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Accelerating objects - aeroplane take off

Accelerating objects - aeroplane take off

Objective:

In this experiment the objective is to study the motion of an airplane measuring its acceleration. Since it is hard to perform this experiment nowadays, we will use data taken previous to September 11th 2001. The aircraft was a Boeing 737 and data was collected during takeoff from Stockholm-Arlanda. The probe was an accelerometer connected to a CBL and a TI83. Collected data was stored in the graphing calculator and can now be analysed either with the calculator or a computer, using previously collected data.

Daniel Bernoulli, an eighteenth-century Swiss scientist, discovered that as the velocity of a fluid increases, its pressure decreases. How and why does this work, and what does it have to do with aircraft in flight? Bernoulli's principle works with an airplane wing. In motion, air hits the leading edge (front edge) of the wing. Some of the air moves under the wing, and some of it goes over the top. The air moving over the top of the curved wing must travel farther to reach the back of the wing; consequently it must travel faster than the air moving under the wing, to reach the trailing edge (back edge) at the same time. Therefore the air pressure on the top of the wing is less than that on the bottom of the wing. This combination of pressure decrease above the airfoil and increase below the airfoil produces lift.

Materials:

Stored data and a TI-83 or a PC with Excel


[  Data acquisition |  Data analysis (TI83)  |  Data analysis (MSExcel)  |  PDF version of the module  |  Evaluation form  |  Back to Experiments  ]



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