So far, we have looked at fluids and we have seen that fluids exist as both
liquid and as air.
FLUIDS
We have also seen how a fluid passes around an object.
Bernoulli noticed that pressure exists all around us. In fact, he found that
stationary fluids such as air and water exert pressure in
all directions.
BERNOULLI’S PRINCIPLE
Now, we are going to look at the force of LIFT and see
how it applies to flying objects such as airplanes.
The air flowing over the curved top of the wing has further to go than the air
going under the flat bottom of the wing.
The air flowing over the curved top of the wing has further to go than the air
going under the flat bottom of the wing.
The air flowing over the curved top of the wing has further to go than the air
going under the flat bottom of the wing.
The air flowing over the curved top of the wing has further to go than the air
going under the flat bottom of the wing.
The air flowing over the curved top of the wing has further to go than the air
going under the flat bottom of the wing.
The air flowing over the curved top of the wing has further to go than the air
going under the flat bottom of the wing.
The air flowing over the curved top of the wing has further to go than the air
going under the flat bottom of the wing.
The air flowing over the curved top of the wing has further to go than the air
going under the flat bottom of the wing.
The air flowing over the curved top of the wing has further to go than the air
going under the flat bottom of the wing.
The air flowing over the curved top of the wing has further to go than the air
going under the flat bottom of the wing.
The air flowing over the curved top of the wing has further to go than the air
going under the flat bottom of the wing.
The air flowing over the curved top of the wing has further to go than the air
going under the flat bottom of the wing.
The air flowing over the curved top of the wing has further to go than the air
going under the flat bottom of the wing.
The air flowing over the curved top of the wing has further to go than the air
going under the flat bottom of the wing.
The air flowing over the curved top of the wing has further to go than the air
going under the flat bottom of the wing.
Predict: How will both air molecules arrive at the tail of the wing at the
same time if the molecule on top has a farther distance to travel?
For the two streams of air to reach the back of the wing at the same time, the top stream must travel faster than the bottom. (It has a farther distance to
go.)
For the two streams of air to reach the back of the wing at the same time, the top stream must travel faster than the
bottom. (It has a farther distance to go.)
For the two streams of air to reach the back of the wing at the same time, the top stream must travel faster than the
bottom. (It has a farther distance to go.)
This fast moving air creates a low pressure area on the top of the wing
and a high pressure area on the bottom of the wing. (Bernoulli’s
Principle)
LOW PRESSURE
HIGH PRESSURE
Air will move from a high pressure zone to low pressure zone. As it pushes against the wing, lift is
created.
LOW PRESSURE
HIGH PRESSURE