if the drag of an airplane is equal to the thrust of the power plane what makes airplane go forward??
491132
drag and thrust are not equal, thrust outpowers drag
338219
the resistive force that air will exert upon an object moving through it at a given velocity.\n\nthe equation is Drag= 1/2 cpav2 (squared)\n\nc is a constant.\np is the density of the fluid (air in this case)\na is the cross sectional area of the object\nv is the velocity of the object.
179408
Bernoulli principle is only partially true for a airplane.\n \nThe main reason for airplane creating lift is when an airstream passes by something which deflects it downward. The force created by this deflection of the air creates an equal and opposite force upward on the wing according to Newton's third law of motion. The deflection of airflow downward during the creation of lift is known as downwash.\n\nA false explanation for lift is known as the "equal transit-time" explanation, it states that the parcels of air which are divided by an airfoil must rejoin again; because of the greater curvature (and hence longer path) of the upper surface of an aerofoil, the air going over the top must go faster in order to "catch up" with the air flowing around the bottom. Therefore, because of its higher speed the pressure of the air above the airfoil must be lower. Despite the fact that this "explanation" is probably the most common of all, it is false.
463967
The first answer gives ground speed.\n\nAir speed is measured by a differenctial pressure arrangement, in which the air pressure on the leading edge of a wing is compared with the "static" pressure (a reading which is shielded from the effect of the aircraft's movement through the air.)
25793
Because of the jet stream.  The jet stream flows west to east.  When a plane is flying east to west, the is more wind resistance on it.
677923
Drag is the force of the air which interferes with the speed of the plane
58016
The thrust is irrelevant. This is a conservation of angular momentum problem so all you need is the momentum of the planes. When calculating the angular momentum of the earth, you need to multiply by a factor of 2/5 to make up for the fact that the earth is solid and not all of the mass is at the surface.\n\nyou can do the math yourself.
555677
You are using the term "power" incorrectly. Power is the rate of production of energy. A jet may have enough energy, but it does not have enough power. A fully fueled jet may be able to burn all it's fuel with oxygen from the surrounding atmosphere to generate enough energy to make it to orbit, but it takes many hours to do that, and all the time it is being slowed by friction with the atmosphere. The shuttle burns all it's fuel in 10 minutes, and it carries it's own oxygen in a tank so it can operate outside the atmosphere. So even though they may have similar energy, the shuttle has far more power.
1077367
An aircraft flies due to aerodynamic reactions that happen when there is relative motion between air and a wing.\n\nIf a cross-section of a typical aircraft wing is viewed, the top of the wing can be seen to be curved downwards, while the bottom of the wing is less curved or straight, but angled to the airflow. This shape, called an airfoil or aerofoil, creates lift when it travels through the air. However, this optimisation is not applicable for aerobatic aircraft, which need to fly inverted, or for supersonic aircraft.\n\nLift is created as an airstream passes by something which deflects it. The force created by this deflection of the air creates an equal and opposite force on the wing according to Newton's third law of motion. The deflection of airflow downward during the creation of lift is known as downwash.\n\nNearly any shape will produce lift if curved or tilted with respect to the air flow direction. However, most shapes will be very inefficient and create too much drag. One of the primary goals of wing design is to devise a shape that produces the most lift while producing the least lift-induced drag.
1004891
Nope...force is what you are looking to determine.  Force equals mass x acceleration.  The fly would have to travel MUCH faster to have any impact on the train.  Also, the fly, once it made initial contact with the train, doesn't decelerate all at once...parts of it continue moving after other parts stop, and some parts start moving in East and West directions...SPLAT!
899952
If you throw a ball across the room, it will stop accelerating as it leaves your hand.\n\nThe whole ball (including anything inside it) will carry on travelling according to the force you applied, but its direction will be altered by gravity (which is still pulling it downwards).\n\nThe shape it's flight makes is called a 'parabola', and this same shape happens whenever gravity stops an object from travelling upwards (even a purely vertical thrust will lead to some sideways movement; this is called 'Coriolis effect'), and makes it travel downwards instead.\n\nBecause the outside of the object is always travelling in the same direction as the objects inside it, they don't press on each other (their relative 'G' is zero). Because 'weight' is actually just relative pressure, the objects will seem weightless.\n\nThe American and Soviet 'vomit comets' are large transport aeroplanes with strengthened wing roots and a padded interior.\n\nThe pilot will first initiate a steep dive, and pull up out of this as if he is going to 'loop the loop'. Pulling up from a dive like this will press the passengers against the floor, so they seem heavier than normal; typically 3-4 times their normal weight (3-4G).\n\nAs the plane comes up from the dive, this extra 'G' will decrease, until it reaches zero, and the passengers feel 'weightless'. \n\nAt that point, the aeroplane is travelling upwards under the momentum of its own weight, like a roller coaster. If the pilot kept the engines accelerating, they would drive the plane upwards and press against the passengers, but by cutting the engines, the plane is left to rise like a thrown ball. It travels in a parabolic curve, but the passengers don't (they tend to bounce around in zigzags, perform somersaults for the camera, lose their sense of direction and start puking)\n\nAbout 40 seconds of weightlessness can be simulated in this way, because that's how long it takes for the plane to stop rising, and return to its downward dive speed. If it was left to dive for too long, pulling out of the dive would rip the wings off.\n\n(if that happened, the passengers would experience weightlessness (or very nearly; air resistance would slow the plane, but not them) all the way to the ground, but they wouldn't be able to tell us about it afterwards)
1031881
As an aircraft moves through the air, the wing is inclined to the flight direction at some angle. The angle between the chord line of the airfoil and the flight direction is called the angle of attack. Angle of attack has a large effect on the lift generated by a wing. During takes off, the pilot applies as much thrust as possible to make the airplane roll along launch rail. But just before lifting off, the pilot "rotates" the aircraft. The nose of the airplane rises, increasing the angle of attack and producing the increased lift needed for takeoff.\n\nThe amount of lift generated by a wing depends on how much the flow is turned, which depends on the shape of the object. The lift is, in general, a very complex function of the shape.the greater the air flow turning, the greater the lift.\nIt is important to note that the acceleration of the air does not just involve the air molecules "bouncing off" the lower surface of the wing. Rather, air molecules closely follow both the top and bottom surfaces, and so the airflow is deflected downward. The acceleration of the air during the creation of lift has also been described as a "turning" of the airflow.\nWhen the air is bent around the top of the wing, it pulls on the air above it accelerating that air down, otherwise there would be voids in the air left above the wing. Air is pulled from above to prevent voids. This pulling causes the pressure to become lower above the wing. It is the acceleration of the air above the wing in the downward direction that gives lift.\n\n\nThe amount of lift generated by an object depends on the size of the object. Lift is an aerodynamic force and therefore depends on the pressure variation of the air around the body as it moves through the air. The total aerodynamic force is equal to the pressure times the surface area around the body. Lift is the component of this force perpendicular to the flight direction. Like the other aerodynamic force, drag, the lift is directly proportional to the area of the object. Doubling the area doubles the lift.\n\n\nThe greater the angle of attack, the greater the vertical velocity. Likewise, for the same angle of attack, the greater the speed of the wing the greater the vertical velocity. Both the increase in the speed and the increase of the angle of attack increase the length of the vertical arrow. It is this vertical velocity that gives the wing lift.
34167
Ur... I thought the question was HOW, not "WHY":\n\nYou draw arrows for each force.  They start from a point, an go in the direction of the force.  You draw them to scale so they are proptionately long for the different forces.\n\nSay you have a boat doing 20 mph due west, against a current 10 mph due north.  Where will the boat end up in 1 hour?\n\nScale:  1" = 10 mph\n\nDraw a line to the left (West) 2" for 20 mph\nDraw a line up from the same starting point, 1".\n\nTo find the end point, draw paralleles so that it makes  four-sided figure.  A line draw from you origin to the point across the diagram will tell you  the resultant force (from length of the line) and the bearing or direction it will go.\n\n(Its easier when you draw it, believe me)
257523
Lift, thrust, gravity, drag.
38489
On an airplanes wing, the top is curved in shape, and the bottom is straight.  When the plane gains speed, the air will be forced to move faster over the curved portion.  The faster moving air applies less pressure than over the straight portion therefore creating "lift"
193979
Airplane wings use a combination of Bernoulli's principle (the faster air flows over a surface the lower its pressure) and "Reaction" or Newtonian lift, the force produced by the downward acceleration of an air mass by a plane surface that is tilted with respect to the velocity. (See 1st & 2nd references). The upper surface of the wing is curved and the lower surface is relatively straight. Thus air passing over the wing has farther to travel before it rejoins the air that went under the wing, and must move faster. The lower pressure over the wing creates a Bernoulli lift force. The wing also has a positive "angle of attack" (basically the tilt angle of the wing's lower surface) producing Newtonian lift. Ref. 1 estimates that airliners have more Newtonian than Bernoullian lift. The wing transfers the sum of these lift forces to the airplane. And of course the thrust needed to reach the speed necessary for the wings to provide adequate lift comes from a motor-driven propellor or a jet engine. \nBirds, having movable wings, fly in two basic modes, gliding and flapping. These modes also use a mix of Bernoulli's principle and Newtonian momentum exchange to achieve lift. When gliding, the curved wing surface operates similarly to that of an airplane. More momentum exchange occurs when the wings are flapped; each downstroke pushes air downward and backward which provides an upward and forward force to the wing and through the wing to the bird's body. Feathers play a vital and mechanically complex role in flight, especially in flapping. The 3rd reference discusses this in some detail. I can't put pictures in this answer but the 4th reference provides a diagram of gliding lift, and you can find much more by googling "aerodynamic lift birds".
416972
As the plane's engines provide thrust, there is a certain amount of force countering it in the form of drag.  So if the thrust from the engines were to drop off, the drag force would be greater than the forward force.  (Eventually, the drag force will also be reduced so that the two opposing forces will be in balance again.)  Because of this, the plane will immediately start to decelerate.