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- DictionaryFric·tion/ˈfrikSH(ə)n/
noun
- 1. the resistance that one surface or object encounters when moving over another: "a lubrication system that reduces friction"
noun
Force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other
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. Friction can have dramatic consequences, as illustrated by the use of friction created by rubbing pieces of wood together to start a fire. Kinetic energy is converted to thermal energy whenever m... Wikipedia