FLUID PRESSURE

Ch. 13.1

True False Statement True False

Pressure equals area/ force, and is measured in Pascals

Pressure in a fluid increases as depth increases

Air pressure decreases as altitude increases

All liquids have the same density

Depth and size of the container determine the pressure of a fluid

PRESSURE The result of force distributed over an

area

PRESSURE

P- pascal, Pa1kPa = 1000 Pa

F- N A- m2

A box with a weight of 2700 N rests on the ground. If the area of the box touching the ground is 1.5 square meters, what is the pressure on the ground?

Given:

Formula

Plug and Chug

PRESSURE IN FLUIDS Fluid- substance assumes shape of

container Pressure increases as depth increases Pressure at any given depth is constant,

and exerts equally in all directions

Depends upon depth, and type of fluid

AIR PRESSURE & ATMOSPHERE Air pressure decreases as the altitude

increases101 kPa at sea level

Ex: Air plane, ridding up Mountains

FORCES & PRESSURE

Ch 13.2

True False Statement True False

Bernoulli’s Principle says, as the speed of a fluid increases, the pressure within

decreases

Lift allows birds, and planes to fly-creating an upward force

Pascal’s Principle says pressure in a fluid is greater at the source of pressure

Hydraulic systems work due to Bernoulli’s Principle

Spray bottles demonstrate Pascal’s Principle

TRANSMITTING PRESSUREPascal’s Principle Hydraulic Systems

A change in pressure at any point in a fluid is transmitted equally and unchanged in all directions throughout the fluid

Uses pressurized fluid acting on pistons to change force

Increases output force is produced due to a constant fluid pressure is exerted on the larger area of the output pistonHydraulic Clip

Hydraulic Car

BERNOULLI’S PRINCIPLE As the speed of a fluid increases, the

pressure within the fluid decreasesBernoulli's Clip

BERNOULLI’S PRINCIPLEWings and Lift Spray Bottles

Lift- pressure difference between top and bottom of wings creating an upward force

Birds, airplanes

Fast moving water creates low pressure at the top of the tube

Flight

BUOYANCYCh 13.3

True False Statement True False

Buoyancy results in the apparent weight gain of an object

An object less dense than the liquid will float

Archimedes's principle says the buoyant force of an object is equal to the weight

of fluid displaced by the object

An object with greater density than the liquid will sink

An object with the same density of the liquid will float

BUOYANT FORCES Buoyancy- ability of a fluid to exert an

upward force on an object placed in it

Results in the apparent loss of weight of an object in a fluid

Upward force, acts opposite of gravity

ARCHIMEDES'S PRINCIPLE Buoyant force on

an object is equal to the weight of the fluid displaced by the object

DENSITY AND BUOYANCY If object is less

dense than the fluid, it will float

If it is more dense, it will sink

If buoyant force is equal in weight, an object will float

If it is less than the weight it will sink

DENSITY AND BUOYANCY Suspended

Object has same density as the fluid it is in

SinkingObjects density is

greater than the fluid it is in

FloatingObject has less

density than the fluid it is in