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( Tension (physics))
In physics String Tension is the magnitude of the pulling force exerted by a string, cable, chain, or similar object on another object. Tension is measured Newtons (kgm/s2) and is always parallel to the string on which it applies. There are two basic possibilities for systems of objects held by strings.[1] Either acceleration is zero and the system is therefore in equilibrium or there is acceleration and therefore a net force is present. Note that a string is assumed to have negligible mass. A system is in equilibrium when the sum of all forces is zero. For example consider a system consisting of an object that is being lowered vertically by a string with tension, T, at a constant velocity. The system has a constant velocity and is therefore in equilibrium because the tension in the string (which is pulling up on the object) is equal to the force of gravity, mg, which is pulling down on the object. (Assume up is positive and down is negative.) A system has a net force when an unbalanced force is exerted on it. An equivalent statement is the sum of all forces is not zero. Acceleration and net force always exist together.
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