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SVTPerformance's Chain of Restaurants
Road Side Pub
The Treadmill & Airplane debate solved & Explained
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<blockquote data-quote="Outlaw99" data-source="post: 16889927" data-attributes="member: 6069"><p>an airplane is stationary, and not moving until thrust is applied. Its on the ground. In this question, its on a treadmill. The treadmill is the runway. If an airplane is not moving, sitting on a treadmill for a runway, it will not fly until thrust is applied. The trick to the question is, if the plane, while on the ground starts moving forward, at the same speed a treadmill begins moving backwards underneath of it, no the plane does not fly. It remains stationary. Its not accelerating because the ground, aka the runway, aka the treadmill is moving at the same speed against the thrust of the planes ability to move forward. A plane must move forward, to generate speed to generate air to pass over the airfoil to produce lift. An airplane, simply by its nature as an airplane does not fly, until all 4 elements are present. With the treadmill as the runway, moving backwards in relation to the airplane accelerating, you only have 3 of the 4 forces applied. Thrust and drag and weight. The Drag is greater then Thrust, in this trick question, in fact its producing negative effects, which means lift will not be present.</p><p></p><p></p><p>Its a trick question.</p></blockquote><p></p>
[QUOTE="Outlaw99, post: 16889927, member: 6069"] an airplane is stationary, and not moving until thrust is applied. Its on the ground. In this question, its on a treadmill. The treadmill is the runway. If an airplane is not moving, sitting on a treadmill for a runway, it will not fly until thrust is applied. The trick to the question is, if the plane, while on the ground starts moving forward, at the same speed a treadmill begins moving backwards underneath of it, no the plane does not fly. It remains stationary. Its not accelerating because the ground, aka the runway, aka the treadmill is moving at the same speed against the thrust of the planes ability to move forward. A plane must move forward, to generate speed to generate air to pass over the airfoil to produce lift. An airplane, simply by its nature as an airplane does not fly, until all 4 elements are present. With the treadmill as the runway, moving backwards in relation to the airplane accelerating, you only have 3 of the 4 forces applied. Thrust and drag and weight. The Drag is greater then Thrust, in this trick question, in fact its producing negative effects, which means lift will not be present. Its a trick question. [/QUOTE]
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The Treadmill & Airplane debate solved & Explained
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