Friction
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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding or grinding against each other. Types of friction include dry, fluid, lubricated, ski
Simulated blocks with fractal rough surfaces, exhibiting static frictional interactions
Fire making
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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.
Friction
…called tribology, and has a history of more than 2,000 years. Friction can have dramatic consequences, as illustrated by the use of friction created by rubbing pieces of wood together to start a fire. Another important consequence of many types of friction can be wear, which may lead to performance degradation or damage to components. It is known…
Typical contents of a tinder box. From left to right: flint, fire striker, char cloth and piece of mushroom.
Maasai warrior lighting a fire, blowing on it to add oxygen that encourages the fire to spread
A fire plough (left), as opposed to a hand drill (right)
Firesteel and flint used in Dalarna, Sweden in 1916.