1. QUICK WRITE Why is the electricity produced at the bottom of dams? When you catch a deep-sea fish, why does its eyes pop-out? Why do your ears pop on an airplane or up in the mountains?

2. Forces in Fluids Chapter 11 Notes

10. 1 atmosphere = 760 mmHg = 29.92 inHg = 14.7 lb/in2 = 101.3 KPa

13. Very Low pressure Higher Pressure The whole system is a low pressure, but it dramatically decreases towards the eye of the hurricane. Pressure always flows from high to low, which creates the high velocity winds.

24. 4 N .002m2 20m 1. What is the pressure of the left piston? 2. What is the pressure of the right Piston? 2000Pa P= F/a = 4/.002 = 2000Pa 3. What is the total force of the right Piston? 40,000N F=Pa= 2000N/m2 x 20m2 =

26. ARCHIMEDE’S PRINCIPLE

27. Buoyancy The tendency or ability of an object to float.

29. Buoyant Force The upward force exerted by a fluid on a submerged or floating object.

31. DO EXPERIMENT 1

34. Archimedes' Principle Hmm! The crown seems lighter under water! The buoyant force on a submerged object is equal to the weight of the liquid displaced by the object. For water, with a density of one gram per cubic centimeter, this provides a convenient way to determine the volume of an irregularly shaped object and then to determine its density

41. DENSITY OF WATER 1g/cm ³

43. Bernoulli's Principle

47. Bernoulli’s and Baseball A non-spinning baseball or a stationary baseball in an airstream exhibits symmetric flow. A baseball which is thrown with spin will curve because one side of the ball will experience a reduced pressure. This is commonly interpreted as an application of the Bernoulli principle . The roughness of the ball's surface and the laces on the ball are important! With a perfectly smooth ball you would not get enough interaction with the air.

48. Bernoulli’s and Air Foil The air across the top of a conventional airfoil experiences constricted flow lines and increased air speed relative to the wing. This causes a decrease in pressure on the top according to the Bernoulli equation and provides a lift force. Aerodynamicists (see Eastlake) use the Bernoulli model to correlate with pressure measurements made in wind tunnels, and assert that when pressure measurements are made at multiple locations around the airfoil and summed, they do agree reasonably with the observed lift.

54. ρ = mass/volume = fluid density g = acceleration of gravity h =height or depth of fluid MORE EQUATIONS!!! Liquid Pressure = ρgh where…..

55. Fluid Pressure =  gh = 1000Kg/m³ x 9.8m/s² x 1m = 9,800 Pa Fluid Pressure =  gh = 1000Kg/m³ x 9.8m/s² x 3m = 29,400 Pa The pressure from the weight of a column of liquid of area A and height h is The most remarkable thing about this expression is what it does not include. The fluid pressure at a given depth does not depend upon the total mass or total volume of the liquid. The above pressure expression is easy to see for the straight, unobstructed column, but not obvious for the cases of different geometry which are shown.