Behavior of Fluids Chapter 3 Section 2.

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Presentation transcript:

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

(P) pressure = (F) force ÷ (A) area 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 →  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 = P x A

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

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