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A Curious question About Ballistic Pendulum Solution

  1. Jan 18, 2015 #1

    terryds

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    I've watched a video about ballistic pendulum problems.
    The illustration is :
    5l9e28.jpg

    I wonder why the final energy is just a gravity potential energy.
    I think there is also a rotational kinetic energy (since it will rotate and oscillate)
    Is my thought wrong?
     
    terryds, Jan 18, 2015
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  3. Jan 18, 2015 #2

    Bystander

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    What's the rotational velocity at the "peak" of the pendulum displacement?
     
    Bystander, Jan 18, 2015
  4. Jan 18, 2015 #3

    terryds

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    I'm not quite sure. But, I think it will be v/r
    Am I right ?
     
    terryds, Jan 18, 2015
  5. Jan 18, 2015 #4

    Bystander

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    In your sketch, where the maximum displacement from the vertical is indicated to be sixty degrees, how fast is the pendulum moving?
     
    Bystander, Jan 18, 2015
  6. Jan 18, 2015 #5

    terryds

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    Do you mean the velocity ?
    I think it's 0 m/s since it has reached the amplitude.
    Oh yeah.. Thank you for your answer.
    I get it now.. Because the velocity is zero, so the rotational kinetic energy is zero !
     
    terryds, Jan 18, 2015
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