Friction

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, skin, and internal – an incomplete list. The study of the processes involved is called tribology, and has a history of more than 2,000 years.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

MECHKIT

Mechanical know-how, applied — fasteners, torque, tolerances, and the DIY mechanics toolkit.

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