Bernoullis Principle

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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

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
• Air pressure is due to the motion of its particles
• ex. The quicker a stream of particles travel, the ???????
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

Draw the air currents.

Standing Tennis Ball

Penn

AIR FLOW

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

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

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

Below is a NASA illustration of what

surface pressure is exerted on what

surface areas of the wing. Is this

plane ascending or descending?

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.

LIFT

THRUST

DRAG

GRAVITY

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 =?