- freight train
- freighter
- french curve
- freon
- frequency
- frequency analysis
- frequency analyzer
- frequency changer
- frequency characteristic
- frequency converter
- frequency distribution curve
- frequency equation
- frequency meter
- frequency modulation
- frequency range
- frequency response
- fresh water
- fret saw
- fretting corrosion
- friability
- friction
- friction angle
- friction brake
- friction clutch
- friction coefficient
- friction cone
- friction coupling
- friction damper
- friction disk
- friction drive
- friction drum
- friction gearing
- friction hammer
- friction heat
- friction loss
- friction material
- friction of motion
- friction of rest
- friction press
- friction pulley
- friction resistance
- friction saw
- friction sawing
- friction screw press
- friction shock absorber
- friction spring
- friction surface
- friction torque
- friction welding
- friction wheel