Wave on a string general theory

AI Thread Summary
The discussion centers on analyzing the motion of points on a wave traveling along a string. The user initially identifies points A and D as instantaneously at rest, B and C as moving downward, and E and F as moving upward. However, they are confused about the correct motion of points B, C, E, and F, particularly why B is moving upward and E downward. Additionally, they express uncertainty regarding which points have the greatest and least accelerations, speculating that C has the greatest and F the least. Clarification on these points is sought to better understand wave motion dynamics.
ObviousManiac
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Homework Statement


Screenshot2012-02-22at65311PM.png


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.

Homework Equations


N/A


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.
 
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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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