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# Good Afternoon!

Good Afternoon!. Today’s Starter Question: Why do roofs lift off of houses in a tornado? Today we will be Passing back papers and looking at the gradesheet. working on a lab titled Bernoulli’s Lab Then we will move on to an explanation and Demonstration of this Principle.

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## Good Afternoon!

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### Presentation Transcript

1. Good Afternoon! • Today’s Starter Question: • Why do roofs lift off of houses in a tornado? • Today we will be • Passing back papers and looking at the gradesheet. • working on a lab titled Bernoulli’s Lab • Then we will move on to an explanation and Demonstration of this Principle.

2. Bernoulli’s Principle • We will be splitting the class into two groups • One will be doing a lab in the back the other going through a powerpoint explaining what Bernoulli’s principle is.

3. What happens to pressure when air moves? • The pressure goes down

4. Why does this happen? • Air molecules are what cause air pressure so if you move them out of the way you decrease the pressure.

5. Now a little demo • Why does the ball stay in the air? • The air above it is moving and therefore you have a low pressure above and a high pressure below that will support the weight.

6. What could happen to a window if there were high speed winds moving on only one side? • The higher pressure could cause it to fall out

7. How do airplanes fly? • What does the book say? • The shape of the wing causes low pressure on top

8. Here is what you often see

9. Is there another possibility? • Some say the angle of the wing pushes air flow down and the wing up, and the shape of the wing causes low pressure on top

10. The truth • The truth is that the shape of a wing wouldn’t provide enough force to lift a plane, neither would the force of the wing angle deflecting air down. • They both work to lift the plane

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