Abstract
The conditions of contact interaction (pressure, displacement, temperature) of the surfaces of machine parts as the basis for their design and improvement are considered. It is noted that physics is the theoretical basis of the mechanics of interaction of surfaces. A structural hierarchy of interaction types is proposed. The place of mechanical interaction among known to science four types of interaction is defined: strong, weak, electromagnetic and gravitational. A hypothesis has been put forward and justified that in a given range of sizes, mechanical interaction can be considered the fifth interaction between the material objects of the world
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