Moving Termination: Ideal String

Moving rigid termination for an ideal string.

• Left endpoint moved at velocity $v_0$
• External force $f_0 = Rv_0$
• $R=\sqrt{K\epsilon }$ is the wave impedance (for transverse waves)
• Relevant to bowed strings (when bow pulls string)
• String moves with speed $v_0$ or 0 only
• String is always one or two straight segments
• ``Helmholtz corner'' (slope discontinuity) shuttles back and forth at speed $c = \sqrt{K/\epsilon }$