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
a body immersed in fluid experiences an upthrust equal to the amount of the 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
