### String Tension

The*tension*of a vibrating string is the

*force*used to stretch it. It is therefore directed along the axis of the string. A force must be applied at the endpoint on the right, and a force is applied at the endpoint on the left. Each point interior to the string is pulled equally to the left and right,

*i.e.*, the net force on an interior point is . (A nonzero force on a massless point would produce an infinite acceleration.)

If the cross-sectional area of the string is , then the tension is given by the stress on the string times .

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Non-Stiff String

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Young's Modulus