Sum the friction terms for each element from which the friction results, including pipe lengths, elbows, flanges, fitting, valves, etc to get a total friction value K-total.

When input to the Bernoulli equation the friction loss will be:

ef=0.5*Ktotal*V^2
where ef is the energy lost to friction
Ktotal is sum of all the loss coefficients
V= velocity of fluid

The friction loss coefficient for a length of pipe is:

Kpipe= 16*f*L/D

where
Kpipe= pipe loss coefficient
L= length of pipe
D= diameter of pipe
f=the Darcy friction factor (not to be confused with the similar Fanning friction factor)

For turbulent flow the Darcy friction factor can be obtained from a Moody diagram (very simple) or via the Colebrook or Churchill equations (complex). For laminar flow:

f= 64/Re
where Re is the Reynold's number, an indication of turbulence.

Turbulent flow occurs at Reynolds numbers greater than about 2000.

Be wary of whether the f listed is the Fanning or Darcy friction factor: mechanical engineers use Darcy, chemical engineers typically use Fanning.

The Hooper 2K method can be used to calculate pipe loss coefficients.

See related links for a calculation form.

Friction Interaction is a push or pull factor of your object rubbing against the ground.

Yes. Friction is always a factor. It is partly through drag, which can be thought of as friction, that the wind in a tornado is able to cause damage.

• limiting friction is force of friction when a body slides over the surface of another body

Dakota Fanning's father is Steve Fanning.