Coupling of elastic and gravitational force

gravitational force

gravitational force field

Specific effort per gravitational force

vacuum and gravitational force

anchor line force

force line

in line force

in-line force

mooring line force

police force line

Double line-line voltage control

line-line extreme distance

line-line topological relation in traffic network

on-line line loss

loss-free line (=lossless line =lossless transmission line)

SDSL Single-Line Digital Subscriber Line，Single-Line DSL

action force and reaction force

applied electromotive force {= applied EMF}; impressed electromotive force