Fluids Flashcards
what is the purpose of specific gravity
we will understand the proportion of the object that will be submerged in that liquid e.g. oil instead of water
what is specific gravity
density of object (kg/m3)
___________________________
density of water (1000)
- no units because they cancel out
what is a fluid
anything that takes the shape of it’s container
in a system, is work in = work out
yes (Newton’s 3rd law_
what is the formula for pressure
P = F/A
where F = force, A = area
what is Pascal’s prinicple
is it about internal or external pressure
any external pressure on a container is distributed equally across the container
what is a Pa
pascal = N/m2
what is force down in a liquid context
F = m*g
where m = mass of liquid, and g = gravity
or F = pVg where we have substituted in density
what is the pressure in a fluid
P = p x h x g
where p = density, h = height, g = gravity
what is an atmosphere
103 000 Pa = 103 000 N/m2
what is buoyant force
the ability of an object to float because net force is positive e.g. pressure up > pressure down
what is archimedes principle
buoyant force = weight of fluid displaced
what is flux (eqn)
V/t in m3/s
what is laminar flow
frictionless flow
what is the equation of continuity
volume in = volume out e.g. A1v1 = A2v2
what is the formula for energy of a system
work in + potential energy + kinetic energy
what is the formula for work
F x d (distance)
or
P x m/ p
(pressure * mass)/ density for a fluid
what is the formula for volume given density and mass
V = m/p
what would exert more pressure in a container? a gas or a liquid? why?
gas because it’s particles are more spread out
what is the formula for UPWARD buoyant force
F = -pgV
