PressurePressure

Pressure_Pressure_: The force exerted on a surface divided : The force exerted on a surface divided by the total area over which the force is exerted by the total area over which the force is exerted (PSI or Pa)(PSI or Pa)

P = F ÷ A: (P = pressure, F = force, A = area) P = F ÷ A: (P = pressure, F = force, A = area)

Ex: 100 lb ÷ 20 in2 = 5 PSIEx: 100 lb ÷ 20 in2 = 5 PSI

Pascal (Pa): a unit of measure for Pascal (Pa): a unit of measure for pressurepressure. Pa = . Pa =

1N/m1N/m22 Bill Nye: PressureBill Nye: Pressure

Mud shoes-4:20; vacuum-:16; water rocket-10:31; water pressure/dam-15:31; water jet-15:48Mud shoes-4:20; vacuum-:16; water rocket-10:31; water pressure/dam-15:31; water jet-15:48

Air Pressure pushes equally in all directions. At sea level it is 14.7 PSI

As elevation increases, air pressure decreases. Water pressure increases with increases in depth.

Mariana Trench: 7 miles down, 8 tons per square inch pressure

Bernoulli’s Principle: The rule that a stream of Bernoulli’s Principle: The rule that a stream of fast-moving fluid exerts fast-moving fluid exerts lessless pressure than the pressure than the surrounding fluid.surrounding fluid.

If air moves faster above the object, pressure If air moves faster above the object, pressure pushes the object pushes the object upup..

If air moves faster below the object, If air moves faster below the object, pressure pushes the object pressure pushes the object downdown..

The object always moves The object always moves

towardtoward the the

low pressure low pressure

area.area.

How an airplane flies video

Bouyant Force (buoyancy): The Bouyant Force (buoyancy): The upwardupward force force exerted by a fluid on an objectexerted by a fluid on an object

Bill Nye: BuoyancyBill Nye: Buoyancy

Archimedes-2:08Archimedes-2:08

Float-8:00Float-8:00

Neut.Buoyancy-13:38Neut.Buoyancy-13:38

DensityDensity: The mass of a : The mass of a substance contained in a substance contained in a unit of volume (D=m/v) unit of volume (D=m/v)

(D = density, m = mass, (D = density, m = mass,

v = volume)v = volume)

ex: 50g/5cm3 = 10g/cm3ex: 50g/5cm3 = 10g/cm3

10g/5ml = 2g/ml10g/5ml = 2g/ml

density video clip

Archimedes’s Principle: The rule that the Archimedes’s Principle: The rule that the buoyant force on an object is buoyant force on an object is equalequal to the to the weight of the fluid displaced by that objectweight of the fluid displaced by that object

Conceptual Physics: Demo of Archimedes' principle - YouTube

Pascal’s Principle: The rule that when Pascal’s Principle: The rule that when force is applied to a confined fluid, the force is applied to a confined fluid, the increase in pressure is transmitted increase in pressure is transmitted equallyequally to all parts of the fluid.to all parts of the fluid.

Hydraulics & Force Pumps: fluid is Hydraulics & Force Pumps: fluid is transmitted & transmitted & multipliedmultiplied on the other end. on the other end.