1. What are Some Characteristic of Fluid Pressure ? Day 1

2. Depth effects pressure
As depth increases, water pressure increases (directly proportional) Depth Pressure

3. Altitude effects Pressure
As altitude increase, air pressure decreases (inversely proportional) Altitude Pressure

4. Atmospheric Pressure
The atmosphere is a fluid: a thin layer of nitrogen, oxygen, and other gases that surrounds Earth.
Atmospheric pressure is the pressure caused by the weight of the atmosphere.
Atmospheric pressure is exerted
on everything on Earth….
including you!

5. Are you under a lot of pressure? Do you feel a lot of pressure?
Right now, 1000 kg of air are pushing on the top of your head!

6. What is a Force? Any push or pull (unit: Newton or N)
Weight is a Force (W = m x gravity)

7. What is pressure? The result of a force distributed over an area
Pressure = force = Newton
area meters2
SI unit of pressure is the pascal (Pa)
1 Pa = 1 Newton/1m2

8. Juice Falls

9. Or feeling a bit stressed lately???
FLUID PRESSURE Day 2
Or feeling a bit stressed lately???

10. What is pressure? The result of a force distributed over an area
Pressure = force = Newton
area meters2
SI unit of pressure is the pascal (Pa)
1 Pa = 1 Newton/1m2

11. For example: Sharp Knife vs Dull Knife
Sharp knife exerts a LARGE FORCE over a small area
FORCE/ area = PRESSURE
Dull knife exerts a small force over a LARGE AREA
Force/AREA = pressure

12. You do the math Sharp knife: area = 1 mm2 Dull knife: area = 5 mm2
Force applied to each knife = 5 N
Sharp knife = 5/1 = 5N/m2
Dull knife = 5/5 = 1N/m2

13. Ice skating (or roller blading)
Another example:
Ice skating (or roller blading)
A shoe distributes the force (body weight) over a much larger area than the skate
So the skate exerts a much higher pressure on the ice than the shoe does
The skate pushes into the ice and
Voila! You can skate!

14. Examples
If the area of a box touching the ground is 1.5 square meters, and its weight is 2700 newtons, what pressure does the box exert on the ground?
A gymnast standing on one hand (area 0.02 m2) pushes down on the ground with a force of 600 N. How much pressure does the gymnast exert on the ground?

15. So . ……..
The greater the area the force is distributed over, the less the pressure

16. Day 3- Fluids Flow

17. So What are Fluids?
A substance that can flow and takes the shape of it’s container (no definite shape)
Examples: gases and liquids
Fluids exert pressure

18. Fluids want to . . .
Move from areas of high pressure to areas of low pressure
Everything wants to be equal

19. Pressure Differences and Fluid Flow
Just by drinking through a straw you can observe an important property of fluids: Fluids flow from areas of high pressure to areas of low pressure.

20. Pressure Differences and Tornadoes
The air pressure inside a tornado is very low. Because the air pressure outside of the tornado is higher than the pressure inside, air rushes into the tornado.
The rushing air causes the tornado to be like a giant vacuum cleaner.

21. PRESSURE!!! Can Crusher

22. Standard atmospheric pressure = 14.7 pounds per square inch (psi)
What happened to this can?

23. Everything wants to be equal!
Pressure on the outside >>>> pressure on the inside
So when the can is heated, the can is crushed!
Why?????