Transcript Behavior of Fluids Chapter 3 Section 2 Reminder…Fluids • A substance that continually deforms (flows) under an applied stress • Includes liquids, gases, & plasmas.

Behavior of Fluids
Chapter 3
Section 2
Reminder…Fluids
• A substance that
continually deforms
(flows) under an
applied stress
• Includes liquids, gases,
& plasmas
Reminder…Force
A push or pull
Pressure
• force exerted on a surface divided by the area
where the force is exerted - the unit is Pa
(Pascal) or N/m2
• Formula:
P=F÷A
(P) pressure = (F) force ÷ (A) area
Pressure Example/Demo
Stand Up!
Atmospheric Pressure
• the force of air pushing
down on Earth
– we do not feel this
pressure b/c the
downward & upward
forces are equal
(Balanced Pressure)
• Figure 18 Page 120
• How does the picture to
the right demonstrate
air pressure?
Variations in Atmospheric Pressure
 altitude →
  altitude
pressure
→
 atmospheric
 atmospheric pressure
Pascal’s Principle
• Force is applied to a confined fluid, an
increase in pressure is equally distributed to
all parts of the fluid
P=F÷A
OR
F=PxA
Bernoulli’s Principle
 Speed →
 Pressure
Charles’ Law
 Temp →  Pressure
Boyle’s Law
 Volume →  Pressure
Pressure Summary

PRESSURE


force
area


temp.
speed


Volume
studying
Buoyant Force
• the upward force on an
object in a liquid
– due to greater pressure
at deeper depths (like
greater pressure at
lower altitudes)
• If buoyant force is > the
weight of an object, it
floats
• If buoyant force is < the
weight of an object, it
sinks
Archimedes' Principle
• The buoyant force on
an object is equal to the
weight of the fluid
displaced by the object