1. Day 1

2. Fluids Particles are free to move past each other Gases and liquids

3. Why do things feel lighter when they are under water?

4. Buoyant Force Upward force on submerged objects Opposite gravity

5. Lower Pressure Higher Pressure Pressure differences create F B

6. Sink or Float? Depends on the net force

7. Archimedes Principle F B = weight of fluid displaced

8. Method 1: In formula form: F B =  Vg

9. Method 2: F B = Actual weight – Apparent weight

10. Method 3: For floating objects: F B = weight of object

11. Practice Problems

12. Archimedes’ Principle Lab

13. Day 2

14. To Find F B for your boat… 1. F B = Fg 1. F B = Fg 2. F B =  Vg 2. F B =  Vg

15. Imagine…driving in the mountains or flying in an airplane…what happens to your ears?

17. Pressure Force per unit area P = F/A Pascal (Pa) = N/m 2 Or atmosphere (atm)

18. At sea level… Air pressure is 1.01 x 10 5 Pascals 1 atmosphere

19. Pressure Problems #1

20. Pascal’s Principle Pressure is equally transmitted to all parts of the fluid and the container Think toothpaste…

21. Pascal’s Principle Hydraulic systems P 1 = P 2 Example

22. Pressure Problems #4

23. Pressure varies with… DepthDensityGravity P =  gh

24. Calculating Absolute (or Total) Pressure P = P 0 +  gh

25. Pressure Problem #6

26. Pressure Lab

27. Day 3

28. Magic Paper Hold a piece of notebook paper just under your lower lip and blow across it. What do you observe?

29. Bernoulli’s Principle The pressure in a fluid decreases as the fluid’s velocity increases.

30. Why? PE + KE + P = PE + KE +P (Law of Conservation of Energy)

31. Animation

32. Airplane wings generate lift because…