Raztezanje

Raztezanje, in English stretching or elongation, is the increase in length of an object under the action of a force. In physics and engineering, raztezanje ΔL is the difference between the final length and the original length L0. Relative raztezanje, or strain, is ε = ΔL / L0, a dimensionless quantity that describes how much an object deforms per unit length.

Under tensile loading, raztezanje arises from the stretching of a material’s atomic bonds. In the elastic region the relationship is approximately linear and can be described by Hooke’s law ΔL = (F L0) / (A E), where F is the applied force, A the cross-sectional area, and E the Young’s modulus. When the material yields, raztezanje becomes plastic and is not fully recoverable. In materials testing, properties such as plastic elongation at fracture and percent elongation after fracture are used, for example elongation at break = (ΔL at fracture / L0) × 100%.

In medicine and exercise, raztezanje refers to the stretching of muscles and connective tissue. Proper raztezanje can improve flexibility, range of motion, and blood flow, and is commonly used in warm-ups and physical therapy. Safe practice emphasizes gradual, controlled movements and attention to individual limits to prevent injury.

In everyday language, raztezanje can also describe the extension of objects, budgets, or timelines, referring to the lengthening of a period, space, or supply.