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CHAPTER 3 FORCES AND PRESSURE

Form 4

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Pressure

• Pressure is defined as the force

per unit area.Pressure, P = F / A

• Pressure in liquids, P = h ρg 

A = area of base

h = depth of base

g = gravitational field

strength

ρ = density of liquid

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Pascal’s principle

• Pascal’s Principle states that in a confined

fluid, an externally applied pressure istransmitted uniformly in all directions.

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Archimedes’ Principle• Archimedes’ Principle states that an object,

whether completely or partially immersed in a

fluid, is acted on by a buoyant force, which isequal to the weight of the displaced fluid.

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Bernoulli’s Principle

• Bernoulli's Principle states that in a steady

flow of fluid, the pressure decreases when thevelocity of the fluid increases and the

.

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   1   B  2   A  3   C

   4 . i .   B

 i i   B

 i i i   C

 i  v   D

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   5   B

   6   B

   7   A 

   8   D    9

   C

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   1   4   B   1  5   C   1   6   B   1   7   D