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26 Cards in this Set
 Front
 Back
Fluids

Liquids + gases


Density

mass/volume


Specific gravity

density of substance/density of water


Density of water

1000 kg/m^3


Pressure

force/area, force acting perpendicular to the surface


Units of pressure

Pa, pascal


Hydrostatic gauge pressure

p gauuge = density fluid * g * depth


P total

P on surface + P gauge


Buoyant force

Net upward force on the object in fluid


Archimedes Principle

The strength of the buoyant force is equal to the weight of the fluid displaced by the object
F = density * volume * g 

Object will float if

density of object < density of fluid


Object will sink if

density of object> density of fluid


Pasxals Law

F1/A1 = F2/A2


Flow rate

f = Av, how much fluid flows per unit time
A  cross sectional area v  average speed of flow 

Flow speed

How fast fluid moving


Continuity Equation

A1v1 = A2V2


If the tube narrows, speed will

increase


if the tube widens speed will

decrease


Conditions for ideal fluid

1.incompressible
2.no friction (viscosity) 3.flow is smooth 4. flow rate is steady 

Bernoullis equation

P1 + 1/2 pv1^2 + pgy1 = P2 + 1/2 pv2^2 + pgy2
p  density y height 

Stress

force/area


Is stress same as pressure

no, force in stress equation doesnt have to be perpendicular to the surface as in pressure


Strain

CHange, change in length/original length


Hookes law

stress = modulus * strain


Tenison/compression

L = FL/EA, flea, E youngs modulus


Shear

X = FL/AG, flag
