Teaching Physics with the Physics Suite

Edward F. Redish

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Displacement and velocity patterns in waves

The graphs below may represent either a picture of the shape of a wave on a string at a particular instant in time, t1, or the transverse (up and down) velocity of the mass points of that string at that time. Depending on what they are, the wave on the string may be: 

  1. a right going traveling wave 
  2. a left going traveling wave 
  3. a part of a standing wave growing in amplitude at time t1 
  4. a part of a standing wave shrinking in amplitude at time t1  
For each of the following cases, decide what the wave is doing and choose one of the four letters (a)-(d). 

  1. Graph A is a graph of the string's shape and graph B is a graph of the string's velocity.
  2. Graph A is a graph of both the string's shape and the string's velocity. 
  3. Graph B is a graph of the string's shape and graph A is a graph of the string's velocity. 

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Page last modified October 23, 2002: O08