Fluid Mechanics Flashcards
What are the names of the two types of forces exerted by a fluid?
Buoyancy
Dynamic
Define buoancy
an objects ability or tendency to float
Define density
The mass/volume ratio of an object
What is the equation for density?
m/V
Define buoyancy force
The difference between the force acting upwards and the force acting downwards
what is the Siri equation
%body fat = (521/body density)-478
is buoyancy present with or with out movement?
without
When do dynamic forces occur?
when an object is moving through a fluid
What components is dynamic force split into? (2)
Lift
Drag
what are the key drag forces? (2)
Form
Surface
what is form drag caused by?
Impact forces from the collisions between the object and the fluid molecules
What is surface drag caused by?
Frictional forces acting between the fluid molecules and the surface of the object
What is the equation for dynamic fluid force?
Fd=pa(v)^2
What is the density of;
a) water
b) air
a) 1gcm^-3
b) 0.001gcm^-3
What is relative velocity?
The measurement of velocity between 2 objects
