Define "tension" in mechanical terms.

In mechanical terms, tension refers to a force that acts to stretch an object. This force is transmitted through an object, such as a rope, cable, or beam, when it is pulled from opposite ends. Tension is typically directed along the length of the object and arises when the ends of the material are pulled apart, creating an internal force that resists that stretching.

This concept is crucial in many engineering applications, particularly when analyzing structures under loads, as it helps engineers understand how materials will behave under different conditions. For instance, in a hanging cable or a bridge, understanding how tension works is essential for ensuring the structure can safely support various loads without failing.

The other choices describe different forces or phenomena that do not relate directly to the stretching effect that is characteristic of tension.