rostogolire

Rostogolire is the act or process of rolling, defined as the motion of an object that rotates about an axis while translating along a surface. The term comes from the Romanian verb a rostogoli, meaning to roll or tumble.

In physics, rostogolire describes rolling motion where a body moves without slipping, so the point of contact with the surface is momentarily at rest. The relation v = ωr applies, linking translational speed v, angular speed ω, and radius r.

In engineering and manufacturing, rostogolire refers to rolling processes in which material is shaped through contact with rollers, as in rolling mills to reduce thickness or alter cross-section. In everyday use, the word also covers the common act of rolling an object along the ground, such as a ball, wheel, or log.

Characteristics of rostogolire include friction, rolling resistance, and sometimes slipping if the contact condition is violated. The outcome depends on surface texture, material, and load.

Etymology and usage: the noun is formed from a rostogoli- root with the -ire suffix; cognate forms exist in related Romance languages. In Romanian literature and technical writing, rostogolire appears in both technical and colloquial contexts.