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Wave equation in classical mechanics!

  1. Mar 30, 2016 #1
    My question is about equation of a wave which travells on a string.
    I have seen that we write wave function as y=f(x-vt) , but why did we select this function, why not any other like y=f(5x-9vt) .
    I also have a question why is there a negative sign why not positive sign, (for me positive one makes sense)

    Thank you for helping :)
  2. jcsd
  3. Mar 30, 2016 #2
    Welcome to PF! Please post your question in the appropriate forum.
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