? if so how much in relation to normal air? eg if I had 100m^3 of air heated to 120C...
  14. N

    Lift and Drag component question

    Hey guys, I current picked up Fundamentals of Aerodynamics by John D. Anderson Jr. and am having a little bit of trouble understanding some of the equations i am given. This is the first aero book I've picked up so I am not too familiar with aero concepts or terms yet. On page 20...
  15. T

    Temperature lift of a heat pump

    I've always been told that systems that involve a heat pump need to be designed for a delta T of about 10C, not the more usual 20C, apparently because the pump can't lift the temperature more than this. Is this correct, and why is this so?
  16. M

    Hydraulic lift inquiry big problem

    Hi all, I have quite a perfect understanding of hydraulic lift, yet there is one huge problem that is contradicting my understanding. for a hydraulic lift where you push on on side of diameter d1 piston, and the object on a piston of diameter d2, you get the equation: F1/A1 = F2/A2...
  17. V

    Find torque required to lift a mass

    Homework Statement A crane contains a hollow drum of mass 150kg and radius 0.8m that is driven by an engine to wind up a cable. The cable passes over a solid cylindrical 30kg pulley 0.3m in radius to lift a 2000N weight. How much torque must the engine apply to the drum to lift the weight...
  18. S

    Model Aircraft Design for High Lift

    Hi, I need to make changes to an existing design of a model radio controlled aircraft to increase its lift to carry more payload. Pls confirm my ideas and any suggesstions would be really appreciated. Using wingtips to reduce induced drag and increase lift. Will a Dihedral affect lift in...
  19. A

    Minimum Force to Lift a Cylinder: Explained

    Homework Statement Hey, guys. I have this guy trying to lift this cylinder pass the step with minimum force and so is the question, what's the minimum power that he needs to use and at what angle (alpha)? I also added the solution. The thing I don't understand is, why when the momentum of...
  20. D

    Calculating the Force Needed to Lift a 700 lb Car with a Hydraulic Jack

    1.A man has a hydraulic jack to lift his car. If the smaller piston has a diameter of .75 cm, and the larger piston a diameter of 6.0 cm, how much force will the man have to exert to lift one corner of the car, weighing 700 lb?
  21. A

    How Is Lift Generated on Airplane Wings?

    Alright: I've been getting interested into airplanes and the likes quite a lot recently, and one thing that i find difficult to grasp is how lift is created. From the videos and stuff I've seen, it sounds like lift is generated by pressure differences between the top and bottom of the wing...
  22. Z

    How High Can Two Students Lift an Elephant Using a Hydraulic Lift?

    Homework Statement The 70kg student in the figure balances a 1200kg elephant on a hydraulic lift. A second 70kg student joins the first student. How high do they lift the elephant? diameter of the piston elephant is on = 2.0m diameter of the piston student is on = 0.48m The liquid inside...
  23. J

    What Formula is Used for Part B of the Elephant and Hydraulic Lift Problem?

    Homework Statement http://img186.imageshack.us/my.php?image=gdgdfgta2.jpg the question is on the above link (PART B() Homework Equations deltaF=pg(A1+A2)d2 The Attempt at a Solution deltaF=pg(A1+A2)d2 i used that formula and found that the distance was 0.35m
  24. D

    Calculating Work Required to Lift a Hanging Chain

    Homework Statement A chain hangs verticaly from a building. The chain is 30 ft long and is 5 lb/ft3, how much work is needed ot lift the bottom of the chain to the top.Homework Equations If you put the axis where the chain is hanging your limits would be 0 and -30The Attempt at a Solution So I...
  25. F

    Creating lift equation-NEED HELP

    Creating lift equation---NEED HELP! For a course I am taking, I need to determine a lift equation based on some variables. Propose an equation for lift as a function of your three parameters. That is, if L=lift, A=Area, ρ=air density, and v=velocity, determine L(A, ρ, v). I am just so...
  26. S

    Finding the Height of a Gondola Ski Lift Using Trigonometry

    Homework Statement the gondola ski lift at kystone, Corolrado is 2830m long. On avg, the ski lift rises 14.6 degree above the horizontal. How high is the top of the ski lift relative to the base. Homework Equations tan * = ha/h The Attempt at a Solution i just...
  27. U

    Can Temperature Manipulation Create Lift for Aircraft?

    I was thinking about Bernouli's principle, which shows how to get lift by creating a difference in air pressure above and below the wings of an aircraft, and became curious as to whether a difference in pressure arrived at by other means might also result in lift. Specifically, if air were...
  28. K

    Buoyant Lift Creates Useful Energy?

    Buoyant Lift Creates Useful Energy? I work at a manufacturing plant. One by product of this plant is the issuance of 2000 cfm (cubic feet per minute) of clean air. It is determined that this air could be released from as small as a 3 inch pipe with no adverse harm to the manufacturing...
  29. J

    Calculating Airplane Lift Energy Requirements

    Im trying to calculate energy of the turbines to lift an airplane , by this way, calculating potential energy necessary to lift mass of the plane to an height of, let's say, 2000 meters , ,supose it spend 1 minute in reach this altitude, it gives me a result of the order of 1 megawatts of...
  30. B

    How powerful would an engine have to be to lift 150lbs?

    just out of curiosity if i wanted to lift something about 150lbs out of the air with a jet engine or rocket, to hold it against the Earth's gravitational pull 9.8m/s how much energy/power would i need? would it also depend on how heavy the engine is? and what other factors are there in this problem?
  31. K

    Why does air travel faster over a wing?

    Hi, I was just wondering why the air going over a wing travels faster than the air going underneath? My teacher once said "because it has farther to travel" and I just accepted that at the time, but thinking about it now i don't really see why two adjacent air molecules that part company at the...
  32. A

    Solving Complex Structural Challenges - Can a 1000kg Lift Force Lift 950kg?

    hi, i have this problem that i am trying to figure out, but seems i need some help..:) ii have attached an image and an animation to clearly explain my problem. what i am trying to understand is will the green base with its 1000kg lift force be able to lift the pole with the red dot (950kg)...
  33. 5

    Airplane Wing Lift: Bernoulli & Newton's Laws

    Lift ! (airplanes) Hello, I am writing a research paper about the lift generated by the wings of an airplane. It is about the extent to which the Bernoulli effect and Newton's laws each contribute to creating lift. I planned on calculating the actual value of the lift generated by each...
  34. 5

    Help Newtonian mechanics and Bernoulli/Venturi effect in generating lift

    Hello, this question is about lift in fixed wing flight (airplanes). Is it possible to calculate separately the lift generated by: - Newton's laws (wings deflecting air particles) - Bernoulli effect (difference in air pressure above and below the wings caused by the shape of the...
  35. P

    How Does a Hydraulic Lift Work with Different Piston Sizes?

    Okay, so I'm stuck on the last part of the problem : A hydraulic lift has two connected pistons with cross-sectional areas 15 cm2 and 430 cm2. It is filled with oil of density 620 kg/m3. -------------------------------------------------------------------------------- a) What mass must...
  36. N

    How Is the Hydraulic Lift Formula Derived for Lifting a Car?

    Anyone know how you get the formula F = rho*g*(A1+A2)d2 which is used to find the additional force needed to be applied to a piston to lift a car a distance of d2? Thanks.
  37. D

    Creating a Flying Device Using Vacuum Lift

    I'm working on a project with several others to create a flying device much like a blimp, but smaller and more agile. Our method of life is eighther a light gas like helium or preferablly, a Vacuum system that ajusts the % of vacuum inside a set space to provide lift and control decent. The...
  38. H

    What Does the Scale Read When the Elevator Accelerates Upward?

    [SOLVED] Lift, reading on the scale Homework Statement Mandy stands on a weighing scale inside a lift (elevator) that accelerates vertically upwards. The forces on Mandy are her weight W and the reaction force from the scale R. The reading of the scale is A. R + W. B. W. C. R. D. R – W. The...
  39. N

    Can rotation wt, lift leverage wt

    Question: On one side of a wheel there is 50 lbs of weight, if the wheel is released the weights would rotate with the wheel until the weights where at the bottom and stop. Let's say this wheel has a shaft in the middle of the wheel that turns as the wheel does, if you put weights on one side...
  40. S

    Newton's third law to explain lift

    Ok so I just read this statement as part of an explanation of list using Newton's 3rd law "The amazing thing about wings is that because they are flying through air which is a fluid, the top of the wing deflects air down as well as the bottom of the wing." What I don't understand is how...
  41. D

    Calculating Resultant of Forces on 6.2KG Box in Lift

    A box of mass 6.2KG stands on the floor of a lift which is moving with an upward acceleration of 0.2ms^-2. A horizontal force of magnitude 16N acts on the box. There is no horizontal movement of the box. Find the magnitude and direction of the resultant of the forces, normal and frictional...
  42. K

    Magnetic field strength needed to lift a heavy conductor

    Homework Statement A heavy conductor (mass m, length l, resistance R) is suspended by two springs each with spring constant k, and connected to a battery with electric potential V as shown in the figure. A magnetic field B is now imposed. The acceleration of gravity is 9.8 m/s^2. I'm going to...
  43. J

    How Does a Hydraulic Lift Maintain Equilibrium?

    Homework Statement A hydraulic lift has two connected pistons with cross-sectional areas 25 cm2 and 700 cm2. It is filled with oil of density 570 kg/m3. a) What mass must be placed on the small piston to support a car of mass 1300 kg at equal fluid levels? (answer: 46.4kg) b) With the...
  44. V

    Lift forces acting upon an aircraft

    I've been trying to conceptualise accurately the lift forces upon an aircraft in physics terms, for a simulator flight manual I've been working on. What I've got from some rudimentary flight training is that low pressure above the wing rather than high pressure below it causes lift, obviously...
  45. D

    Applying Pascal's Law to a Hydraulic Lift Problem

    i'm having difficulty with part C of this problem. A hydraulic lift has two connected pistons with cross-sectional areas 25 cm2 and 430 cm2. It is filled with oil of density 500 kg/m3. a) What mass must be placed on the small piston to support a car of mass 1300 kg at equal fluid levels...
  46. S

    Air pressure and force of lift

    I know about Bernoulli's principle and that a difference of pressure below and above a wing create lift, but I cannot find anywhere a formula or any information on how to find the amount of lift given the surface area of the wing and the difference in pressure as a percentage of atmospheric...
  47. L

    Need Help/Idea's Pontoon Lift Lake Weeds

    Hello, I harvest lake weeds and I'm looking for an easier way to remove the aquatic weeds from the water after they are cut. A couple of quick ideas were to use an older pontoon as a way to transport the weeds out of the lake. 1) Thought about some type of hydrolic lift table that could...
  48. I

    Object at rope: work to lift it

    An old oaken bucket of mass 6.75 kg hangs in a well at the end of a rope. The rope passes over a frictionless pulley at the top of the well, and you pull horizontally on the end of the rope to raise the bucket slowly a distance of 4.00 m. So far, I have: F = force exerted by me s =...
  49. B

    Mass of gas required to lift another mass

    [SOLVED] mass of gas required to lift another mass Homework Statement A balloon contains gas of density G and is to lift a mass M, including the balloon but not the gas. Show that the minimum mass of gas required is m=(MG)/(A-G) where A is the atmospheric density. Homework Equations...
  50. D

    Hydraulic Lift.( U tube) and oil

    Homework Statement A 12,000 N car is raised using a hydraulic lift, which consist of a U - tube with arm of unequal areas, filled with oil with a density of 800 kg/m^3 and capped at both ends with tight-fitting pistons. The wider arm of the U tube had a radius of 18. cm and the narrower arm...
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