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Rotational motion inelastic collision

  1. Mar 22, 2013 #1
    1. The problem statement, all variables and given/known data

    A ball of clay of mass m travels with velocity v in a path tangent to a disk of radius R and mass M. The clay collides with the disk tangentially to its outer rim ( a totally inelastic collision) and the clay and disk begins to spin about the axis.
    a) What is the final angular speed of the clay and disk ( don't forget to include the mass m after the collision.
    b) if the clay had collided with the rim at an angle of 30° to the tangent line what would the final angular speed be then

    2. Relevant equations

    v'b=v'a
    va=v'acosθ+v'bcosθ

    3. The attempt at a solution

    a)
    mva=mv'acosθ+mv'bcosθ
    0=mv'asinθ+mv'bsinθ

    v'b=-va(sinθ/sin(-θ))
    v'a=v'b
    =va/2cosθ

    b) im not sure without knowinif the formula above is correct
     
  2. jcsd
  3. Mar 22, 2013 #2

    Simon Bridge

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    If you are unsure about a formula - try using physics.
    What are the laws that the motion has to follow?
     
  4. Mar 23, 2013 #3
    what do u mean? Newtons law?
     
  5. Mar 23, 2013 #4

    Simon Bridge

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    You know a whole bunch of physical laws besides Newton's ones.
    How many do you know that concern angular momentum and momentum?
     
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