# tension (mechanics)

Tension is a reaction force applied by a stretched string (rope or a similar object) on the objects which stretch it. The direction of the force of tension is parallel to the string, towards the string.

Because tension is a type of force, it has the same units as any force: kg m/s², or N.

Tension exists also inside the string itself: if the string is considered to be composed of two parts, tension is the force which the two parts of the string apply on each other. The amount of tension in the string determines whether it will break, as well as its vibrational properties, which are used in musical instruments.

The magnitude of the force of tension typically increases with the amount of stretching. For small stretching, the force is often described by Hooke's law.

String-like objects in relativistic theories, such as the strings used in some models of interactions between quarks, or those used in the modern string theory, also possess tension. These strings are analyzed in terms of their world sheet, and the energy is then typically proportional to the length of the string. As a result, the tension in such strings is independent of the amount of stretching.

Action and the other the Reaction (actio et reactio in Latin). Both forces are equal in magnitude and opposite in direction. The distinction between action and reaction is purely arbitrary: anyone of the two forces can be considered an action, in which case the
rope (IPA: /rəʊp/) is a length of fibers, twisted or braided together to improve strength for pulling and connecting. It has tensile strength but is too flexible to provide compressive strength (i.e.
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## Definition

A newton
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Tensile strength , or measures the force required to pull something such as rope, wire, or a structural beam to the point where it breaks.

## Explanation

A string is the vibrating element which is the source of vibration in string instruments, such as the guitar, harp, piano, and members of the violin family. They are lengths of a flexible material kept under tension so that they may freely vibrate.