Noun

(-)

The rubbing of one object or surface against another.

* {{quote-magazine, year=2013, month=July-August, author=(Henry Petroski)

, title= Geothermal Energy , volume=101, issue=4, magazine=(American Scientist) , passage=Energy has seldom been found where we need it when we want it. Ancient nomads, wishing to ward off the evening chill and enjoy a meal around a campfire, had to collect wood and then spend time and effort coaxing the heat of friction out from between sticks to kindle a flame.}}

Conflict, as between persons having dissimilar ideas or interests; clash.

(physics): A force that resists the relative motion or tendency to such motion of two bodies in contact.

* 1839 , (Denison Olmsted), A Compendium of Astronomy Page 95

Secondly, When a body is once in motion it will continue to move forever, unless something stops it. When a ball is struck on the surface of the earth, the friction of the earth and the resistance of the air soon stop its motion.

Noun

(en noun)

Condition of being held in a state between two or more forces, which are acting in opposition to each other

Psychological state of being tense.

(physics, engineering) State of an elastic object which is stretched in a way which increases its length.

(physics, engineering) Force transmitted through a rope, string, cable, or similar object (used with prepositions on'', ''in'', or ''of , e.g., "The tension in the cable is 1000 N", to convey that the same magnitude of force applies to objects attached to both ends).

(physics, engineering) Voltage. Usually only the terms low tension, high tension, and extra-high tension, and the abbreviations LT, HT, and EHT are used. They are not precisely defined; LT is normally a few volts, HT a few hundreds of volts, and EHT thousands of volts.