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. A

    Calculate Torque to lift 7'-9' pole with 5-8 lbs at the end

    I'm trying to figure out what type of motor I need to use that has the ability to lift a 7'-9' pole that has about 5-8 pound weight attached to it at the end. The max angle that the poll will be is 180 degrees and the motor will need to lift it to 90 degrees. As for the weight its not a free...
  2. B

    B Quantum Field Lift: Exploring the Possibility of Lift in the Quantum Vacuum

    Is there analogous "lift" in quantum field just like air can produce lift in aerodynamics. I just rode an airplane and thought that prior to the wright brothers.. people never thought machines can be heavier than air.. then the principle of lift was discovered.. is there a counterpart in the...
  3. MaxKang

    Aspect ratio used in induced drag and lift calculations

    Hello everyone, I am working on a 3.2 meter wing span electric aircraft with another group of 30 engineering students. In calculating the induced drag and lift for preliminary calcs I am a little confused as to whether I need to include the width of the fuselage in the wing span(b) for induced...
  4. E

    Automatic Window Lift: Get Help Setting Up Low-Cost, Efficient System

    Hello all! I'm an electrical/controls engineer by day and farmer by night. I need some insight on an issue I'm having at the farm. We have a greenhouse where I've setup automatic temperature controls. A small PLC reads temperature in the greenhouse. If the temperature gets too high, we open...
  5. T

    Lift a weight up with an EM switch

    Hello, My question is simple. Let's suppose you have an electromagnetic coil with a magnetic weight in the center of it. This coil is energized, and the weight is lifted up vertically. Now, my weight is 30 kgs. I want to lift it to a height of 1 meter. How do I calculate how much power is...
  6. CassiopeiaA

    I Path of Photon in Free Falling Lift: General Theory of Relativity Q&A

    I just started reading general theory of relativity. I have some elementary questions. Not an english speaker so bear with me. I am reading the thought experiment which describes path of a photon in a free falling lift. For an observer inside the lift, the photon path is a straight line. But...
  7. Wing 11

    Correct lift theory-discussion

    Doug Mclean talk about common lift misconceptions.I agree with most of what he said but he claims that downward air flow "downwash" do not exist because integral is zero. I don't agree with this statement,leave mathematics and see what happening in real world. Downwash evidence: What do you...
  8. swotty

    Torque to lift object by cable on a drum accelerating

    Homework Statement An object of mass 1000 kg is lifted by means of a steel lifting cable being wound round a drum of diameter 2.5m mounted on a horizontal shaft. The drum and shaft have a mass of 1000 kg and a radius of gyration of 1.0 m. What is the torque required to give the object an upward...
  9. H

    Energy Required to Lift an Object to Various Heights

    Homework Statement Consider a ball of m = 0.50kg. Does it take the same amount of additional energy to vertically lift it from 15cm to 25cm as it does to lift it from 25cm to 35cm? If not, which takes more? Why? Homework Equations Potential energy: mgh Work = Kf - Ki The Attempt at a Solution...
  10. B

    Lift a hemispherical dome filled with water by rotating it

    Homework Statement A hemispherical dome filled with water, radius 2 m and weight 30 tons, can be lifted by giving it a constant angular velocity around its vertical line of symmetry. The dome has a hole on the top. Decide the minimum angular velocity. My answer is 2.91 rad/s . The correct...
  11. P

    Air Check Valve: Preventing Air Pressure Backup in Lift Fans

    would an air check valve help lift by preventing air presure backup through the lift fan?
  12. justsomeonenew

    Lift Body with Fans? An Exploration of Physics

    Hello everybody, I have a crazy idea in my mind, and I need help of someone who knows about physics ! I was wondering if it could be possible to lift a human body with fans on the ground. I know about vertical wind tunnel (indoor skydiving), but I thought more of a compact and homemade system...
  13. annanause

    Muscle tension required to lift a child at a constant speed

    Homework Statement When a mother lifts he child with her foot (as shown in figure) what force should the upper muscle exert to lift her child at a constant speed? Homework Equations W = F x D f = mg I think these might be the right equations to use, correct me if I'm wrong. The Attempt...
  14. A

    Uses of Lift Force for Plane Surfaces

    Hello, I'm trying to find situations in which it is important or useful to look at the force generated by a difference in pressure due to an increase in velocity of a fluid. I.e, pressure changes due to Bernoulli's equation. This should be simple by itself, but I am looking for situations that...
  15. S

    What is the tension in the lift cable and in the string?

    1. Part One: A mass M1 = 30 kg is suspended by a light string from the ceiling of a lift of mass M2 = 300kg. If the lift accelerates upwards at 1 m/s2, what is the tension in the lift cable and in the string? (g=9.8 m/s) Part Two: If the string breaks when subjected to a tension of more than...
  16. E

    Is my scissor lift's hydraulic system in need of a major service?

    Hello! I have a scissor lift which was http://www.pentalift.com/lift-tables/scissor-lifts&multi-stage.php in 2002. It's been working perfectly until last week. Last week when I tried to lift it with 3 people on it, it didn't go up entirely. We used to lift up to 6 people on it, but now it's not...
  17. Mr lee

    Magnus effect in flettner rotor

    Mr lee said: ↑ hi -new but enjoyed years, wit and wisdom Flettner rotor on a boat - ie. magnus effect Can the vertical rotor create lift? a curve balls 'laces' exaggerate and bend the magnus effect. can you replicate this effect on a rotor? --perhaps to enable another direction of force-- up...
  18. T

    Why is it harder to run underwater but easier to lift

    Both involve water resistance, buoyancy, and density of water and air. Therefore, I would expect that the lift up of your foot would be easy but putting your foot down would be the most difficult. Lifting an object is easier bc of buoyancy force. Although, apart the object must be buoyant...
  19. S

    Lift: Probably my last question

    Maybe there are some questions like this... But I would like to listen to your answers... Thank you! As many people say, there are many ways that describe incorrectly the generation of lift. Two models survive today which are supposed to explain this aerodynamic force, or at least, a part of...
  20. T

    MHB Probability question involving a lift

    Dear friends, I am stuck at the following probability problem. Will appreciate your help. An office block has five floors (ground, 1, 2, 3 and 4), all connected by a lift. When it goes up to any floor (except 4), the probability that after it has stopped it will continue to rise is 3/4. When...
  21. a_c_e

    Gas Spring and Linear Actuator calculation....

    May I start by saying hello to all and that I have visited the site before, but have yet to create an account until now. With that said, I am having difficulty calculating proper numbers for a project I am designing. Mind you, it has been about seven years since I was in any physics or...
  22. C

    Subsea Engineering Question - air required to lift load

    Hi, I am working on a product design which would be used sub sea. It is designed to lift a small load off the sea bed. I have not worked out the exact details yet but the following should be a good start: Load 30Kg Depth 30m I plan on using an air bag of some description - the bag needs to...
  23. AlexKud

    Force required to lift a platform (over the range of angles)

    Homework Statement Hi, this is not really an academic homework but it is something I'm trying to solve for my future project. I have a background in electrical engineering hence I'm having a hard time solving the forces problem. https://dl.dropboxusercontent.com/u/43124243/Force_problem.png...
  24. A

    How could a lever be used to lift the object

    Hello everyone! I'm new here and I have never been too good at physics, but now I've been trying to revise for the MCAT and I have stumbled across this question in "Kaplan MCAT Physics and Math Review": If you have and object three times as heavy as you can lift, how could a lever be used to...
  25. K

    Equation of projectile with drag and lift

    I need an equation that solves for the height of a projectile at a specific x position. The known variables are spin of the ball, initial position, initial velocity, initial launch angle and the drag and lift coefficients.
  26. M

    Power for accelerating a ski lift

    Homework Statement A ski-lift has a one-way length of 987 m and a vertical rise of 275 m. The chairs are spaced 21 m apart, and each chair can seat three people. The lift is operating at a steady speed of 14 km/hr. Neglecting friction and air drag and assuming the average mass of each loaded...
  27. A

    Can we lift water more than 10.3m using atmosphere pressure?

    I'm trying to design a solar heated (non electrical pump) ..but by theory when we are lifting water by using vacuum and atmospheric pressure the weight of water after rising 10.3 m is equal to the atmospheric pressure created by vacuum ,so they cancel out..so is it impossible to lift water using...
  28. Ravi Singh choudhary

    How to lift water up to 5 metres without using a pump?

    I was asked how you can lift the water up to 5 meter but you are not allowed to use any kind of pump. What I thought; seal the container from where water is being lifted. Connect it with a pressure vessel at some height which is containing steam and water with valve in between them. By default...
  29. R

    Can drag force and lift force be in the same direction here:

    In the attached picture, can I say that there is a lift force in the Y-direction, and a drag force too in the same Y-direction? FL proportional to V_fx2 ? FD proportional to V_py2 ? Is this equation of motion for the Y-direction correct here: ma = − mg − FD + V(rho)g + FL The lift force is...
  30. OrangeDog

    What is the Theoretical Solution for Lift at High Angles of Attack for Airfoils?

    I need a reference for the exact solution for lift at high angles of attack, when an airfoil behaves like a flat plate. I am pretty sure the theoretical solution is CL = 2 sin(α)*cos(α) based on two papers I read on lift through 180 degrees angle of attack, but I can't find in any of my books...
  31. A

    When is Lift on an aerofoil proportional to velocity?,

    Hello, I was doing my physics coursework, and blew a hairdryer at my makeshift aerofoil across distances of about 10cm and wind velocities of 8-11 m/s, then measured the lift off of a balance. I found they were proportional, exactly (!?), after doing some research I found drag is proportional...
  32. T

    How Many Times Can the Piston Operate Per Air Bottle in a Pneumatic Lift System?

    Homework Statement A pneumatic lift system is being demonstrated at a sales show. The total load is 70 kg, and the lift piston is 15.2 cm in diameter and has a 20.2 cm stroke. A portable air bottle with an initial pressure of 20 MPa and a temperature of 23 Celsius degrees is to be used as the...
  33. I

    Calculating Wing Lift with a DIY Scale and Air Supply

    Hi! I have attached a small sheet of wood to a stand and then all of it to a scale. After that with a air supply I've made wind go through the "wing". Due to lift, the scale showed up a negative value. Knowing that value, is it possible to calculate the lift of the wing? Thank you
  34. dgd87

    Rotative Gas Lift Flow Rate

    Hi Everyone, I work with rotative gas lift systems, sizing the compressors (recip´s), I'm not that familiar with the oil well, though. I have a doubt regarding the gas flow going to the well. There is a new well which currently produces 0.4 MMscfd of gas and the client wants the system to be...
  35. P

    Maximizing Lift Through Vortex Generation on Airplanes

    For an airplane, their are multiple types of lift, camber, angle of attack, pressure difference, and vortex lift. I understand that at the end of wings the low pressure at the top, and high pressure on the bottom causes their to be a vortex formed. My question is, how exactly do they use that...
  36. P

    Lift vs Thrust Force: How Is More Lift Than Thrust Possible?

    The thrust of an airplane changes the speed of the airplane, or you can look at it as it is increasing the airspeed relative to the airplane. The airspeed across the wings is only as much as the thrust allows it to be. The airspeed across the wing is what produces thrust, and I realize how it...
  37. David Mast

    Wheelchair lift concepts for Travel Trailer

    Hello all, i recently purchased a travel trailer, and i want to create a lift to get inside it. a little background on me, i was in a motocross accident, broke my back and am now paralyzed. I currently work at a full fabrication shop as a mechanical drafter, we have the capabilities to make...
  38. U

    Current required to lift a wire in a magnetic field

    Homework Statement A wire of mass 3.0g and length 60cm is placed on a table parallel to the East-West direction. If a current flows through the wire from West to East, how large must the current be to cause the wire to lift off the surface of the table? (The Earth's magnetic field has strength...
  39. H

    Modeling vehicle lift in uphill front end collision

    Homework Statement This is a video of the phenomenon. Start at 5:08 in this video and watch the next two crashes. That first one, where the car hits a wall, straight on, is the most helpful. The phenomenon is that when a car going uphill crashes, it has an upward speed/momentum vector...
  40. Majorana

    Energy dissipation when a lift stops

    Lifts/elevators of traditional design (i.e. not of the "gearless" type, like Kone's EcoDisc ®) are driven by a hoist that uses a worm drive gear between the electric motor and the sheave. The drum brake is always mounted on the motor shaft (high speed). As you know, worm drive gears are (except...
  41. blainiac

    Can a Bladeless Turbine Create Lift through Rotational Air Drag?

    I was researching Telsa turbines and was intrigued by the bladeless design where gases drag on the discs by means of viscosity and the surface layer adherence. As the discs are rotated by the gas, the gas slows down and exits through the center of the disc. I was wondering if we had two shafts...
  42. C

    Automotive Creating Negative Pressure Underneath Car to Prevent Lift

    Hello, I'm brand new to this site. I have a number of questions that I can't get answered by anybody. I want to some how create negative pressure under the car to suck the bottom of a car down using Vacuum fans (like the 1970 Chaparral 2J Can-Am racing car ("sucker car"). I has some basic...
  43. 5P@N

    Need help understanding a lift coefficient formula

    Please go to this Wikipedia article on Lift Coefficients, and behold the first formula. The last part of the equation has a "S" which is supposed to stand for "relevant plan area". Now, there was no explanation of what this "relevant plan area" is or means. I was guessing that it means the...
  44. henrco

    What rate does the lift accelerates in the first 5 sec?

    Hi, I'm trying to solve this problem and it's driving me a little crazy. Any help greatly appreciated. Q) A lift travels to the top of a tower through a vertical displacement of 48 m. The total journey takes 17 s. The lift accelerates from rest at a constant rate for the first 5 seconds. Then...
  45. physicszilla

    Conical Pendulum with lift and tension

    Homework Statement A model airplane has a small gas powered motor in it to allow it to fly. It is tethered its controller by a long cord. The plane will fly in a circle at the end of this cord around the controller who uses the tether to control the altitude of flight of the plane. Currently...
  46. boneh3ad

    Insights How Does an Airplane Wing Work: a Primer on Lift - Comments

    boneh3ad submitted a new PF Insights post How Does an Airplane Wing Work: a Primer on Lift Continue reading the Original PF Insights Post.
  47. CMW328i

    Suitable metal for flooring in an industrial lift + power

    Hi all, first post here. I'm currently faced with an assignment in a class where we really haven't been taught anything and have to figure it out on our own. We've been asked to design an industrial lift system to raise approximately 3000 kg up 25 stories. I have done a lot of research and...
  48. M

    What happens if i lift a weight on bathroom scales

    If i am standing on bathroom scales and i lift a weight, what will it do to the reading on the scales? I assume that lifting the weight will involve a force from my arm on to the weight, and an equal and opposite force will then push back, causing be to weigh more?
  49. Rewilding

    Power needed to lift the average American man 3 stories

    I'm not a maths person, so bear with me, but I'm trying to prove that with 3.5kW you could lift the average american male (89kg) to a height (take just as displacement) of 3 storeys (about 9.14 meters) in under 3 seconds. Is somebody able to calculate this for me? Thanks!
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