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Homework Help: Vibrations and waves

  1. May 27, 2003 #1

    Dx

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    I am curious to know that if a mass on a spring undergoes SHM. when the mass is at its MAX displacement from equilibrium, its instantaneous velocity is what?
    is it zero!

    can someone explain?
    Dx :wink:
     
  2. jcsd
  3. May 27, 2003 #2

    enigma

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    Well, just before the mass hits the max displacement, the velocity is +deltaV, and just after it is -deltaV. You have to go through zero to get from + to -.
     
  4. May 27, 2003 #3

    Dx

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    Okay!

    Dx scratches his head.
    I said at MAX displacement that deltav is + or - Max but my teacher says im wrong. It must be less than max but not zero as youve kinda explained, i think
    Dx :wink:

    Right?
     
  5. May 27, 2003 #4

    Tom Mattson

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    You had it right the first time: The speed at the extrema of position is zero.

    If you are moving this way ----->
    and then this way <-----

    then at some point you had to stop and turn around.
     
  6. May 28, 2003 #5

    Dx

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    Kool

    Hello,

    Thanks!
    Dx :wink:
     
    Last edited by a moderator: May 28, 2003
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