1. 13.2 Forces and Pressure in Fluids
MONDAY, MARCH 28, REG section 3.2 fluids
OPENER #1 - Periods 3, 4, & 6
1. How can you predict if an object will float in a liquid?
2. Is it possible for liquids to float on liquids? Give an example or counter example.
3. What does the word viscosity mean? (prior knowledge & chapter)
CW: Notes “PAP or REG 3.2” - Fluids, pressure, Bernoulli’s Principle, etc.
QUIZ next Wednesday on the small unit of study...
Your group has until April 8th to have converted your iMovie into a movie and dropped in my IN BOX to not lose any points. You will need to work on this at lunch, before school, or after school in the next couple of weeks.
HW REG: pg. 84 #1 AND pg. 86 #1-9 due TOMORROW. This is the first grade of the 9 weeks. Start out with 100%! (3 incomplete assignments will be write up in my class this 9 weeks. 1 day late may count up to 1/2 credit only in my class; other teachers may not give any.)
FIELD TRIP WEDNESDAY - Others will report to Coach Bock Room in Bldg. 18.

2. 13.2 Forces and Pressure in Fluids
MONDAY, MARCH 28, PAP ch. 13
OPENER #1 PAP - periods 5, & 7 - 5th period has an assembly FIRST
1. How can you predict if an object will float in a liquid?
2. Is it possible for liquids to float on liquids? Give an example or counter example.
3. What does the word viscosity mean? (prior knowledge & chapter)
CW: Notes “PAP or REG 3.2” - Fluids, pressure, Bernoulli’s Principle, etc.
QUIZ next Wednesday on the small unit of study...
Your group has until April 8th to have converted your iMovie into a movie and dropped in my IN BOX to not lose any points. You will need to work on this at lunch, before school, or after school in the next couple of weeks.
HW REG: pg. 84 #1 AND pg. 86 #1-9 due TOMORROW. This is the first grade of the 9 weeks. Start out with 100%! (3 incomplete assignments will be write up in my class this 9 weeks. 1 day late may count up to 1/2 credit only in my class; other teachers may not give any.)
FIELD TRIP WEDNESDAY - Others will report to Coach Bock Room in Bldg. 18.
HW PAP: pg. 393 #1-9 due Tuesday AND pg. 397 #1-8 DUE FRIDAY.

3. 13.1 Fluid Pressure
Because the theater seat exerts a supporting force over a larger area, it is more comfortable than the bicycle seat.

4. How is pressure calculated?
13.1 Fluid Pressure
Pressure
How is pressure calculated?
To calculate pressure, divide the force by the area over which the force acts.

5. 13.1 Fluid Pressure
Pressure
Pressure is the result of a force distributed over an area. examples nail, sharp pencil, snow shoes
The unit of force is the newton (N).
The unit of area is the square meter (m2).
The SI unit of pressure is the pascal (Pa). A pascal is one newton per square meter (N/m2)
1 kPa = 1000 Pa

6. 13.1 Fluid Pressure
Pressure
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?

7. 13.1 Fluid Pressure
Pressure
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?

8. Fluids: Anything that Flows: Liquids, Gases, Plasma
13.1 Fluid Pressure
Pressure in Fluids
A fluid is a substance that assumes the shape of its container.
Both liquids and gases are fluids.
Water, oil, gasoline, air, and helium are examples of fluids.
Fluids: Anything that Flows: Liquids, Gases, Plasma

9. The direction of flow is always FROM high pressure
TO low pressure.
Low pressure
High pressure

10. How does water pressure change with depth?
13.1 Fluid Pressure
Pressure in Fluids
How does water pressure change with depth?
How is pressure distributed at a given level in a fluid?

11. 13.1 Fluid Pressure
Pressure in Fluids
Water pressure increases as depth increases. The pressure in a fluid at any given depth is constant, and it is exerted equally in all directions.

12. 13.1 Fluid Pressure
Pressure in Fluids
Particles in a liquid are tightly packed together but are able to slide past one another.

13. 13.1 Fluid Pressure
Pressure in Fluids
Particles in a gas are far apart and travel in straight lines until they collide with another particle or object.

14. 13.1 Fluid Pressure
Pressure in Fluids
Water in a glass is in contact with the walls and bottom of the glass, and it exerts pressure on these surfaces.
For a fluid that is not moving, depth and the type of fluid are the two factors that determine the pressure the fluid exerts.

15. 13.1 Fluid Pressure
Pressure in Fluids
Each vase holds a different amount of liquid. The liquid levels are all the same because pressure depends on depth, not amount.

16. 13.1 Fluid Pressure
Planetary Atmospheres
The layer of gases surrounding a planet is known as its atmosphere. All of the planets in our solar system have some form of atmosphere. The weight of an atmosphere creates atmospheric pressure at the planet’s surface.
The weight of the Earth’s atmosphere exerts a pressure of about 101 kPa (1 atm) at sea level.

17. 13.1 Fluid Pressure
Exploring Boiling Points of Chlorocarbons
Interpreting Tables Which planet listed in the table has the greatest atmospheric pressure?

18. 13.1 Fluid Pressure
Exploring Boiling Points of Chlorocarbons
Interpreting Tables Which planet listed in the table has the greatest atmospheric pressure?
Answer: Venus, 9120 kPa

19. 13.1 Fluid Pressure
Exploring Boiling Points of Chlorocarbons
Interpreting Tables What chemical substance exists in all but one of the atmospheres?

20. 13.1 Fluid Pressure
Exploring Boiling Points of Chlorocarbons
Interpreting Tables What chemical substance exists in all but one of the atmospheres?
Answer: Nitrogen

21. Exploring Boiling Points of Chlorocarbons
13.1 Fluid Pressure
Exploring Boiling Points of Chlorocarbons
Converting Units The bar is another unit of pressure (1 bar = kPa). Convert each of the given pressures into bars.

22. Exploring Boiling Points of Chlorocarbons
13.1 Fluid Pressure
Exploring Boiling Points of Chlorocarbons
Converting Units The bar is another unit of pressure (1 bar = kPa). Convert each of the given pressures into bars.
Answer: Mercury, 10–15 bar; Earth, 1 bar; Venus, 90.0 bar; Mars, bar

23. Exploring Boiling Points of Chlorocarbons
13.1 Fluid Pressure
Exploring Boiling Points of Chlorocarbons
Using Formulas How much force is exerted on a square-meter area of Venus’s surface?

24. Exploring Boiling Points of Chlorocarbons
13.1 Fluid Pressure
Exploring Boiling Points of Chlorocarbons
Using Formulas How much force is exerted on a square-meter area of Venus’s surface?
Answer: Pressure = Force/Area; Force = Pressure × Area;
Force = 9120 kPa × 2.00 m2 = 9.12 × 106 N/m2 × 2.00 m2 Force= = x 107 or rounded to sig. figure 2.00 × 107 N

25. Exploring Boiling Points of Chlorocarbons
13.1 Fluid Pressure
Exploring Boiling Points of Chlorocarbons
Predicting On which planet would a balloon filled with a given quantity of helium have the smallest volume?

26. Exploring Boiling Points of Chlorocarbons
13.1 Fluid Pressure
Exploring Boiling Points of Chlorocarbons
Predicting On which planet would a balloon filled with a given quantity of helium have the smallest volume?
Answer: The helium-filled balloon would have the smallest volume on Venus because Venus has the greatest atmospheric pressure.

27. Air Pressure and the Atmosphere
13.1 Fluid Pressure
Air Pressure and the Atmosphere
How does air pressure change with altitude?
Air pressure decreases as the altitude increases.

28. Air Pressure and the Atmosphere
13.1 Fluid Pressure
Air Pressure and the Atmosphere
Earth’s atmosphere exerts pressure of about 101 kPa at sea level. Why aren't you crushed by air pressure?

29. Air Pressure and the Atmosphere
13.1 Fluid Pressure
Air Pressure and the Atmosphere
Earth’s atmosphere exerts pressure of about 101 kPa at sea level. Why aren't you crushed by air pressure?
The pressure inside your body balances the air pressure outside. The balanced forces cancel, resulting in a net force of zero.

30. 13.1 Fluid Pressure
Why do your ears pop when you change altitude such as climbing a large mountain in a car or rising in an airplane? Why don’t your ear drums burst on the airplane?

31. 13.1 Fluid Pressure
Why do your ears pop when you change altitude such as climbing a large mountain in a car or rising in an airplane? Why don’t your ear drums burst on the airplane?
The outside pressure changes more quickly than your ear can adjust which creates a pressure difference in pressure. When unbalanced pressures equalize, popping sensation within a small tube occurs.

32. 13.1 Fluid Pressure
Why can an almost empty gasoline can in the garage be more dangerous than a full tank?

33. Air Pressure and the Atmosphere
13.1 Fluid Pressure
Air Pressure and the Atmosphere
A can containing a small amount of water is heated until the water boils. Then the can is capped. As the can cools, the pressure inside the can becomes less than the pressure outside the can. The difference in pressure crushes the can.

34. Air Pressure and the Atmosphere
13.1 Fluid Pressure
Air Pressure and the Atmosphere
A can containing a small amount of water is heated until the water boils. Then the can is capped. As the can cools, the pressure inside the can becomes less than the pressure outside the can. The difference in pressure crushes the can.

35. Air Pressure and the Atmosphere
13.1 Fluid Pressure
Air Pressure and the Atmosphere
A can containing a small amount of water is heated until the water boils. Then the can is capped. As the can cools, the pressure inside the can becomes less than the pressure outside the can. The difference in pressure crushes the can.

36. Air Pressure and the Atmosphere
13.1 Fluid Pressure
Air Pressure and the Atmosphere
A can containing a small amount of water is heated until the water boils. Then the can is capped. As the can cools, the pressure inside the can becomes less than the pressure outside the can. The difference in pressure crushes the can.

37. 13.1 Fluid Pressure
Assessment Questions
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?
3000 Pa
30,000 Pa
12 Pa
1200 Pa

38. 13.1 Fluid Pressure
Assessment Questions
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?
3000 Pa
30,000 Pa
12 Pa
1200 Pa ANS: B

39. The SI unit for pressure, equal to 1 N/m2, is called the
13.1 Fluid Pressure
Assessment Questions
The SI unit for pressure, equal to 1 N/m2, is called the
atmosphere.
foot-pound.
pascal.
watt.

40. The SI unit for pressure, equal to 1 N/m2, is called the
13.1 Fluid Pressure
Assessment Questions
The SI unit for pressure, equal to 1 N/m2, is called the
atmosphere.
foot-pound.
pascal.
watt. ANS: C

41. The pressure exerted by a stationary fluid is determined by
13.1 Fluid Pressure
Assessment Questions
The pressure exerted by a stationary fluid is determined by
the area of surface containing the fluid and the type of fluid.
the weight and volume of the fluid.
the type of fluid and its depth.
the shape of the container and the weight of the fluid.

42. The pressure exerted by a stationary fluid is determined by
13.1 Fluid Pressure
Assessment Questions
The pressure exerted by a stationary fluid is determined by
the area of surface containing the fluid and the type of fluid.
the weight and volume of the fluid.
the type of fluid and its depth.
the shape of the container and the weight of the fluid. ANS: C

43. Which of the following statements about fluid pressure is false?
Assessment Questions
Which of the following statements about fluid pressure is false?
Pressure increases as depth increases.
The pressure at a given depth is constant.
The pressure in a fluid is exerted downward.
Liquids and gases exert pressure.

44. Which of the following statements about fluid pressure is false?
Assessment Questions
Which of the following statements about fluid pressure is false?
Pressure increases as depth increases.
The pressure at a given depth is constant.
The pressure in a fluid is exerted downward.
Liquids and gases exert pressure. ANS: C

45. 13.1 Fluid Pressure
Assessment Questions
Why do mountain climbers on very high peaks need cylinders of oxygen as they approach the summit?
The tops of the mountains extend out of the atmosphere.
The pressure of air decreases as altitude increases.
Air on the mountaintops is too cold to breathe.
Air pressure at high altitudes is too great for normal breathing.

46. 13.1 Fluid Pressure
Assessment Questions
Why do mountain climbers on very high peaks need cylinders of oxygen as they approach the summit?
The tops of the mountains extend out of the atmosphere.
The pressure of air decreases as altitude increases.
Air on the mountaintops is too cold to breathe.
Air pressure at high altitudes is too great for normal breathing. ANS: B

47. 13.1 Fluid Pressure
Assignments:
CW: Finish & turn in station labs today. (station 8, 10 exception)
CW: Finish pendulum lab and turn in.
CW: Work on creating your egg drop device today. If your materials are not here tomorrow, you will lose points for the group...
HW/CW: Complete the 12 problems handout that was given out on Monday which is due tomorrow... (work on class only if all labs are completed or if you do not have your group materials.)
Note to me:
Computer Quiz
Web code = cca-2120
check balloon lab in book pg
look for momentum lab...