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B Stick-Slip with Chalk

  1. May 21, 2016 #1
    What is the physics behind drawing dotted lines with chalk with just one stroke?
    This is a video demonstrating this:


    Here is what I currently have:
    stickslip.png
    as soon as the applied force exceeds that of the frictional, the block will accelerate. What makes it slip though? Because there is a jerk (change in acceleration) due to the difference between static and kinetic frictional forces?
     
  2. jcsd
  3. May 21, 2016 #2

    Andy Resnick

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    2016 Award

    I don't think it's stick-slip behavior, it seems to be more complicated (a "frictional impact oscillator"):

    http://www.mate.tue.nl/mate/pdfs/2323.pdf
     
  4. Jun 1, 2016 #3
    can't do that on a dry erase board....just sayin'
     
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