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Low velocity impact craters in sand

  1. Jul 25, 2007 #1
    Hi, i am working on a high school project on how various factors (mass, height and sand particle size) affect crater diameter.

    I am struggling to find a solid hypothesis/ theory on this question. I have found out that the cube of the diameter is proportional to the KE of the ball, but i am struggling to find justification of this with physical thoery.

    For example why is the energy of the ball proportional to the volume of the material excavated on impact?
     
  2. jcsd
  3. Jul 25, 2007 #2

    mgb_phys

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    Think where the energy of the ball goes.
    It must lift the material it hits.
    The mass of material lifted is proportional to what?
     
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