Deutsch: Reibung / Español: Fricción / Português: Atrito / Français: Frottement / Italiano: Attrito

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

Deutsch: Faktor / Español: Factor - Factor / Français: Facteur - Facteur / Italiano: Fattori - Fattori

A factor, a Latin word meaning may refer to a sun protection factor, a unit describing reduction in transmitted ultraviolet light and in technology a profession that focuses on how people interact with products, tools, or procedures.

Deutsch: Fuse / Español: FUSE / Français: Fuse

In an industrial or manufacturing context, "fuse" refers to a safety device that is used to protect electrical systems from damage due to overloading or short-circuiting. A fuse works by breaking an electrical circuit if the current flowing through the circuit exceeds a specified limit, thus preventing damage to the electrical components.

Deutsch: Fitting
Fitting can refer to a dress fitting. or any machine component, piping or tubing part that can attach or connect two or more larger parts. For examples, see coupling, compression fitting, piping and plumbing fittings and pipe fitting.

In the industrial and industry context, a fixture refers to a device or piece of equipment that is used to securely hold, support, or position a workpiece during manufacturing processes such as machining, assembly, or inspection. Fixtures are designed to hold the workpiece in a specific position and orientation, allowing for consistent and accurate processing.

Deutsch: Frequenz / Español: Frecuencia / Português: Frequéncia / Français: Frêquence / Italiano: Frequenza
Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency. The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency.

Deutsch: Fabrik / Español: Fábrica / Português: Fábrica / Français: Usine / Italiano: Fabbrica
A factory (previously manufactory) or manufacturing plant is an industrial site, usually consisting of buildings and machinery, or more commonly a complex having several buildings, where workers manufacture goods or operate machines processing one product into another.

Deutsch: Fell / Español: Pelaje / Français: Fourrure
Fur is a synonym for hair, used in reference to non-human animals, usually mammals, particularly those with extensive body hair coverage. The term is sometimes used to refer to the body hair of an animal as a complete coat, also known as the "pelage".