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Topic: Lift (force)

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In the News (Thu 23 May 19)

  What is Lift?
Lift is the force that directly opposes the weight of an airplane and holds the airplane in the air.
Lift is generated by every part of the airplane, but most of the lift on a normal airliner is generated by the wings.
Because lift is a force, it is a vector quantity, having both a magnitude and a direction associated with it.
www.grc.nasa.gov /WWW/K-12/airplane/lift1.html   (511 words)

  Lift Force - Wright 1903 Flyer
Lift is the force that holds an aircraft in the air.
Lift is generated by the difference in velocity between the solid object and the fluid.
For a kite, the lift force is generated by the wind blowing over a surface that is fixed in space.
wright.grc.nasa.gov /airplane/lift1.html   (557 words)

 Wright 1903 Flyer - Forces on an Airplane
A force may be thought of as a push or pull in a specific direction.
This force is called the lift and is generated by the motion of the airplane through the air.
The air resists the motion of the aircraft; this resistance force is called the drag of the airplane.
wright.nasa.gov /airplane/forces.html   (473 words)

 Forces on an Airplane
A force is a vector quantity so a force has both a magnitude and a direction.
Lift is generated by the motion of the airplane through the air and is an aerodynamic force.
Like lift, there are many factors that affect the magnitude of the drag force including the shape of the aircraft, the "stickiness" of the air, and the velocity of the aircraft.
www.lerc.nasa.gov /WWW/K-12/airplane/forces.html   (824 words)

 Rocket Aerodynamic Forces
By convention, the single aerodynamic force is broken into two components: the drag force which is opposed to the direction of motion, and the lift force which acts perpendicular to the direction of motion.
The lift and drag act through the center of pressure which is the average location of the aerodynamic forces on an object.
Aerodynamic forces are not generated by a force field, in the sense of the gravitational field,or an electromagnetic field.
exploration.grc.nasa.gov /education/rocket/rktaero.html   (678 words)

 Lift (force) - Wikipedia, the free encyclopedia
Lift consists of the sum of all the fluid dynamic forces on a body perpendicular to the direction of the external flow approaching that body.
The force acting on the wing is the negative of the time-rate-of-change of the momentum of the air.
Since it is a two-dimensional vector equation, and since lift is perpendicular to drag, this equation suffices to predict both lift and drag.
en.wikipedia.org /wiki/Lift_(force)   (2035 words)

 Handy Lift Professional Shop Products - handy lift, handy motorcycle lift, handy air lift, motorcycle lift, motorcycle ...
Handy® lifts and shop products are a great addition to any shop, garage or race trailer.
Most lifts are manufactured in the USA and feature solid steel construction that ensures years of trouble free use.
Handy's lifts are used by countless motorcycle shops and enthusiasts throughout the country.
www.handy-lift.com   (171 words)

 DiscoverHover Curriculum Guide #4 - Why a Hovercraft hovers: Pressure and Lift
The pressurized air cushion exerts a force on its container (the bottom of the hovercraft, the skirt, and the surface the hovercraft is resting on).
When the force this pressurized air exerts on the surface grows to equal the weight of the hovercraft, it becomes buoyant (like a boat in water) and begins to float on air.
The lift force is therefore the air pressure inside the air cushion multiplied by the area enclosed by the hovercraft skirts.
www.discoverhover.org /infoinstructors/guide4.htm   (753 words)

 The Forces of Aeronautics
This generates a lift force perpendicular to the direction of the airflow.
Another force is needed to get the airplane moving through the air, so that the airflow can do its job of creating lift.
When forces are in balance, that is their strengths are the same and their directions are opposite, the speed and direction of the object will not change.
www.ccds.charlotte.nc.us /mssci/forces_of_aeronautics.htm   (865 words)

 The 4 Forces of Flight
Lift is proportional to the square of the velocity of an airplane and as a plane goes faster, its lift increases.
For instance, as a plane climbs, its weight is equal to a portion of the lift force and a portion of the thrust force.
However, according to Newton's 3rd Law, the force of air pushing on the plane is still equal to the force of the plane pushing through the air.
www.mansfieldct.org /schools/MMS/staff/hand/flight4forcesoverview.htm   (751 words)

 Atkinsopht/Rowing/Oarblade Lift and Drag
ROWING shows that the lift force is constant for an extended period at about 20kgf for the hypothetical foil and 10kgf for the flat plate.
Unfortunately, where it is most wanted, lift has a limited effect owing first to the fact that the shell-longitudinal components of the forces are small at small oarshaft bow angles and second to the fact that the rower's effort at the beginning and end of the stroke is small.
In the early stages of the motion the lift force, which again must at all times balance the rower's effort, is higher (20 kgf) than that for the flat plate (10 kgf).
www.atkinsopht.com /row/liftdrag.htm   (2504 words)

 Centrifugal force
It is the force that counteracts centrifugal force by keeping an object a certain radius from the axis of rotation.
The vertical force is lift produced when the blades assume a positive angle of attack.
The horizontal force is caused by the centrifugal force due to rotation.
www.dynamicflight.com /aerodynamics/centrifugal_force   (531 words)

But, on an airplane's wing, its not that the pressure on the underside is pushing the wing up, its that the low pressure on the topside is so strong that the wing is actually being being pulled up as if you held a small piece of paper in front of a vaccuum cleaner.
There is a limit to how much lift can be generated, however, and angling too much can result, paradoxically, in a drastic drop of net lift force.
Lift is also used by race car designers who have created airfoil-like surfaces to generate "negative lift", or downward-directed force.
wings.avkids.com /Tennis/Book/lift-02.html   (529 words)

The forces on the glider are exactly the same as the forces on an airplane, minus the thrust provided by the engine.
This force is called the lift and is generated by the motion of the glider through the air.
Lift is directed perpendicular to the motion of the glider.
www.nasaexplores.com /show_912_teacher_st.php?id=030307123231   (698 words)

 Drag force versus lift force - TransitionTimes.com Endurance Sports Magazine
To better understand this concept we need to be aware that lift force is generated at a 90 degree angle to the flow of air across the wing or propeller blade.
The drag force is correlated to the inherited "feel of the water", ability of distinguishing the water flow and finding the resistance, while increasing muscular ability will mostly enhance the ratio of moving water backwards without much influence on the speed of the moving body (Leonard).
To maximize the lift force, as soon as it enters the water, the paddle is rotated (like propeller) throughout the underwater stroke.
www.transitiontimes.com /viewstory.cfm?ID=2881   (1643 words)

 Aerospaceweb.org | Ask Us - Wings and Lift
An aircraft in flight is acted upon by four basic forces: weight that pulls the aircraft toward the ground, thrust that pushes the aircraft forward, drag or the force of the air pushing against the motion of the aircraft, and lift that pulls the aircraft up.
The most common explanation of the concept of lift is based upon the Bernoulli equation, an equation that relates the pressures and velocites acting along the surface of a wing.
Therefore, we must conclude from Newton's third law that the force accelerating the air downward must be accompanied by an equal and opposite force pushing the airfoil upward.
www.aerospaceweb.org /question/aerodynamics/q0005.shtml   (1260 words)

 Local Lift -- September 1998
The Air Force's theater airlift force dedicates much of its capability to the Army, which needs the airplanes to move soldiers or drop paratroops and to haul lighter vehicles and all the gear and consumables necessary for quick movement in the war zone.
The C-17 Globemaster III played an important intratheater lift role in Bosnia where, early in the Army deployment in late 1995, it was able to move outsize equipment rapidly to small airfields.
The Air Force was not yet ready to start replacing its C-130s, but it agreed to request two examples of the new airplane per year to "get the ball rolling," a senior Air Force official said.
www.afa.org /magazine/Sept1998/0998lift.asp   (2887 words)

 Lift Force -- from Eric Weisstein's World of Physics
A force produced perpendicular to the flow of a fluid.
It is predicted by Bernoulli's law for any obstacle which compresses streamlines at one boundary and compresses them on the opposite one, resulting in a difference in pressures which causes the lift force
is the lift coefficient, A is the area of wing, and
scienceworld.wolfram.com /physics/LiftForce.html   (74 words)

 :: NASA Quest > Aerospace ::   (Site not responding. Last check: 2007-10-30)
When those objects lift off the ground it means that the lift force is stronger than the weight force.
Since the weight force of an airplane is so great, the airplane needs to be able to generate a lot of lift.
Such a great lift force is generated by the air flowing over the wings of the airplane.
quest.arc.nasa.gov /aero/planetary/atmospheric/forces.html   (962 words)

 Forces in Flight
The magnitude of the force depends on the mass of all the aircraft parts.
This force is obtained by the motion of the aircraft through the air.
Lift force is therefore dependent on the density of the air
sky.prohosting.com /air2/index4.htm   (970 words)

 lift - Search Results - MSN Encarta
Lift, force perpendicular to relative wind flow and opposite the force of gravity that affects aircraft and other devices.
Movable bridges make up a class of bridge in which a portion of the bridge moves up or swings out to provide additional clearance beneath the bridge....
balcony, ceiling, chimney, colonnade, cupola, doorway, elevator, escalator, fa├žade, fire escape, frontage, gable, guttering, landing, lift,...
encarta.msn.com /encnet/refpages/search.aspx?q=lift   (154 words)

 Aerodynamic Lift, Bernoulli Effect, Reaction Lift
That is described as an unstable lifting effect, and that is the normal situation with Reaction Lift.
The Bernoulli Lift for practical aircraft wings does not produce such great amounts of lift, but that phenomenon is naturally stable (therefore far safer) because the amount of Bernoulli Lift created is fairly constant for various wing angles.
Reaction Lift is the effect of the pressure of moving fluid (air, in this case) against the bottom of a tilted surface.
mb-soft.com /public2/lift.html   (4571 words)

 Lift-induced drag - Wikipedia, the free encyclopedia
In aerodynamics, lift-induced drag, or induced drag, is a drag force which occurs whenever a lifting body or a wing of finite span generates lift.
That parallel to the incident airflow is the drag and that normal to the incident airflow is the lift.
The lift distribution may also be modified by the use of washout, a spanwise twist of the wing to reduce the incidence towards the wingtips, and by changing the airfoil section near the wingtips.
en.wikipedia.org /wiki/Lift-induced_drag   (794 words)

 The Science House - Flight
In this lab, you will measure the lift force on a sphere (beach ball) for various air velocities and determine the relationship between the two.
The two forces you will use are 0 N (no force) and the weight of weight of a 0.5 kg mass: W = mass x 9.8 m/s2 when the mass is in kilograms.
The two forces you will use are 0 N (no force) and the weight of a 0.5 kg mass: W = mass x 9.8 m/s2 when the mass is in kilograms.
www.science-house.org /student/bw/flight/lift.html   (715 words)

 Spanwise Lift force distribution?
2.Lift force at the root is PI/4 greater than mean and as local chord is a constant, lift force falls away in the same eliptical relationship as Cl toward the tip.
As local lift force is a product of Cl and local chord and Cl is constant, the lift force distribution follows the same eliptical relationship as the chord.
Rather the graphs for various wing plan forms all strongly suggest that the distribution of lift force along the span is eliptical or at least as near as can be determined from the graphs.
www.physicsforums.com /showthread.php?t=14172   (508 words)

 Lift Mates Box Handling Devices and Box Grips
The ability to lift boxes properly is greatly enhanced allowing the legs to do the lifting.
The box is lifted more quickly, and held closer to the body saving time and effort.
All graphics, logos, slogans and etc used on this website are the property of Quality Trading Inc. or being used with the expressed written permission of the respective owners and may not be used, copied, edited or reproduced without the expressed written permission from Quality Trading, Inc. and the respective owners.
www.boxgrip.com   (417 words)

 Measurements of Shear Lift Force on a Bubble in Channel Flow in Microgravity   (Site not responding. Last check: 2007-10-30)
Under microgravity conditions, the shear lift force acting on bubbles, droplets or solid particles in multiphase flows becomes important because under normal gravity, this hydrodynamic force is masked by buoyancy.
This force plays an important role in furnishing the detachment process of bubbles in a setting where a bubble suspension is needed in microgravity.
The shear lift force is deduced from the bubble kinematics using scaling and then compared with predictions from models in literature that address different asymptotic and numerical solutions.
gltrs.grc.nasa.gov /cgi-bin/GLTRS/browse.pl?2003/TM-2003-212113.html   (316 words)

 College Park Aviation Museum: Fun with Aviation: How Things Fly   (Site not responding. Last check: 2007-10-30)
A basic knowledge of the forces that act upon an airplane and of the parts of an airplane will enhance your appreciation of the advances made during the years that the College Park Airport has operated.
The magnitude of the force depends on the mass of all the airplane parts, plus the amount of fuel, plus any payload on board (people, baggage, freight, etc.).
To overcome drag, most airplanes have some kind of propulsion system to generate a force called thrust.
www.pgparks.com /places/historic/cpam/5how.html   (529 words)

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