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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.
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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. |
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