Why speed is required to stay in air?

  • Thread starter krima
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In summary, when an airplane moves forward, its wings generate lift. As long as lift is greater than gravity, the plane can climb or maintain constant height. However, if the plane goes too slow, it can reach the stall speed where the wings can no longer produce enough lift and the plane could potentially drop out of the sky. This is why airplanes do not fall down perpendicularly.
  • #1
krima
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i want to say that when an aeroplane goes with highspeed,why the perpendicular gravitanional force is not acting on it and why does aeroplane dose not fall down perpendicularly? pleasezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz reply 2 question as soon as possible...:confused:
 
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  • #2
Gravity still acts on planes, but the air exerts an upward force on the plane that counters it. In a nutshell, the moving plane deflects air downward which creates an upward force on the plane.
 
  • #3
Gravity acts on airplanes just as much as on anything else. However, the airplanes move fast enough that the forces on the airplane from the air are strong enough to balance out the gravity force.

Oh, and speed isn't required to stay in the air:
http://upload.wikimedia.org/wikipedia/commons/5/5b/Md500n.g-smac.arp.jpg
 
  • #4
@doc can u explain it in more details..pleasez...
 
  • #5
i also want to know dat wat is stall speed?
 
  • #7
When an aircraft moves forward its wings generate lift.

When lift > gravity the aircraft climbs, when lift < gravity the aircraft descends and when lift = gravity it flies at constant height.
krima said:
i also want to know dat wat is stall speed?

Please use proper English in your posts. Text speak isn't acceptable.

The stall speed is when the aircraft goes too slow and the wings no longer produce enough lift to maintain flight. If this point is reached, the aircraft could quite literally drop out of the sky.

That's about as simple as I can make it.
 
  • #8
heyyy thanks everyone for explaning me...
 

1. Why does an airplane need to maintain a certain speed to stay in the air?

The speed of an airplane is directly related to the lift it generates. In order to stay in the air, an airplane needs enough lift to counteract the force of gravity. This lift is created by the movement of air over the wings, and the speed of the airplane determines the amount of lift generated.

2. How does airspeed affect the amount of lift an airplane can generate?

The faster an airplane moves through the air, the more lift it can generate. This is because at higher speeds, the air flowing over the wings creates a lower pressure area above the wing, which helps to lift the airplane. If an airplane slows down too much, it will not generate enough lift to stay in the air.

3. Can an airplane stay in the air without a certain speed?

No, an airplane cannot stay in the air without a certain speed. As mentioned before, the speed of the airplane is crucial in generating enough lift to counteract the force of gravity. If an airplane were to slow down too much, it would eventually lose all lift and begin to descend towards the ground.

4. Is there a specific speed that all airplanes must maintain in order to stay in the air?

No, the speed required to stay in the air varies depending on the type of airplane, its size, and the atmospheric conditions. However, all airplanes have a minimum speed called the stall speed, below which they cannot generate enough lift to stay in the air. This speed is determined by the design of the airplane and is usually indicated on the airspeed indicator in the cockpit.

5. How does air density affect the speed required to stay in the air?

Air density plays a significant role in determining the speed required to stay in the air. In thinner air, such as at higher altitudes, an airplane needs to maintain a higher speed to generate enough lift. This is because the air molecules are more spread out, resulting in less lift being created. On the other hand, in denser air, such as at lower altitudes, an airplane can fly at a slower speed and still generate enough lift to stay in the air.

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