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THEORIES OF PRODUCING LIFT


Newton’s Laws

Sir Isaac Newton formulated the law of universal gravitation and three basic laws of motion.

  • Newton’s First Law of motion –an object at rest will remain at rest unless a force strong enough to overcome it.

  • Second Law – “Force is equal to the change in momentum per change in time. For a constant mass, force equals mass times acceleration.” Simply put, a force applied to an object at rest, will cause the object to accelerate in the same direction of that force.

  • Third Law – “For every action, there is an equal and opposite reaction.”


Bernoulli’s Principle

Bernoulli’s Principle states that the velocity of a fluid increases, the pressure within that fluid decreases. With that said, Bernoulli’s Principle explains what happens to fluid (air) when it passes over the curved top of an aircraft wing.

Bernoulli’s Principle is applied to a venture tube. The tube has large inlet that narrows to a constricted point and returns back to a larger outlet.


For air to pass through the tube, the mass of air entering must equal the mass of air exiting. When the passes through the constricted point, the air must increase in speed to allow the same amount of to pass through.

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