Science of Flight: Air Pressure/Bernoulli Effect

Experiment 4

Air Pressure

 What are we investigating?

What is Air Pressure?

How can we see it if it’s invisible?

What did we do?

We took a full milk carton, stuck the straw in and drank all the milk.

We then kept sucking until the sides of the carton began to collapse inwards.

What did we find out?

At the start the air pressure inside and outside the carton was equal.

When we sucked out the air from inside the carton the air pressure outside was greater and so it pushed in the sides of the carton.

Even though we couldn’t see it we knew it was there!

air P 1 photo 2 (1)

Experiment 5

Aerofoils

What are we investigating?

How can we use air pressure to counteract gravity?

How does the design of an airfoil create lift?

What did we do?

We took a strip of paper and held it flat with one end drooping down.

Using our  breath we had to try to create lift on the drooping end.

tiff infomation

tiff infomation

tiff infomation

tiff infomation

What did we find out?

If we blow under the tip of the wing we can make it lift.

If we blow across the top of it we can make it lift also.

This is because of the Bernoulli Principle, which is that when the air moves faster across top of the wing the air pressure decreases and so the pressure underneath becomes greater causing the wing to be pushed up giving lift.