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Bernoulli’s Principle

Bernoulli’s Principle. Created by: Keith P. Murphy Winston Churchill High School Potomac, MD. Bernoulli’s Principle:. A Swiss scientist born in 1700’s that is most famous for his work in fluid pressure. Remember!!!. Air is a gas and a fluid

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Bernoulli’s Principle

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  1. Bernoulli’s Principle Created by: Keith P. Murphy Winston Churchill High School Potomac, MD

  2. Bernoulli’s Principle: • A Swiss scientist born in 1700’s that is most famous for his work in fluid pressure.

  3. Remember!!! • Air is a gas and a fluid • Air pressure is due to the motion of its particles • ex. The quicker a stream of particles travel, the ???????

  4. Bernoulli’s Principle • Pressure in a moving stream exerts less pressure than the air surrounding the moving stream Quick stream = low air pressure Slow stream = High air pressure

  5. In your notes, hypothesize why the tennis ball ‘stands’ in the air. Draw the air currents. Standing Tennis Ball Penn AIR FLOW

  6. The Answer The tennis ball is surrounded by an air stream of equal speed, thus equal pressure. The down force is ‘G.’ Thus, the ball stands on air. The air pressure below is equal with the ‘G’ force. ‘G’ AIR FLOW

  7. Bernoulli & Flight • Bernoulli’s Principle is what allows birds and planes to fly. • The secret behind flight is ‘under the wings.’

  8. The air on top of the wing must travel a longer • distance than the air below the wing. But, air on • both sides must reach the end of the wing at the • same time. Therefore, the air on top of the wing • traveling faster = less air pressure. Creates Lift AIR

  9. Below is a NASA illustration of what surface pressure is exerted on what surface areas of the wing. Is this plane ascending or descending?

  10. This diagram shows regions of air pressure around specific areas of the wing. Again, notice that the low pressure region is above the wing, allowing for upward thrust.

  11. LIFT THRUST DRAG GRAVITY

  12. The engines provide THRUST. • The wings provide LIFT. • Gravity provides the ‘G force.’ • And, fluid friction provides the • DRAG. • What is happening • if the airplane is • flying at constant • altitude? What forces are =?

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