What is Bernoulli’s principle?

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Presentation transcript:

What is Bernoulli’s principle? Section 2-9

Bernoulli’s Principle Principle that states that as the speed of a fluid increases, its pressure decreases.

Demonstration Take a piece of paper and hold in front of you. Blow over the top of the paper. What happens to the sheet of paper?

There are 3 forces combined that allow an airplane to fly. Lift Thrust Drag

Upward force in flight. In normal flight, lift equals weight of plane.

Thrust The forward force on the plane. Normal flow of air over wings will not allow a plane to have enough lift to take off. Plane must reach a certain speed and create enough air flow around wings to fly. This is done by THRUST of the engine.

Drag The flow of air over the wings is a form of air resistance which is a frictional force. Too much drag creates greater usage of fuel. The process of reducing drag is streamlining.

H.W. p. 37 Check/apply 1-8 Wkst. 2-9

Chapter Review Unit 2 tech term review pgs Chapter Review Unit 2 tech term review pgs. 38-40 Matching, Fill in, Multiple choice, T/F, Reading critically, Critical thinking