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A fire plough (or fire plow) is a
A fire plough (or fire plow) is a firelighting
Fire making, fire lighting or fire craft is the process of artificially starting a fire. It requires completing the fire triangle, usually by heating tinder above its autoignition temperature.
Fire is an essential tool for human survival and t ...
tool. In its simplest form, it is two sticks rubbed together. Rubbing produces friction
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. Types of friction include dry, fluid, lubricated, skin, and internal -- an incomplete list. The study of t ...
and heat
In thermodynamics, heat is energy in transfer between a thermodynamic system and its surroundings by such mechanisms as thermal conduction, electromagnetic radiation, and friction, which are microscopic in nature, involving sub-atomic, ato ...
, and eventually an ember. More advanced are "stick-and-groove" forms, which typically uses a V-shaped base piece of wood, and a "friction stick" as the activator.https://archive.org/download/popularsciencemo10newy/popularsciencemo10newy.pdf
The typical fire plough consists of a stick cut to a dull point, and a long piece of wood with a groove cut down its length. The point of the first piece is rubbed quickly through the groove of the second piece in a "plowing" motion, to produce hot dust that then becomes a coal. A split is often made down the length of the grooved piece, so that oxygen can flow freely to the coal/ember. Once hot enough, the coal is introduced to the tinder, more oxygen is added by blowing and the result is ignition.
References
Fire making {{tool-stub