= Massless inextensible string
= Ideal string
{synonym}
= Light inextensible string
{synonym}
An ideal string of negligible <mass> and fixed length, transmitting <tension> when taut. In an ideal guide with no <friction>, the <tension> magnitude is the same on both sides: otherwise the <force> balance on an arbitrarily short massless segment would fail. Its fixed length gives a <mechanical constraint> relating the endpoint <velocities>. The two endpoint <tension> <powers> sum to zero when the guide is stationary; the string can transfer <energy> between connected particles without adding net <energy>.
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