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Wave on a string general theory

  1. Feb 22, 2012 #1
    1. The problem statement, all variables and given/known data

    The figure shows a wave on a string moving to the right. For each of the points indicated on the string, A-F, state whether it is moving:
    I. upward,
    II. downward,
    III. instantaneously at rest.

    2. Relevant equations

    3. The attempt at a solution
    I got A and D as (III), B and C as (II), and E F as (I).

    According to the answer, my B-C and E-F is mixed up, but I'm not sure why. How is it moving upward at B? Downward at E? I'm sure I'm just missing something simple.
  2. jcsd
  3. Feb 22, 2012 #2
    Also, it asks "In the previous problem, which points have the greatest and least accelerations?"

    I'm kinda lost there, but my guess would be C (greatest?) and F (least?)
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