Transcript Pressure and Gravity

Forces in Fluids
Chapter 13
Pressure
• The result of _______________
distributed over an ________________.
• Pressure =
• Measured in units called kilopascals (kPa)
Pressure and Gravity
• Due to the force of ________________, the
pressure of any fluid varies with its
_____________.
• Ex. The deeper you swim down in water, the
more pressure you feel on your ears.
• Ex. When flying in an airplane your ears
also feel the difference. This is due to a
decrease in pressure
Weight = 1
G
Weight = Layer 1 + Layer 2
R
A
Weight = Layer 1 + Layer 2 + Layer 3
V
I
Weight = L1 + L2 + L3 + L4
T
Y
Weight = L1 + L2 + L3 + L4 + L5
Weight = 1
G
Weight = Layer 1 + Layer 2
R
A
Weight = Layer 1 + Layer 2 + Layer 3
V
I
Weight = L1 + L2 + L3 + L4
T
Y
Weight = L1 + L2 + L3 + L4 + L5
___________________ Principle
• A change in _____________ at any point
in a fluid is transmitted _______________
in all directions.
_____________________ Principle
• As the ______________ of a fluid
increases, the pressure ______________.
• ________________– the pressure
difference between the top and bottom
layer of a wing
• This is what allows airplanes to fly.
________________________
• Buoyant Force – an overall force in the
___________________ direction and acts
against the ______________________
weight of the object.
• This is known as ____________________.
___________________ Principle
• The ________________ force on an
object is _________ to the weight of
the fluid displaced by the object.
• Shows the relationship between
________________ & ___________.
________________________
• The amount of fluid that is moved aside
due to an object being placed in the
____________.
–Ex. When you get into a bath tub the
water level rises. The amount of
water that rises is the
____________________ water.
A. ________________
B. ________________
C. ________________
Buoyancy and Density
• An object will __________ in a fluid if
the density of that object is __________
than the density of the fluid.
• Density =
• Density of water = 1g/cm3
• Density of wood = 0.8g/cm3
• Wood floats in water!
• Helium balloons float in air because
helium is less dense than air.
• Density of air = 0.00121 g/cm3
• Density of Helium = 0.000167 g/cm3